Reliance electric GV3000SE, Instruction Manual

Page: 165 / 198

6 - VECTOR REGULATION MODE
49'1329 e GV3000/SE 6 - 15
U.021 Rotor Time Constant / Fast Flux Up
Adjustment Range: 0 to 9999 milliseconds
Default Setting: Power module dependent
Parameter Type: Tunable (at rest or during operation)
Description: This parameter determines the performance of the magnetizing current regulator.
Higher values will increase dynamic response, but may reduce stability.
For most applications, it is recommended that this parameter is not be changed.
For SVC operation, this parameter is used to enable the fast flux-up feature
For special motors or for motors with base speeds < 1150 RPM, the rotor time
constant must be calculated by evaluating equivalent motor circuit data as shown in
the following figure.
R1 X1 X2
R2 Xm
Resistance
R1 = Stator
R2 = Rotor
Reactance
X1 = Stator
X2 = Rotor
Xm = Magnetizing
To calculate the rotor time constant, use the following formula:
Rotor time constant = L / R2
with inductance: L = Lm + L2
Lm = Xm / 2 * 3.14 * (U.003)
L2 = X2 / 2 * 3.14 * (U.003)
Fast Flux-Up Feature (available on drives configured for SVC operation only)
The fast flux-up feature significantly reduces the delay between the initiation of a
run command and the actual motor shaft turning.
Setting U.021 to 0 enables the fast flux-up feature. Parameter U.031 (SVC Sync
Direction) must be set to OFF to use this feature.
Note that this parameter is not functional in versions 6.0 through 6.05.
U.022 Motor Nameplate Power
Parameter Range: 0.3 to 600.0 HP
Default Setting: Power module dependent
Parameter Type: Configurable (at standby only)
Refer to: U.002 Motor Poles U.003 Motor Nameplate Base Frequency
U.004 Motor Nameplate Amps U.005 Motor Nameplate RPM
U.006 Magnetizing Current
U.007 Motor Nameplate Volts
Description: This parameter identifies the motor horsepower as it appears on the motor
nameplate..