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Digitax HD M753 Control User Guide
Issue Number: 3
VM_POSITIVE_REF_CLAMP1
Limits applied to the positive frequency or speed reference clamp
VM_POSITIVE_REF_CLAMP2
Units
Open-loop: Hz
RFC-A, RFC-S: rpm or mm/s
Range of [MIN]
Open-loop: 0.0
RFC-A, RFC-S: 0.0
Range of [MAX]
Open-loop: 550.0
RFC-A, RFC-S: 0.0 to 50000.0
Definition
VM_POSITIVE_REF_CLAMP1[MAX] defines the range of the positive reference clamp,
Maximum Reference Clamp
(01.006), which in turn limit the references. In RFC-A and RFC-S modes a limit is applied so that the position feedback
does not exceed the speed where the drive can no longer interpret the feedback signal correctly as given in the table
below. The limit is based on the position feedback device selected with
Motor Control Feedback Select
(03.026). It is
possible to disable this limit if the
RFC Feedback Mode
(03.024)
≥
1 (i.e. VM_POSITIVE_REF_CLAMP1 = 50000.0),
so that the motor can be operated at a speed above the level where the drive can interpret the feedback in sensorless
mode. It should be noted that the position feedback device itself may have a maximum speed limit that is lower than
those given in the table. Care should be taken not to exceed a speed that would cause damage to the position feedback
device.
In open-loop mode VM_POSITIVE_REF_CLAMP1[MAX] is fixed at 550.0 Hz
In RFC mode a limit is applied to the speed reference of 550 x 60 / Motor pole pairs. Therefore, with a 4 pole motor the
limit for VM_POSITIVE_REF_CLAMP1[MAX] will be 16,500 rpm.
VM_POSITIVE_REF_CLAMP1[MIN] = 0.0
VM_POSITIVE_REF_CLAMP2 is defined in the same way as VM_POSITIVE_REF_CLAMP1 except
VM_POSITIVE_REF_CLAMP2[MAX] defines the range of the positive reference clamp,
M2 Maximum Reference
Clamp
(21.001), which in turn limits the references.
Feedback device
VM_POSITIVE_REF_CLAMP1[MAX]
AB,
AB Servo
(500 kHz x 60 / rotary lines per revolution) rpm
(500 kHz x linear line pitch in mm) mm/s
FD, FR,
FD Servo, FR Servo
(500 kHz x 60 / rotary lines per revolution)/2 rpm
(500 kHz x linear line pitch in mm)/2 mm/s
SC,
SC Hiper, SC EnDat,
SC SSI, SC Servo
(500 kHz x 60 / sine waves per revolution) rpm
(500 kHz x linear line pitch in mm) mm/s
Resolver
(250 Hz x 60) rpm
(250 Hz x pole pitch in mm) mm/s
Any other device
50000.0 rpm or mm/s
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] =
Maximum Rated Current
(11.060) and is dependent on the drive rating. This is the
Heavy Duty rating of the drive.
VM_RATED_CURRENT [MIN] = 0.000
Summary of Contents for Digitax HD M753 EtherCAT
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