Emerson Unidrive M702 - Page 142

Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
Basic
parameters
Running
the motor
Optimization
NV Media Card
Operation
Onboard
PLC
Advanced
parameters
Technical
data
Diagnostics
UL listing
information
142 Unidrive M702 User Guide
Issue Number: 3
VM_NEGATIVE_REF_CLAMP1
Limits applied to the negative frequency or speed clamp
VM_NEGATIVE_REF_CLAMP2
Units
Open-loop: Hz
RFC-A, RFC-S: rpm or mm/s
Range of [MIN]
Open-loop: -550.0 to 0.0
RFC-A, RFC-S: -50000.0 to 0.0
Range of [MAX]
Open-loop: 0.0 to 550.0
RFC-A, RFC-S: 0.0 to 50000.0
Definition
VM_NEGATIVE_REF_CLAMP2 is defined in the same way except that Pr 21.001 is used instead of Pr 01.006.
Negative Reference
Clamp Enable (01.008)
Bipolar Reference
Enable (01.010)
VM_NEGATIVE_REF_
CLAMP1[MIN]
VM_NEGATIVE_REF_
CLAMP1[MAX]
00 0.0 Pr 01.006
01 0.0 0.0
1 X -VM_POSITIVE_REF_CLAMP[MAX] 0.0
VM_POSITIVE_REF_CLAMP Limits applied to the positive frequency or speed reference clamp
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
In open-loop mode VM_POSITIVE_REF_CLAMP[MAX] is fixed at 550.0
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. 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) = 2 or 3
(i.e. VM_POSITIVE_REF_CLAMP[MAX] = 50000.0). The table below shows how VM_POSITIVE_REF_CLAMP[MAX]
is defined for different feedback device types
In all modes VM_POSITIVE_REF_CLAMP[MIN] is fixed at 0.0
Feedback device VM_POSITIVE_REF_CLAMP[MAX]
AB,
AB Servo
(500 kHz x 60 / rotary lines per revolution) rpm
(500 kHz / 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 / 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 / linear sine wave pitch in mm) mm/s
Resolver
(1000 Hz x 60 / resolver pole pairs) rpm
(1000 Hz / pole pitch in mm / resolver pole pairs) 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]