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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 191
Issue Number: 1
An additional limit is applied to ensure that the drive output frequency cannot exceed 550 Hz. For Open-loop mode, an additional limit of 550 Hz is
applied directly. For RFC modes the variable maximum is applied to the speed reference, and an additional limit of 550 x 60 / Motor pole pairs is applied.
VM_POWER Range applied to parameters that either set or display power
Units kW
Range of [MIN] -99999.999 to 0.000
Range of [MAX] 0.000 to 99999.999
Definition
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]
VM_RATED_CURRENT Range applied to rated current parameters
Units A
Range of [MIN] 0.000
Range of [MAX] 0.000 to 99999.999
Definition
VM_RATED_CURRENT [MAX] is dependent on the drive rating.
VM_RATED_CURRENT [MIN] = 0.000
VM_SPEED Range applied to parameters showing speed
Units Open-loop, RFC-A, RFC-S: RFC-S: rpm or mm/s
Range of [MIN] Open-loop, RFC-A, RFC-S: -33000.0 to 0.0
Range of [MAX] Open-loop, RFC-A, RFC-S: 0.0 to 33000.0
Definition
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_SPEED[MIN] = 2 x VM_SPEED_FREQ_REF[MIN]
VM_SPEED[MAX] = 2 x VM_SPEED_FREQ_REF[MAX]
VM_SPEED_FREQ_REF Range applied to the frequency or speed reference parametersC_VOLTAGE
Units Open-loop: Hz
Range of [MIN] Open-loop: -550.0 to 0.0
Range of [MAX] Open-loop: 0.0 to 550.0
Definition
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.
VM_SPEED_FREQ_REF[MAX] = Calculated based on mechanical system data entered, plus 10 %.
VM_SPEED_FREQ_REF[MIN] = -VM_SPEED_FREQ_REF[MAX].
VM_STD_UNDER_VOLTS Range applied to the standard under voltage threshold
Units V
Range of [MIN] 0 to 1150
Range of [MAX] 0 to 1150
Definition
VM_STD_UNDER_VOLTS[MAX] = VM_DC_VOLTAGE_SET / 1.1
VM_STD_UNDER_VOLTS[MIN] is voltage rating dependent. See Table 8-3 Voltage ratings dependant values on
page 192.
VM_SUPPLY_LOSS_LEVEL Range applied to the supply loss threshold
Units V
Range of [MIN] 0 to 1150
Range of [MAX] 0 to 1150
Definition
VM_SUPPLY_LOSS_LEVEL[MAX] = VM_DC_VOLTAGE_SET[MAX]
VM_SUPPLY_LOSS_LEVEL[MIN] is drive voltage rating dependent. See Table 8-3 Voltage ratings dependant values
on page 192.
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