Variable Minimum / Maximum Pairs

The descriptions below define the variable minimum/maximum pairs that can be used with parameters when the VM format bit is set. The variable minimum and maximum themselves can be dependent on other parameters, or the drive rating or other conditions as defined. The variable minimum and the variable maximum have a limited range and this is defined for each minimum/maximum pair.

Identifier VM_AC_VOLTAGE
Description Range applied to parameters showing a.c. voltage
Units V
Range of [MIN] 0
Range of [MAX] 0 to 930

VM_AC_VOLTAGE[MAX] in drive voltage rating dependent. See the table below.

Voltage level 200V 400V 575V (1) 690V (2)
VM_AC_VOLTAGE[MAX] 325 650 780 930

(1) Frame size 5 and above only

(2) Frame size 7 and above only

VM_AC_VOLTAGE[MIN] = 0


Identifier VM_AC_VOLTAGE_SET
Description Range applied to a.c. voltage set-up parameters
Units V
Range of [MIN] 0
Range of [MAX] 0 to 765

VM_AC_VOLTAGE_SET[MAX] is drive voltage rating dependent. See the table below.

Voltage level 200V 400V 575V 690V
VM_AC_VOLTAGE_SET[MAX] frame size 1 to 4 240 480 N/A N/A
VM_AC_VOLTAGE_SET[MAX] frame size 5 to 6 265 530 635 N/A
VM_AC_VOLTAGE_SET[MAX] frame size 7 to 9 265 530 635 765
VM_AC_VOLTAGE_SET[MAX] Commander ID 240 480 N/A N/A

VM_AC_VOLTAGE_SET[MIN] = 0


Identifier VM_ACCEL_RATE
Description Maximum applied to the ramp rate parameters
Units s/100Hz, s/MaxFrequency
Range of [MIN] 0.0
Range of [MAX] 0.0 to 32000.0

A maximum needs to be applied to the ramp rate parameters because the units are a time for a change of speed from zero to a defined level or to maximum speed. If the change of speed is to the maximum speed then changing the maximum speed changes the actual ramp rate for a given ramp rate parameter value. The variable maximum calculation ensures that longest ramp rate (parameter at its maximum value) is not slower than the rate with the defined level, i.e. 32000.0 s/100Hz. 
The maximum frequency is taken from Maximum Reference Clamp (01.006) if Select Motor 2 Parameters (11.045) = 0, or M2 Maximum Reference Clamp (21.001) if Select Motor 2 Parameters (11.045) = 1.

VM_ACCEL_RATE[MIN] = 0.0

If Ramp Rate Units (02.039) = 0:
VM_ACCEL_RATE[MAX] = 32000.0
Otherwise:
VM_ACCEL_RATE[MAX] = 32000.0 x Maximum frequency / 100.00

Note - Parameter 11.045 is only available on drives with support for Motor 2 parameters..


Identifier VM_DC_VOLTAGE
Description Range applied to d.c. voltage parameters
Units V
Range of [MIN] 0
Range of [MAX] 0 to 1190

VM_DC_VOLTAGE[MAX] is the full scale d.c. link voltage feedback for the drive. This level is drive voltage rating dependent. See the table below.

Voltage level 200V 400V 575V 690V
VM_DC_VOLTAGE[MAX] frame size 1 to 4 510 870 N/A N/A
VM_DC_VOLTAGE[MAX] frame size 5 to 6 415 830 990 N/A
VM_DC_VOLTAGE[MAX] frame size 7 to 9 415 830 990 1190
VM_DC_VOLTAGE[MAX] Commander ID 440 990 N/A N/A

VM_DC_VOLTAGE[MIN] = 0


Identifier VM_DC_VOLTAGE_SET
Description Range applied to d.c. voltage reference parameters
Units V
Range of [MIN] 0
Range of [MAX] 0 to 1150

VM_DC_VOLTAGE_SET[MAX] is drive voltage rating dependent. All values are shown in the table below.

Voltage level 200V 400V 575V 690V
VM_DC_VOLTAGE_SET[MAX] frame size 1 to 4 400 800 N/A N/A
VM_DC_VOLTAGE_SET[MAX] frame size 5 to 6 400 800 955 N/A
VM_DC_VOLTAGE_SET[MAX] frame size 7 to 9 400 800 995 1150
VM_DC_VOLTAGE_SET[MAX] Commander ID 415 900 N/A N/A

VM_DC_VOLTAGE_SET[MIN] = 0


Identifier VM_DRIVE_CURRENT
Description Range applied to parameters showing current in A
Units A
Range of [MIN] -9999.99 to 0.00
Range of [MAX] 0.00 to 9999.99

VM_DRIVE_CURRENT[MAX] is equivalent to the full scale (over current trip level) for the drive and is given by Full Scale Current Kc (11.061).

VM_DRIVE_CURRENT[MIN] = - VM_DRIVE_CURRENT[MAX]


Identifier VM_FREQ
Description Range applied to parameters showing frequency
Units Hz
Range of [MIN] -1100.00
Range of [MAX] 1100.00

This variable minimum/maximum defines the range of speed monitoring parameters. To allow headroom for overshoot the range is set to twice the range of the speed references.

VM_FREQ[MIN] = 2 x VM_SPEED_FREQ_REF[MIN]

VM_FREQ[MAX] = 2 x VM_SPEED_FREQ_REF[MAX]


Identifier VM_MAX_SWITCHING_FREQUENCY
Description Range applied to the maximum switching frequency parameters
Units User units
Range of [MIN] Open Loop: 0 (0.667kHz), RFC-A: 2 (2kHz)
Range of [MAX] 8 (16kHz)

VM_SWITCHING_FREQUENCY[MAX] = Power stage dependent

VM_SWITCHING_FREQUENCY[MIN] = 0

Note that RFC-A modes are not available on all drive types and so these settings are not applicable in this case.


Identifier VM_MOTOR1_CURRENT_LIMIT
Description Range applied to current limit parameters (motor 1)
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0

VM_MOTOR1_CURRENT_LIMIT[MIN] = 0.0

VM_MOTOR1_CURRENT_LIMIT[MAX] = (ITlimit / ITrated) x 100 %

Where:

ITlimit = Imax x cos(sin-1(IMrated / Imax))

IMrated = Pr 05.007 sin f

ITrated = Pr 05.007 x cos f

cos f= Pr 05.010

Imax is (Overload x Pr 11.061 / 2.2) when the motor rated current set in Pr 05.007 is less than or equal to Pr 11.032 (i.e. Heavy duty), otherwise it is the lower of (Overload x Pr 11.061 / 2.2) or 1.1 x Pr 11.060 (i.e. Normal Duty).

Overload = 1.75 for Open Loop mode and 1.8 for RFCA mode (is not available on all drives).


Identifier VM_MOTOR2_CURRENT_LIMIT
Description Range applied to current limit parameters (motor 2)
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0

VM_MOTOR2_CURRENT_LIMIT[MAX] is dependent on the drive rating and motor set-up parameters.

VM_MOTOR2_CURRENT_LIMIT[MIN] = 0.0

Refer to VM_MOTOR1_CURRENT_LIMIT for description.

Note - Parameter 11.045 is only available on drives with support for Motor 2 parameters.


Identifier VM_NEGATIVE_REF_CLAMP1
Description Limits applied to the negative frequency clamp (motor 1)
Units Hz
Range of [MIN] -550.00 to 0.00
Range of [MAX] 0.00 to 550.00


This variable maximum/minimum defines the range of the negative frequency clamp associated with motor map 1 (Minimum Reference Clamp (01.007)). The minimum and maximum are affected by the settings of the Negative Reference Clamp Enable (01.008), Bipolar Reference Enable (01.010) and Maximum Reference Clamp (01.006) as shown in the table below.

Negative Reference Clamp Enable (01.008) Bipolar Reference Enable (01.010) VM_NEGATIVE_REF_CLAMP1[MIN] VM_NEGATIVE_REF_CLAMP1[MAX]
0 0 0.00 Pr 01.006
0 1 0.00 0.00
1 X -VM_POSITIVE_REF_CLAMP[MAX] 0.00


Identifier VM_NEGATIVE_REF_CLAMP2
Description Limits applied to the negative frequency clamp (motor 2)
Units Hz
Range of [MIN] -550.00 to 0.00
Range of [MAX] 0.00 to 550.00

This variable maximum/minimum defines the range of the negative frequency clamp associated with motor map 2 (M2 Minimum Reference Clamp (21.002)). It is defined in the same way as VM_NEGATIVE_REF_CLAMP1 except that the M2 Maximum Reference Clamp (21.001) is used instead of Maximum Reference Clamp (01.006).

Note - Parameter 11.045  is only available on drives with support for Motor 2 parameters.


Identifier VM_POSITIVE_REF_CLAMP
Description Limits applied to the positive frequency reference clamp
Units Hz
Range of [MIN] 0.00
Range of [MAX] 550.00

VM_POSITIVE_REF_CLAMP[MAX] defines the range of the positive reference clamps, Maximum Reference Clamp (01.006) and M2 Maximum Reference Clamp (21.001), which in turn limits the references.

Note - Parameter 11.045 is only available on drives with support for Motor 2 parameters.

This value is model dependent.


Identifier VM_POWER
Description Range applied to parameters that either set or display power
Units kW
Range of [MIN] -9999.99 to 0.00
Range of [MAX] 0.00 to 9999.99

VM_POWER[MAX] is rating dependent and is chosen to allow for the maximum power that can be output by the drive with maximum a.c. output voltage, at maximum controlled current and unity power factor.

VM_POWER[MAX] = √3 x VM_AC_VOLTAGE[MAX] x VM_DRIVE_CURRENT[MAX] / 1000

VM_POWER[MIN] = -VM_POWER[MAX]


Identifier VM_RATED_CURRENT
Description Range applied to rated current parameters
Units A
Range of [MIN] 0.00
Range of [MAX] 0.00 to 9999.99

VM_RATED_CURRENT [MAX] = Maximum Rated Current (11.060) and is dependent on the drive rating.

VM_RATED_CURRENT [MIN] = 0.00


Identifier VM_SPEED_FREQ_REF
Description Range applied to the frequency reference parameters
Units Hz
Range of [MIN] -550.00 to 0.00
Range of [MAX] 0.00 to 550.00

This variable minimum/maximum is applied throughout the frequency and speed reference system so that the references can vary in the range from the minimum to maximum clamps.

Negative Reference Clamp Enable (01.008) VM_SPEED_FREQ_REF[MAX] if Select Motor 2 Parameters (11.045) = 0 VM_SPEED_FREQ_REF[MAX] if Select Motor 2 Parameters (11.045) = 1
0 Maximum Reference Clamp (01.006) M2 Maximum Reference Clamp (21.001)
1 Maximum Reference Clamp (01.006) or |Minimum Reference Clamp (01.007)| whichever the larger M2 Maximum Reference Clamp (21.001) or |M2 Minimum Reference Clamp (21.002)| whichever the larger

VM_SPEED_FREQ_REF[MIN] = -VM_SPEED_FREQ_REF[MAX].

Note - Parameter 11.045 is only available on drives with support for Motor 2 parameters.


Identifier VM_SPEED_FREQ_REF_UNIPOLAR
Description Unipolar version of VM_SPEED_FREQ_REF
Units Hz
Range of [MIN] 0.00
Range of [MAX] 0.00 to 550.00

VM_SPEED_FREQ_REF_UNIPOLAR[MAX] = VM_SPEED_FREQ_REF[MAX]

VM_SPEED_FREQ_REF_UNIPOLAR[MIN] = 0.00


Identifier VM_SPEED_FREQ_USER_REFS
Description Range applied to analogue reference parameters
Units Hz
Range of [MIN] -550.00 to 550.00
Range of [MAX] 0.00 to 550.00

This variable maximum is applied to Analogue Reference 1 (01.036), Analogue Reference 2 (01.037) and Keypad Reference (01.017).

The maximum applied to these parameters is the same as other frequency reference parameters.

VM_SPEED_FREQ_USER_REFS [MAX] = VM_SPEED_FREQ_REF[MAX]

However the minimum is dependent on Negative Reference Clamp Enable (01.008) and Bipolar Reference Enable (01.010).

Negative Reference Clamp Enable (01.008) Bipolar Reference Enable (01.010) VM_SPEED_FREQ_USER_REFS[MIN]
0 0 If Select Motor 2 Parameters (11.045) = 0 Minimum Reference Clamp (01.007), otherwise M2 Minimum Reference Clamp (21.002)
0 1 -VM_SPEED_FREQ_REF[MAX]
1 0 0.00
1 1 -VM_SPEED_FREQ_REF[MAX]

Note - Parameter 11.045 is is only available on drives with support for Motor 2 parameters.


Identifier VM_SUPPLY_LOSS_LEVEL
Description Range applied to the supply loss threshold
Units V
Range of [MIN] 0 to 1150
Range of [MAX] 0 to 1150

VM_SUPPLY_LOSS_LEVEL[MAX] = VM_DC_VOLTAGE_SET[MAX]

VM_SUPPLY_LOSS_LEVEL[MIN] is drive voltage rating dependent. See the table below.

Voltage level 200V 400V 575V (1) 690V (2)
VM_SUPPLY_LOSS_LEVEL[MIN] 205 410 540 540

(1) Frame size 5 and above only

(2) Frame size 7 and above only


Identifier VM_TORQUE_CURRENT
Description Range applied to torque and torque producing current parameters.
Units %
Range of [MIN] -1000.0 to 0.0
Range of [MAX] 0.0 to 1000.0

Select Motor 2 Parameters (11.045) VM_TORQUE_CURRENT[MAX]
0 VM_MOTOR1_CURRENT_LIMIT[MAX]
1 VM_MOTOR2_CURRENT_LIMIT[MAX]

VM_TORQUE_CURRENT[MIN] = -VM_TORQUE_CURRENT[MAX]


Identifier VM_TORQUE_CURRENT_UNIPOLAR
Description Unipolar version of VM_TORQUE_CURRENT
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0

VM_TORQUE_CURRENT_UNIPOLAR[MAX] = VM_TORQUE_CURRENT[MAX]

VM_TORQUE_CURRENT_UNIPOLAR[MIN] =0.0


Identifier VM_USER_CURRENT
Description Range applied to torque reference and percentage load parameters
Units %
Range of [MIN] -1000.0 to 0.0
Range of [MAX] 0.0 to 1000.0

VM_USER_CURRENT[MAX] = User Current Maximum Scaling (04.024)

VM_USER_CURRENT[MIN] = -VM_USER_CURRENT[MAX]