Rockwell Automation FlexPak 3000 Digital DC Drive Version 4.3 - Manual (Page 15)

Drive Sequencing 2-3
Coast/DB Stop Sequencing
Coast/DB stop sequencing is used when one of these conditions occurs:
• an active stop input is asserted and STOP MODE SELECT (P.114) is set to COAST / DB
• a permissive input is opened
• a fault condition is detected
In a coast/DB stop sequence:
1. Armature firing angle is forced to a small non-zero value.
2. The drive waits until armature current reaches discontinuous conduction.
3. The main contactor is opened and the DB contactor is closed.
Ramp Stop Sequencing (Run Mode)
Run mode ramp stop sequencing is used when all of these conditions exist:
• an active stop input is asserted
•
STOP MODE SELECT (P.114) is set to RAMP STOP
• the drive is in run mode
In a ramp stop sequence from run mode:
1. A zero reference is input to the S-curve block.
2. The speed reference ramps toward zero at the rate set by DECELERATION TIME
(P.002) or RAMP STOP DECEL TIME (P.018) (as determined by the setting of STOP
DECEL SELECT (P.122)).
3. The drive waits until speed feedback falls below STOP SPEED THRESHOLD (P.113).
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.
Ramp Stop Sequencing (Jog Mode)
In jog mode, ramp stop sequencing is used when all of these conditions exist
•
STOP MODE SELECT (P.114) is set to RAMP STOP
• the drive is in jog mode
• the jog input is deasserted
• Speed feedback is less than or equal to STOP SPEED THRESHOLD (P.113) or JOG OFF
DELAY TIME (P.121) is exceeded, whichever occurs last
In a ramp stop sequence from jog mode:
1. A zero reference is input to the jog reference ramp block.
2. 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).