Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 100)

6-44 PARAMETER AND VARIABLE DESCRIPTIONS
1557-UM050F-EN-P – June 2013
Isd Command 1 [Isd command 1]
Linear number:
309
Minimum value: -1.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the closed loop correction component of the D-axis stator current command. It is the output of
the flux regulator and may be positive or negative.
Isd Command [Isd command]
Linear number:
310
Minimum value: -1.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the D-axis stator current command, which is the sum of Isd Command 0 and Isd Command 1.
Icd Command [Icd command]
Linear number:
311
Minimum value: 0.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the D-axis capacitor current command. It is an estimate of the D-axis current provided by the
motor filter capacitor.
Ix Command [Ix command]
Linear number:
312
Minimum value: -1.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the magnetizing current command obtained by subtracting Icd Command from Isd Command.
It is positive for lagging current and negative for leading current.
I Field Command [I field command]
Linear number:
314
Minimum value: 0.000 pu
Maximum value: 1.000 pu
Analog Output Scaling: 10.0 V = 1.000 pu
This variable is the current command for the synchronous motor field supply. For synchronous drives, this
variable must be assigned to one of the external analog outputs (normally output 4L). An analog output of 10.0
V corresponds to maximum field current, which should be somewhat higher than rated field current. The
scaling of the field current command can be adjusted to match the scaling of the field supply current reference
input using parameter Analog Scale 4L in Analog Output Parameters. For induction motors this variable is
always equal to zero.
This variable was added in Rev 5.00 and is not present in 4.xx.
22 Current Control Variables
Idc Reference [Idc reference]
Linear number:
321
Minimum value: 0.000 pu
Maximum value: 2.000 pu
Analog Output Scaling: 5.0 V = 1.0 pu
This variable is the dc link current reference.