ABB ACH550-01 User Manual page 320

ACH550-01 User's Manual
Code Description
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):
P 8119
3PFA
2PFA
1PFA
A = Area above 8119
B = Autochange occurs.
1PFA, etc. = PID output associated with each motor.
• Initiates a change when the running time, since the last autochange,
reaches 8118
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
• 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.
Parameter listing and descriptions
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PID output
4PFA
100%
P 8118
AUTOCHNG LEVEL
AUTOCHNG INTERV
.
Range
P 8122
P 8118
B
– autochange not allowed.
and PFA input is below limit 8119
START DELAY
A
2PFA
3PFA
4PFA
t
.
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