Torque Performance Modes - Allen-Bradley PowerFlex Reference Manual

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Torque Performance Modes

Torque Performance
Modes
[Torque Perf Mode]
+
Current
Limit
+
Voltage Feedback
V/Hz
When torque performance is set to Custom V/Hz the following parameters
are used to define the relationship between frequency and voltage. The
following examples are for a 480v class drive.
Maximum Voltage
Base Voltage
(Nameplate) Voltage
Break Voltage
Start/Accel Boost
Run Boost
The performance of the V/Hz modes and SVC mode are outlined below.
These specifications do not apply to Economize mode due to weakened
field conditions. Slip compensation incorporates the effects of field
weakening so as to minimize the speed regulation error due to either
economize mode or operation above base frequency. The specifications
below are applicable over the constant torque speed range.
Specification
Speed Regulation/accuracy (w/
slip compensation)
Operating Speed Range (w/slip
compensation)
Dynamic Speed Accuracy
(speed response to a 95% step
load change)
Velocity Bandwidth (w/slip
compensation and no encoder)
Minimum settability of velocity
bandwidth/slip compensation
Current
Resolver
V/Hz Control
V/Hz Voltage
Control
Flux
Vector
Control
Break Base Frequency
Frequency (Nameplate)
Normal Duty
Fan/Pump and SVC
Custom V/Hz
0.5% (40:1 0.1% (60:1
speed range) speed range)
40:1 120:1
0.5% base 0.1% base
speed speed
10 rad/s 20 rad/s (50
rad/s desired)
0.1 rad/s 0.1 rad/s
Inverter
Motor
Slip
Estimator
Maximum
Frequency
Heavy Duty
Fan/Pump and SVC
Custom V/Hz
0.5% (40:1 0.1% (60:1
speed range) speed range)
40:1 120:1
0.5% base speed 0.1% base
speed
10 rad/s 20 rad/s (50
rad/s desired)
0.1 rad/s 01 rad/s