Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 101)

PARAMETER AND VARIABLE DESCRIPTIONS 6-45
1557-UM050F-EN-P – June 2013
Idc Feedback [Idc feedback]
Linear number:
322
Minimum value: 0.000 pu
Maximum value: 2.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the measured dc link current feedback.
Idc Error [Idc error]
Linear number:
323
Minimum value: -2.000 pu
Maximum value: 2.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the dc current error obtained by subtracting the dc current feedback from the dc current
reference.
V Line [V line]
Linear number:
324
Minimum value: 0.000 pu
Maximum value: 1.500 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the measured line voltage. A value of 1.000 pu corresponds to rated motor voltage.
Vdc Reference [Vdc reference]
Linear number:
326
Minimum value: -1.000
Maximum value: 1.000
Analog Output Scaling: 10.0 V = 1.0
This variable is the dc voltage reference, which is the output of the current regulator after the advance limit and
retard limit have been applied. A value of 1.000 corresponds to maximum positive voltage (motoring) and a
value of
–1.000 corresponds to maximum negative voltage (regenerating) regardless of the direction of motor
rotation.
Alpha Line [Alpha line]
Linear number:
327
Minimum value: 0.0 deg
Maximum value: 180.0 deg
Analog Output Scaling: 10.0 V = 360 degrees
This variable is the line converter firing angle, which is equal to the inverse cosine of the dc voltage reference.
It is in the range 0 to 90 degrees for motoring and 90 to 180 degrees for generating.
Alpha Machine [Alpha machine]
Linear number:
328
Minimum value: 0.0 deg
Maximum value: 359.9 deg
Analog Output Scaling: 10.0 V = 360 degrees
This variable is the machine converter firing angle. It is in the range 0 to 90 degrees for leading generating, 90
to 180 degrees for leading motoring, 180 to 270 degrees for lagging motoring, and 270 to 360 degrees for
lagging generating.