Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 72)

6-16 PARAMETER AND VARIABLE DESCRIPTIONS
1557-UM050F-EN-P – June 2013
If Command Bandwidth [If cmd bandwidth]
Linear number:
104
Minimum value: 0.1 r/s
Maximum value: 10.0 r/s
Default value: 1.0 r/s
This parameter specifies the bandwidth of the field current command for synchronous motors. It should be set
to a value that is less than the bandwidth of both the flux regulator and the field current control.
This parameter was added in Rev 5.00 and is not present in 4.xx.
Icd Command Gain [Icd command gain]
Linear number:
105
Minimum value: 0.0
Maximum value: 1.0
Default value: 0.5
This parameter specifies the gain of the capacitor current compensation for synchronous motors. When this
parameter is set to its minimum value of 0.0, all the current for the motor filter capacitor is supplied by the drive.
The line current is higher than the motor current and the motor operates at approximately unity power factor.
When this parameter is set to its maximum value of 1.0, all the current for the motor filter capacitor is supplied
by the motor. The line current is less than the motor current and the motor operates at a lagging power factor
with reduced field current. When this parameter is set to its default value of 0.5, approximately half the motor
filter capacitor current is supplied by the drive and half by the motor. The line current and the motor current are
approximately equal and the motor power factor is slightly lagging. This parameter is not used for induction
motors.
This parameter was added in Rev 5.10 and is not present in 4.xx.
8 Current Control Parameters
Current Regulator Bandwidth [Curreg bandwidth]
Linear number:
113
Minimum value: 0 r/s
Maximum value: 400 r/s
Default value: 200 r/s
This parameter specifies the small signal bandwidth of the current control loop. It is used in the calculation of
the current regulator gain. This parameter affects only the response time of the current regulator and not the
overshoot. It is normally set to 200 radian/second.
DC Link Inductance [L DC link]
Linear number:
114
Minimum value: 0.00 pu
Maximum value: 10.0 pu
Default value: N/A
This parameter specifies the per unit dc link inductance calculated from the nameplate link inductance and the
voltage and current ratings of the drive. It is not saved and is recalculated when any of the parameters affecting
its value are changed.
DC Link Time Constant [T DC link]
Linear number:
115
Minimum value: 0.010 sec
Maximum value: 0.100 sec
Default value: 0.040 sec
This parameter specifies the time constant of the dc current regulator. It affects both the response time and
overshoot of the regulator, and should be adjusted to produce a step response that has zero or a very small
overshoot. This parameter can be set manually or by autotuning.