Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 16)

2-4 FlexPak 3000 DC Drive Software Reference
4. A zero reference is input to the current minor loop reference path.
5. The drive waits until armature current reaches discontinuous conduction.
6. The main contactor is opened and the DB contactor is closed.
Current Limit Stop Sequencing
Current limit stop sequencing is used when one of these conditions occurs:
• an active stop input is asserted, STOP MODE SELECT (P.114) is set to CURRENT LIMIT ,
and the drive is in run mode
• the jog input is deasserted when the drive is in jog mode and STOP MODE SELECT
(P.114) is set to CURRENT LIMIT . Deasserting the jog input will not initiate the stop
sequence until the speed feedback is less than or equal to STOP SPEED THRESHOLD
(P.113) or until the JOG OFF DELAY TIME (P.121) is exceeded, whichever occurs last.
In a current limit stop sequence:
1. From run mode: A zero reference is input to the speed loop reference path at the
speed loop summing junction.
From jog mode: A zero reference is input to the jog reference ramp block.
2. Jog mode only: The jog reference ramps toward zero at the rate set by JOG
ACCEL / DECEL TIME (P.013).
3. The drive waits until speed feedback falls below STOP SPEED THRESHOLD (P.113).
If the drive is regenerative (S6R), this phase of the current limit stop sequence
takes little time. If the drive is non-regenerative (S6), the motor coasts during this
phase of the current limit stop sequence.
4. A zero reference is input to the current minor loop reference path.
5. The drive waits until armature current reaches discontinuous conduction.
6. The main contactor is opened and the DB contactor is closed.