ABB ACH550-02-645A-4 [319/454] Ach550 02 user s manual

ABB ACH550-02-645A-4 [319/454] Ach550 02 user s manual
Parameter listing and descriptions 315
ACH550-02 User's Manual
Note: The ACH550 always coasts to stop when autochange is
performed.
In an autochange, the Autochange function does all of the following
(see the figure):
Initiates a change when the running time, since the last autochange,
reaches 8118
AUTOCHNG INTERV and PFA input is below limit 8119
AUTOCHNG LEVEL.
Stops the speed regulated motor.
Switches off the contactor of the speed regulated motor.
Increments the starting order counter, to change the starting order for
the motors.
Identifies the next motor in line to be the speed regulated motor.
Switches off the above motor’s contactor if the motor was running.
Any other running motors are not interrupted.
Switches on the contactor of the new speed regulated motor. The
autochange switchgear connects this motor to the ACH550 power
output.
Delays motor start for the time 8122 PFA
START DELAY.
Starts the speed regulated motor.
Identifies the next constant speed motor in the rotation.
Switches the above motor on, but only if the new speed regulated
motor had been running (as a constant speed motor) – This step
keeps an equal number of motors running before and after
autochange.
Continues with normal PFA operation.
Code Description Range
P 8118
B
PID output
P 8119
100%
P 8118
1PFA
2PFA
3PFA
4PFA
4PFA
2PFA
3PFA
A
P 8122
A = Area above 8119 AUTOCHNG LEVEL – autochange not allowed.
B = Autochange occurs.
1PFA, etc. = PID output associated with each motor.
t

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