ABB RCNA-01 Uživatelský manuál stáhnout pdf (Strana 313)

100

101

Parameter listing and descriptions 309

ACH550-01 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

PID output

P 8119

100%

P 8118

1PFA

2PFA

3PFA

4PFA

2PFA

3PFA

P 8122

A = Area above 8119 AUTOCHNG LEVEL – autochange not allowed.

B = Autochange occurs.

1PFA, etc. = PID output associated with each motor.

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