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
Deceleration Time 4 [Decel time 4]
Linear number:
72
Minimum value:
0 sec
Maximum value:
999 sec
Default value:
3 sec
This parameter specifies the time for the speed reference to decrease from Ramp Speed 4 to Ramp Speed 3.
Ramp Speed 1 [Ramp speed 1]
Linear number:
73
Minimum value:
5.0 Hz
Maximum value:
6.0 Hz
Default value:
5.0 Hz
This parameter specifies the first break point in the speed ramp and also the speed at which the drive switches
between starting mode and normal running mode. THIS PARAMETER IS SET AT THE FACTORY AND
SHOULD NOT BE CHANGED WITHOUT CONSULTING THE FACTORY.
Ramp Speed 2 [Ramp speed 2]
Linear number:
74
Minimum value:
5.0 Hz
Maximum value:
100.0 Hz
Default value:
12.0 Hz
This parameter specifies the second break point in the speed ramp. It must be greater than Ramp Speed 1.
Ramp Speed 3 [Ramp speed 3]
Linear number:
75
Minimum value:
5.0 Hz
Maximum value:
100.0 Hz
Default value:
54.0 Hz
This parameter specifies the third break point in the speed ramp. It must be greater than Ramp Speed 2.
Ramp Speed 4 [Ramp speed 4]
Linear number:
76
Minimum value:
5.0 Hz
Maximum value:
100.0 Hz
Default value:
60.0 Hz
This parameter specifies the fourth break point in the speed ramp. It must be greater than Ramp Speed 3.
Coast Speed [Coast speed]
Linear number:
77
Minimum value:
2 Hz
Maximum value:
100 Hz
Default value:
2 Hz
This parameter specifies the speed at that the drive shuts off and coasts when stopping.
Ramp Start Delay [Ramp start delay]
Linear number:
78
Minimum value:
1 sec
Maximum value:
10 sec
Default value:
3 sec
This parameter specifies the time the speed reference remains at zero after the drive is started. The purpose of
the delay is to allow flux to be established in the motor before attempting to accelerate. If the torque required at
starting is very low then this parameter can be set to a small value such as 1 second, but should be set to a
higher value if high starting torque is required. This parameter is active even when tach feedback is enabled.