2-162 Torque Performance Modes
Torque Performance
Modes
[Torque Perf Mode]
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.
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.
Normal Duty Heavy Duty
Specification Fan/Pump and
Custom V/Hz
SVC Fan/Pump and
Custom V/Hz
SVC
Speed Regulation/accuracy (w/
slip compensation)
0.5% (40:1
speed range)
0.1% (60:1
speed range)
0.5% (40:1
speed range)
0.1% (60:1
speed range)
Operating Speed Range (w/slip
compensation)
40:1 120:1 40:1 120:1
Dynamic Speed Accuracy
(speed response to a 95% step
load change)
0.5% base
speed
0.1% base
speed
0.5% base speed 0.1% base
speed
Velocity Bandwidth (w/slip
compensation and no encoder)
10 rad/s 20 rad/s (50
rad/s desired)
10 rad/s 20 rad/s (50
rad/s desired)
Minimum settability of velocity
bandwidth/slip compensation
0.1 rad/s 0.1 rad/s 0.1 rad/s 01 rad/s
Current
Limit
Voltage Feedback
Flux
Vector
Control
Slip
Estimator
V/Hz
V/Hz Control
Voltage
Control
Current
Resolver
Inverter
Motor
+
+
Maximum Voltage
Maximum
Frequency
Base Voltage
(Nameplate) Voltage
Base Frequency
(Nameplate)
Break
Frequency
Run Boost
Start/Accel Boost
Break Voltage
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