Feedback device VM_POSITIVE_REF_CLAMP1[MAX]
AB, AB Servo
(500kHz x 60 / rotary lines per revolution) rpm
(500kHz x linear line pitch in mm) mm/s
FD, FR, FD Servo, FR Servo
(500kHz x 60 / rotary lines per revolution)/2 rpm
(500kHz x linear line pitch in mm)/2 mm/s
SC, SC Hiper, SC EnDat, SC SSI, SC Servo
(500kHz x 60 / sine waves per revolution) rpm
(500kHz x linear line pitch in mm) mm/s
Resolver
(250Hz x 60) rpm
(250Hz x pole pitch in mm) mm/s
Any other device 50000.0 rpm or mm/s
The limit ensures that the frequency of incremental digital or sine wave signals from the encoder do not exceed 500kHz and the modulation frequency
for a resolver does not exceed 1kHz, neglecting any speed controller overshoot. The position feedback resolution remains fixed over the whole
frequency for digital signals, but reduces with increased frequency or reduced voltage with sine wave signals. The position resolution with sine wave
signals is given by the equations below.
Position resolution for a rotary device = K x sine waves per revolution
Position resolution for a linear device = K x sine waves per pole pitch
The value of K varies with the frequency and magnitude of the sine wave signals. The nominal value of K is 1024, and the drive interface provides at
least this resolution with 1.0Vp-p sine waves up to a frequency of 50kHz. The table below shows the variation of K with sine wave peak to peak voltage
and frequency.
1kHz 5kHz 50kHz 100kHz 200kHz 500kHz
1.2Vp-p 2048 2048 1024 1024 512 512
1.0Vp-p 2048 2048 1024 512 512 128
0.8Vp-p 1024 1024 1024 512 256 128
0.6Vp-p 1024 1024 512 512 256 128
0.4Vp-p 512 512 512 256 128 64
VM_POSITIVE_REF_CLAMP[MAX] in Open-loop mode is fixed at 3000.0 as position feedback cannot be used for motor control.
VM_POSITIVE_REF_CLAMP[MIN] = 0.0
(Note: An additional limit is applied to ensure that the drive output frequency cannot exceed 550Hz. For Open-loop mode an additional limit of 550Hz 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_POSITIVE_REF_CLAMP2[MAX] defines the range of the positive reference clamp, M2 Maximum Reference Clamp (21.001), which in turn limit the
references. See VM_POSITIVE_REF_CLAMP1 for more details.
Identifier VM_POWER
Description 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
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] 0.000
Range of [MAX] 0.000 to 99999.999
VM_RATED_CURRENT [MAX] = Maximum Rated Current (11.060) and is dependent on the drive rating.
VM_RATED_CURRENT [MIN] = 0.000
Identifier VM_REGEN_REACTIVE
Description Range applied to the reactive current reference in Regen mode
Units %
Range of [MIN] -1000.0 to 0.0
Range of [MAX] 0.0 to 1000.0
VM_REGEN_REACTIVE[MAX] applies a limit to the reactive current reference in Regen mode so that the total current reference does not exceed its
maximum allowed level.
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