Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 99)

PARAMETER AND VARIABLE DESCRIPTIONS 6-43
1557-UM050F-EN-P – June 2013
PWM Pulse number [PWM pulse number]
Linear number:
295
Minimum value: 1
Maximum value: 361
Analog Output Scaling: NA
This variable indicates the number of pulses per cycle for the active PWM mode.
Synchronizing Regulator Error [Sync reg error]
Linear number:
297
Minimum value: -180 degrees
Maximum value: +180 degrees
Analog Output Scaling: 1.0 V = 18 degrees
This variable is the synchronizing regulator error, which is the phase angle between the line voltage and the
motor voltage during a synchronous transfer from drive to bypass.
Synchronizing Regulator Output [Sync reg output]
Linear number:
298
Minimum value: -10.0 Hz
Maximum value: +10.0 Hz
Analog Output Scaling: 1.0 V = 0.2 Hz
This variable is the synchronizing regulator output, which is added to the speed regulator error during a
synchronous transfer from drive to bypass.
21 Flux Control Variables
Flux Reference [Flux reference]
Linear number:
305
Minimum value: 0.000 pu
Maximum value: 1.500 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the rotor flux reference, which varies between a minimum value set by parameter Flux
Command No Load and a maximum value set by parameter Flux Command Base Speed. The flux reference
varies directly with torque at all speeds, and decreases with speed above Base Speed. The flux reference is
also automatically reduced if the current regulator approaches advance limit or retard limit, which can occur
when running at high speed and high torque with low line voltage.
Flux Feedback [Flux feedback]
Linear number:
306
Minimum value: 0.000 pu
Maximum value: 1.500 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the selected flux feedback, either Flux from Voltage, Flux from Current, or a combination of both.
Flux Error [Flux error]
Linear number:
307
Minimum value: -1.500 pu
Maximum value: 1.500 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the flux error obtained by subtracting the flux feedback from the flux reference.
Isd Command 0 [Isd command 0]
Linear number:
308
Minimum value: 0.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the feedforward component of the D-axis stator current command. It is an estimate of the
steady state D-axis current and is always positive.