# Menu 5 − Regen Status

Mode: Regeneration

The point of common connection is at the interface between the system input components and the rest of the power system. The voltages and currents at this point can be measured as shown below. Either the measured values, or values estimated and measured within the converter, can be selected to give the d and q-axis components in the converter control reference frame.

Parameter | 05.001 Output Frequency
--- | ---
Short description | Supply frequency.
Mode | Regeneration
Minimum | -200.0 | Maximum | 200.0
Default |  | Units | Hz
Type | 32 Bit Volatile | Update Rate | 4ms write
Display Format | Standard | Decimal Places | 1
Coding | RO, FI, ND, NC, PT

The Output Frequency (05.001) is a measure of the supply frequency. If the frequency shown is positive it indicates that the supply phase sequence is U-V-W. If it is negative it indicates that the supply phase sequence is W-V-U.

Parameter | 05.002 Output Voltage
--- | ---
Short description | r.m.s. line to line voltage at the a.c. terminals.
Mode | Regeneration
Minimum | −VM_AC_VOLTAGE | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

Output Voltage (05.002) is the r.m.s. line to line voltage at the a.c. terminals of the converter.

Parameter | 05.003 Output Power
--- | ---
Short description | Power flowing from the supply to the converter.
Mode | Regeneration
Minimum | −VM_POWER | Maximum | VM_POWER
Default |  | Units | kW
Type | 32 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

Output Power (05.003) is calculated based on the measured currents and estimated voltages at the a.c. terminals of the converter. See Regen Sub-mode (01.003) for the polarity of this parameter.

Parameter | 05.004 High Resolution Frequency
--- | ---
Short description | High resolution frequency.
Mode | Regeneration
Minimum | -200.00 | Maximum | 200.00
Default |  | Units | Hz
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 2
Coding | RO, FI, ND, NC, PT

Output Frequency (05.001) has a resolution of 0.1Hz, but for some applications a higher resolution is required, and so High Resolution Frequency (05.004) is provided with a resolution of 0.01Hz. Both parameters have an update rate of 4ms, but a 16ms filter is included in the calculation of the value in High Resolution Frequency (05.004) to give a stable level in the parameter.

Parameter | 05.005 D.c. Bus Voltage
--- | ---
Short description | Displays the voltage across the d.c. terminals of the converter
Mode | Regeneration
Minimum | −VM_DC_VOLTAGE | Maximum | VM_DC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

D.c. Bus Voltage (05.005) is the measured voltage at the d.c. terminals of the converter.

Parameter | 05.007 Rated Current
--- | ---
Short description | Set to the rated current of the regen inductor
Mode | Regeneration
Minimum | −VM_RATED_CURRENT | Maximum | VM_RATED_CURRENT
Default | Default Current Rating | Units | A
Type | 32 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 3
Coding | RW, VM

Rated Current (05.007) is used to define rated operating conditions for regen inductor thermal protection. See Inductor Thermal Time Constant (04.015).

Parameter | 05.018 Maximum Switching Frequency
--- | ---
Short description | Maximum switching frequency used by the system.
Mode | Regeneration
Minimum | 0 | Maximum | VM_SWITCHING_FREQUENCY
Default | 1 | Units | kHz
Type | 8 Bit User Save | Update Rate |
Display Format | Standard | Decimal Places | 0
Coding | RW, TE, VM

Value | Text
0 | 2
1 | 3
2 | 4
3 | 6
4 | 8
5 | 12
6 | 16

Maximum Switching Frequency (05.018) should be set to the required PWM switching frequency. The converter operates at this frequency unless the inverter temperature becomes too hot. Under these conditions the switching frequency is reduced in an attempt to avoid tripping (see Auto-switching Frequency Change (05.035) ). The actual switching frequency is shown in Switching Frequency (05.037). The switching frequency has a direct effect on the sample rate for the current controllers (see Current Controller Kp Gain (04.013)). All other control tasks are at a fixed rate.

Parameter | 05.025 A.c. Filter Capacitance
--- | ---
Short description | Value of delta connected capacitor included in the a.c. filter.
Mode | Regeneration
Minimum | 0.0000 | Maximum | 0.5000
Default | 0.0000 | Units | mF
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 4
Coding | RW

Reactive current is required to supply the a.c. filter capacitors. This gives an offset between the reactive current at the converter terminals and the point of common connection. A.c. Filter Capacitance (05.025) can be used to define the filter capacitance so that the converter compensates for the capacitor current.This adjusts the reactive current reference to give a better relationship between the reactive power reference (Reactive Power Input kVAR (03.020)) or the reactive current reference (Reactive Current Reference (04.008)) and the actual reactive power and reactive current. It also adjusts the calculation of Grid VARs (Q) (01.002) to make this more accurate. This parameter modifies the reactive current reference in grid-connected mode only, but is used in the calculation of Grid VARs (Q) (01.002) in all grid modes. The filter capacitors are normally delta connected and this parameter should be set to the actual value of the delta connected capacitors.

Parameter | 05.026 No-load Power Offset
--- | ---
Short description | Defines the power at the converter terminals for zero power reference.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_POWER
Default | 0.000 | Units | kW
Type | 32 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 3
Coding | RW, VM

There can be an offset in the estimated power at the converter output due to losses in the regen inductor etc. which can be removed using this parameter. In grid-connected mode the offset is added to Power Input kW (03.018). The offset is also removed from the calculated grid power (Grid Power (P) (01.001)) in all modes. If the d.c. link is not controlled by an external supply the required value can be estimated by operating in grid-connected mode with no-load applied to the d.c. link and using the inverse of the value shown in Output Power (05.003). If the d.c. link is controlled by an external supply the value can be estimated by operating in grid-forming mode with the regen inductor and filter present but not connected to a grid supply. Again the inverse of the value shown in Output Power (05.003) should be used. Note that the offset changes with switching frequency, and so the value for the required switching frequency must be used. This parameter is affected by Regen Sub-mode (01.003).

Parameter | 05.035 Auto-switching Frequency Change
--- | ---
Short description | Defines auto-switching frequency control with thermal model
Mode | Regeneration
Minimum | 0 | Maximum | 2
Default | 0 | Units |
Type | 8 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 0
Coding | RW, TE

Value | Text
0 | Enabled
1 | Disabled
2 | No Ripple Detect

The inverter can be damaged if the temperature is too high. The inverter can also be damaged or the lifetime of the power devices reduced, if the temperature ripple of the devices is too high. Auto-switching Frequency Change (05.035) defines the action taken if the drive inverter becomes too hot or the temperature ripple becomes too high. The inverter temperature is provided in Inverter Temperature (07.034).

Enabled:
If the inverter becomes too hot or the ripple temperature is higher than the level defined by Maximum Inverter Temperature Ripple (05.039) the switching frequency is reduced in an attempt to prevent tripping.

Disabled:
The switching frequency is not reduced, and so the drive will trip on OHt Inverter.100 if the inverter is too hot or the temperature ripple is too high.

No Ripple Detect:
The switching frequency is only reduced if the inverter temperature is too high. If the temperature ripple exceeds the level defined by Maximum Inverter Temperature Ripple (05.039) then the switching frequency is not reduced and the drive will trip on OHt Inverter.100.

The switching frequency is changed in steps defined by Auto-switching Frequency Step Size (05.036). For example with a switching frequency of 16kHz and a step size of two, the frequency will be reduced to 8kHz, then 4kHz etc. Minimum Switching Frequency (05.038) defines the minimum switching frequency that the system will attempt to use. If the switching frequency needs to switch to a lower level, then the drive will trip on OHt Inverter.100. If Minimum Switching Frequency (05.038) is changed the new value will only become active when Switching Frequency (05.037) is at or above the minimum value.

Parameter | 05.036 Auto-switching Frequency Step Size
--- | ---
Short description | Auto-switching frequency reduction step size
Mode | Regeneration
Minimum | 1 | Maximum | 2
Default | 2 | Units |
Type | 8 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 0
Coding | RW

See Auto-switching Frequency Change (05.035).

Parameter | 05.037 Switching Frequency
--- | ---
Short description | Displays the current switching frequency used by the drive
Mode | Regeneration
Minimum | 0 | Maximum | 6
Default |  | Units | kHz
Type | 8 Bit Volatile | Update Rate | Background write
Display Format | Standard | Decimal Places | 0
Coding | RO, TE, ND, NC, PT

Value | Text
0 | 2
1 | 3
2 | 4
3 | 6
4 | 8
5 | 12
6 | 16

Shows the actual inverter switching frequency after the auto-change function.

Parameter | 05.038 Minimum Switching Frequency
--- | ---
Short description | Minimum Switching Frequency
Mode | Regeneration
Minimum | 0 | Maximum | VM_MIN_SWITCHING_FREQUENCY
Default | 1 | Units | kHz
Type | 8 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW, TE, VM

Value | Text
0 | 2
1 | 3
2 | 4
3 | 6
4 | 8
5 | 12
6 | 16

See Auto-switching Frequency Change (05.035).

Parameter | 05.039 Maximum Inverter Temperature Ripple
--- | ---
Short description | Maximum Inverter Temperature Ripple
Mode | Regeneration
Minimum | 20 | Maximum | 60
Default | 60 | Units | °C
Type | 8 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW

Maximum Inverter Temperature Ripple (05.039) defines the maximum inverter temperature ripple which the drive uses to manage the inverter stage temperature. On reaching the maximum inverter temperature ripple the drive will reduce its switching frequency using Maximum Switching Frequency (05.018), Minimum Switching Frequency (05.038) and Auto-switching Frequency Step Size (05.036) where allowable. If the drive is unable to reduce its switching frequency and the temperature continues to exceed the maximum inverter temperature ripple a OHt Inverter.100 trip will be generated. See Auto-switching Frequency Change (05.035).

Parameter | 05.050 Phase Voltage Input Select
--- | ---
Short description | Selects the phase voltages as the measured input voltages instead of the line voltages.
Mode | Regeneration
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 1 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW

Measured voltage feedback is intended to be the voltages at the point of common connection. This can be measured using a transformer or voltage isolators, fed into the system via three analogue inputs and routed to Input Voltage 1 (05.051) to Input Voltage 3 (05.053). Either phase or line voltages can be used where Vu or Vuv are fed into Input Voltage 1 (05.051), Vv or Vvw are fed into Input Voltage 2 (05.052) and Vw or Vwu are fed into Input Voltage 3 (05.053). Phase Voltage Input Select (05.050) should be set correctly to indicate whether line or phase voltages are being measured. If phase voltages are measured the system derives the line voltages, and if line voltages are measured the system derives the phase voltages.

If the analogue input scaling is left at its default value of unity, then Input Voltage 1 (05.051) to Input Voltage 3 (05.053) will show +/-100% for +/-10V at the inputs and Voltage Feedback Ratio (05.056) can be set up to the ratio of the feedback devices being used to correctly convert the measured inputs to instantaneous Volts. The instantaneous measured voltages can be monitored in Vuv or Vu (05.064) to Vwu or Vw (05.066). Either the phase or line voltages can be selected with Phase Voltage Monitor (05.063). If the analogue input scaling is changed from 1.000 the ratio in Voltage Feedback Ratio (05.056) must be changed to include the scaling, i.e. Voltage Feedback Ratio (05.056) = Voltage feedback ratio x Analogue input scaling.

Parameter | 05.051 Input Voltage 1
--- | ---
Short description | Measured input voltage 1.
Mode | Regeneration
Minimum | -100.00 | Maximum | 100.00
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | 250us Read
Display Format | Standard | Decimal Places | 2
Coding | RW, ND, NC

See Phase Voltage Input Select (05.050).

Parameter | 05.052 Input Voltage 2
--- | ---
Short description | Measured input voltage 2.
Mode | Regeneration
Minimum | -100.00 | Maximum | 100.00
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | 250us Read
Display Format | Standard | Decimal Places | 2
Coding | RW, ND, NC

See Phase Voltage Input Select (05.050).

Parameter | 05.053 Input Voltage 3
--- | ---
Short description | Measured line voltage 3.
Mode | Regeneration
Minimum | -100.00 | Maximum | 100.00
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | 250us Read
Display Format | Standard | Decimal Places | 2
Coding | RW, ND, NC

See Phase Voltage Input Select (05.050).

Parameter | 05.056 Voltage Feedback Ratio
--- | ---
Short description | Voltage ratio between the measured voltage and the signal at the analogue input.
Mode | Regeneration
Minimum | 1.0 | Maximum | 1000.0
Default | 100.0 | Units |
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 1
Coding | RW

This parameter should give the ratio between the voltage being measured and the voltage connected to the analogue input. For example if a 40:1 transformer is used, then this parameter should be set to 40.0. The system is then set up automatically assuming that the analogue input scaling has been left at the default of unity. If the scaling is changed then this ratio must include the scaling. See Phase Voltage Input Select (05.050).

Parameter | 05.057 Voltage Feedback Phase Shift
--- | ---
Short description | Phase shift between the line voltages and the measured voltage fed into the analogue inputs.
Mode | Regeneration
Minimum | -180 | Maximum | 179
Default | 0 | Units | °
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW

This should give the phase shift between the line voltages and the measured signals at the analogue inputs. The phase is assumed to be the delay between the voltages and the measured signal (i.e., positive if the measured values lag the actual voltages or negative if the measured values lead the actual voltages).

Parameter | 05.063 Phase Voltage Monitor
--- | ---
Short description | Selects the phase voltages to monitor instead of the line voltages.
Mode | Regeneration
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 1 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW

If this parameter is set to zero Vuv or Vu (05.064) to Vwu or Vw (05.066) show line voltages, otherwise they show phase voltages.

Parameter | 05.064 Vuv or Vu
--- | ---
Short description | Instantaneous UV line voltage or U phase voltage.
Mode | Regeneration
Minimum | -1500 | Maximum | 1500
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 0
Coding | RO, ND, NC, PT

Shows the instantaneous level of the measured value of Vuv or Vu as selected with Phase Voltage Monitor (05.063).

Parameter | 05.065 Vvw or Vv
--- | ---
Short description | Instantaneous VW line voltage or V phase voltage.
Mode | Regeneration
Minimum | -1500 | Maximum | 1500
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 0
Coding | RO, ND, NC, PT

Shows the instantaneous level of the measured value of Vvw or Vv as selected with Phase Voltage Monitor (05.063).

Parameter | 05.066 Vwu or Vw
--- | ---
Short description | Instantaneous WU line voltage or W phase voltage.
Mode | Regeneration
Minimum | -1500 | Maximum | 1500
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 0
Coding | RO, ND, NC, PT

Shows the instantaneous level of the measured value of Vwu or Vw as selected with Phase Voltage Monitor (05.063).

Parameter | 05.067 Vu r.m.s.
--- | ---
Short description | R.m.s. U-phase voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

U-phase voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.068 Vv r.m.s.
--- | ---
Short description | R.m.s. V-phase voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

V-phase voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.069 Vw r.m.s.
--- | ---
Short description | R.m.s. W-phase voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

W-phase voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.070 Vuv r.m.s.
--- | ---
Short description | R.m.s. UV line voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

UV-line voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.071 Vvw r.m.s.
--- | ---
Short description | R.m.s. VW line voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

VW-line voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.072 Vwu r.m.s.
--- | ---
Short description | R.m.s. WU line voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

WU-line voltage in r.m.s. volts. The r.m.s. phase and line voltages are calculated and updated after each supply frequency period.

Parameter | 05.074 Grid Frequency
--- | ---
Short description | Measured grid frequency.
Mode | Regeneration
Minimum | -200.00 | Maximum | 200.00
Default |  | Units | Hz
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 2
Coding | RO, FI, ND, NC, PT

Shows the frequency of the grid calculated from the measured voltages. The measurement includes a 16ms filter and is updated every 4ms. The following actions are taken if there is a fault:

1. If the feedback is disconnected the measured frequency is forced to zero to prevent a spurious disaplay of frequency. To achieve this the frequency is displayed as zero if the measured voltage is 25Vrms or less.
2. If phase-loss occurs the grid voltage phasor stops rotating. The measurement system will continue to measure the grid frequency but it is no longer possible to determine the phase sequence. If the phase sequence was positive before the fault the frequency will continue to be shown as positive. If the phase sequence was negative it may continue to be negative or change to positive.

Parameter | 05.076 Input Voltage 1 Trim
--- | ---
Short description | Voltage trim to improve voltage feedback accuracy.
Mode | Regeneration
Minimum | 0.9000 | Maximum | 1.1000
Default | 1.0000 | Units |
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 4
Coding | RW

The accuracy of the measured voltage feedback can be improved to be better than the +/-2% of full-scale quoted in the drive user guide by measuring the voltage at the point where the feedback is taken and comparing it with the values given in the corresponding r.m.s. value parameter. The gain for each measurement can then be trimmed using the corresponding trim parameter. The accuracy is then dominated by the thermal drift in the analogue input system which is better than 1.2% of full-scale over the full temperature range of the drive. To achieve the minimum variation with temperature, the drive control board should be approximately 50°C during the trimming process. (Control board thermistor 1 can be selected to give the control board temperature.) This should limit the drift to +/-0.6% of full-scale over the full temperature range of the drive.

Parameter | 05.077 Input Voltage 2 Trim
--- | ---
Short description | Voltage trim to improve voltage feedback accuracy.
Mode | Regeneration
Minimum | 0.9000 | Maximum | 1.1000
Default | 1.0000 | Units |
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 4
Coding | RW

See Input Voltage 1 Trim (05.076).

Parameter | 05.078 Input Voltage 3 Trim
--- | ---
Short description | Voltage trim to improve voltage feedback accuracy.
Mode | Regeneration
Minimum | 0.9000 | Maximum | 1.1000
Default | 1.0000 | Units |
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 4
Coding | RW

See Input Voltage 1 Trim (05.076).

Parameter | 05.080 Vpos
--- | ---
Short description | Measured positive phase sequence voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, VM, ND, NC, PT

The measured phase voltages, or the phase voltages calculated from the line voltages are used to calculate the symmetrical components of the measured grid voltages. Vpos (05.080) and Vneg (05.081) give the positive and negative phase sequence components respectively scaled as r.m.s. line voltages.

Parameter | 05.081 Vneg
--- | ---
Short description | Measured negative phase sequence voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, VM, ND, NC, PT

See Vpos (05.080).

Parameter | 05.082 Measured Grid Voltage
--- | ---
Short description | Magnitude of the measured voltage phasor.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 2ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

The instantaneous magnitude of the voltage phasor created from the measured voltages scaled as a line voltage in r.m.s. Volts.

Parameter | 05.085 Voltage Feedback Select
--- | ---
Short description | Selects the voltage at output of the converter or the measured voltage at the point of common connection as the voltage feedback.
Mode | Regeneration
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 8 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW, TE

Value | Text
0 | Converter Output
1 | Measured Grid

Selects the voltage feedback used to derive Vd (05.086) and Vq (05.087). These are the selected voltages separated into d and q-axis components in a reference frame aligned with the voltage produced at the converter terminals. These values are used in each grid mode as follows.

Grid Mode (01.010) | Uses of measured voltage feedback
Grid Connected Mode | Grid power and reactive power calculation. Conversion of power and reactive power references to current references.
Grid Forming Mode or grid-supporting mode | Grid power and reactive power calculation. Voltage feedback for the voltage controllers.

Parameter | 05.086 Vd
--- | ---
Short description | d-axis component of the selected voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

The magnitude of the voltage component in the d-axis of the converter control reference frame scaled into r.m.s. line volts.

Parameter | 05.087 Vq
--- | ---
Short description | q-axis component of the selected voltage.
Mode | Regeneration
Minimum | 0 | Maximum | VM_AC_VOLTAGE
Default |  | Units | V
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 0
Coding | RO, FI, VM, ND, NC, PT

The magnitude of the voltage component in the q-axis of the converter control reference frame scaled into r.m.s. line volts.

Parameter | 05.091 Input Current 1
--- | ---
Short description | Measured input current Iu.
Mode | Regeneration
Minimum | -100.00 | Maximum | 100.00
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | 250us Read
Display Format | Standard | Decimal Places | 2
Coding | RO, ND, NC

Measured phase current feedback from the point of common connection can be provided using two current transducers. It is assumed the currents are balanced so the third current can be calculated. These should be fed into two analogue inputs and routed to Input Current 1 (05.091) and Input Current 2 (05.092).

If the analogue input scaling is left at its default value of unity, then Input Current 1 (05.091) and Input Current 2 (05.092) will show +/-100% for +/-10V at the inputs and Current Feedback Ratio (05.094) can be set up to the ratio of the feedback devices in Amps/Volt to correctly convert the measured inputs to instantaneous Amps. The instantaneous measured currents in Amps can be monitored in Iu (05.096) to Iw (05.098). If the analogue input scaling is changed from 1.000 the ratio in Current Feedback Ratio (05.094) must be changed to include the scaling, i.e. Current Feedback Ratio (05.094) = Current feedback ratio x Analogue input scaling.

Parameter | 05.092 Input Current 2
--- | ---
Short description | Measured input current Iv.
Mode | Regeneration
Minimum | -100.00 | Maximum | 100.00
Default |  | Units | %
Type | 16 Bit Volatile | Update Rate | 250us Read
Display Format | Standard | Decimal Places | 2
Coding | RO, ND, NC

See Input Current 1 (05.091).

Parameter | 05.094 Current Feedback Ratio
--- | ---
Short description | Ratio between the phase currents and the voltages at the analogue inputs.
Mode | Regeneration
Minimum | 0.01 | Maximum | 1000.00
Default | 10.00 | Units |
Type | 32 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 2
Coding | RW

This parameter should give the ratio between the current being measured and the voltage connected to the analogue input in Amps/Volt. For example if a transducer is used which gives 4V for a current of 50A, then this parameter should be set to 12.50 Amps/Volt. The system is then set up automatically assuming that the analogue input scaling has been left at the default of unity. If the scaling is changed then this ratio must include the scaling. See Input Current 1 (05.091).

Parameter | 05.095 Current Feedback Phase Shift
--- | ---
Short description | Phase shift between the phase currents and the voltages at the analogue inputs.
Mode | Regeneration
Minimum | -180 | Maximum | 179
Default | 0 | Units | °
Type | 16 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW

This should give the phase shift between the phase currents and the measured signals at the analogue inputs. The phase is assumed to be the delay between the currents and the measured signals (i.e., positive if the measured values lag the actual currents or negative if the measured values lead the actual currents).

Parameter | 05.096 Iu
--- | ---
Short description | Instantaneous Iu.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT_PEAK
Default |  | Units | A
Type | 32 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 3
Coding | RO, VM, ND, NC, PT

Shows the instantaneous level of Iu in Amps.

Parameter | 05.097 Iv
--- | ---
Short description | Instantaneous Iv.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT_PEAK
Default |  | Units | A
Type | 32 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 3
Coding | RO, VM, ND, NC, PT

Shows the instantaneous level of Iv in Amps.

Parameter | 05.098 Iw
--- | ---
Short description | Instantaneous Iw.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT_PEAK
Default |  | Units | A
Type | 32 Bit Volatile | Update Rate | 250us Write
Display Format | Standard | Decimal Places | 3
Coding | RO, VM, ND, NC, PT

Shows the instantaneous level of Iw in Amps.

Parameter | 05.099 Iu r.m.s.
--- | ---
Short description | R.m.s. U-phase Current.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT
Default |  | Units | A
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

Shows the r.m.s. level of Iu in Amps.

Parameter | 05.100 Iv r.m.s.
--- | ---
Short description | R.m.s. V-phase Current.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT
Default |  | Units | A
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

Shows the r.m.s. level of Iv in Amps.

Parameter | 05.101 Iw r.m.s.
--- | ---
Short description | R.m.s. W-phase Current.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT
Default |  | Units | A
Type | 16 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

Shows the r.m.s. level of Iw in Amps.

Parameter | 05.103 Current Feedback Select
--- | ---
Short description | Selects the current at the output of the converter or the measured current at the point of common connection as the current feedback.
Mode | Regeneration
Minimum | 0 | Maximum | 1
Default | 0 | Units |
Type | 8 Bit User Save | Update Rate | Background Read
Display Format | Standard | Decimal Places | 0
Coding | RW, TE

Value | Text
0 | Converter Output
1 | Measured Grid

Selects the current feedback used to derive Id (05.104) and Iq (05.105). These are the selected currents separated into d and q-axis components in a reference frame aligned with the voltage produced at the converter terminals. These values are used for the grid power and VARs calculations.

Parameter | 05.104 Id
--- | ---
Short description | d-axis component of current.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT
Default |  | Units | A
Type | 32 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

The magnitude of the current component in the d-axis of the converter control reference frame scaled into r.m.s. Amps.

Parameter | 05.105 Iq
--- | ---
Short description | q-axis component of current.
Mode | Regeneration
Minimum | 0.000 | Maximum | VM_DRIVE_CURRENT
Default |  | Units | A
Type | 32 Bit Volatile | Update Rate | 4ms Write
Display Format | Standard | Decimal Places | 3
Coding | RO, FI, VM, ND, NC, PT

The magnitude of the current component in the q-axis of the converter control reference frame scaled into r.m.s. Amps.