Parameter and variable descriptions – Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE User Manual
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PARAMETER AND VARIABLE DESCRIPTIONS
1557-UM050F-EN-P – June 2013
Current Feedback Rated Line [I fbk rated line]
Linear number:
159
Minimum value:
0.500 V
Maximum value:
2.500 V
Default value:
N/A
This parameter specifies the rated line current feedback in volts rms calculated from the line CT ratio and
burden and the rated motor current. It is not saved and is recalculated when any of the parameters affecting its
value are changed. The nominal value is 1.768 V. A warning will be displayed if this parameter is out of range.
Current Feedback Rated Motor [I fbk rated motor]
Linear number:
160
Minimum value:
0.500 V
Maximum value:
2.500 V
Default value:
N/A
This parameter specifies the rated motor current feedback in volts rms calculated from the motor CT ratio and
burden and the rated motor current. It is not saved and is recalculated when any of the parameters affecting its
value are changed. The nominal value is 1.768 V. A warning will be displayed if this parameter is out of range.
11 Line Converter Protection Parameters
Line Overcurrent Trip [Line O/C trip]
Linear number:
161
Minimum value:
0.00 pu
Maximum value:
2.00 pu
Default value:
1.50 pu
This parameter specifies the level the line current must exceed before a line overcurrent fault is indicated.
NOTE: For current ratings near the maximum for the drive frame size, this parameter will be automatically
limited to a maximum value less than 2.00. This feature was added in Rev 4.62/5.11.
Line Overcurrent Delay [Line O/C delay]
Linear number:
162
Minimum value:
0.000 sec
Maximum value:
0.040 sec
Default value:
0.004 sec
This parameter specifies the time the line current must remain above the trip level before a line overcurrent
fault is indicated.
Line Overload Trip [Line O/L trip]
Linear number:
163
Minimum value:
0.20 pu
Maximum value:
1.15 pu
Default value:
1.00 pu
This parameter specifies the maximum continuous operating current of the drive.
Line Overload Delay [Line O/L delay]
Linear number:
164
Minimum value:
0 sec
Maximum value:
61 sec
Default value:
60 sec
This parameter specifies the time the drive may operate at 1.5 times the overload trip level before a line
converter overload fault is indicated.