ABB ACH550-01-04A1-4 [314/476] Parameter listing and descriptions

310 Parameter listing and descriptions

ACH550-01 User's Manual

8117 NR OF AUX MOT 0…4

Sets the number of auxiliary motors.

• Each auxiliary motor requires a relay output, which the drive uses to

send start/stop signals.

• The Autochange function, if used, requires an additional relay output

for the speed regulated motor.

The following describes the set-up of the required relay outputs.

Relay outputs

As noted above, each auxiliary motor requires a relay output, which the

drive uses to send start/stop signals. The following describes how the

drive keeps track of motors and relays.

• The ACH550 provides relay outputs RO1…RO3.

• An external digital output module can be added to provide relay

outputs RO4…RO6.

• Parameters 1401…1403 and 1410…1412 define, respectively, how

relays RO1…RO6 are used – the parameter value 31 (PFA) defines

the relay as used for PFA.

• The ACH550 assigns auxiliary motors to relays in ascending order. If

the Autochange function is disabled, the first auxiliary motor is the

one connected to the first relay with a parameter setting = 31 (PFA),

and so on. If the Autochange function is used, the assignments rotate.

Initially, the speed regulated motor is the one connected to the first

relay with the parameter setting = 31 (PFA), the first auxiliary motor is

the one connected to the second relay with a parameter setting =

31 (PFA), and so on.

• The fourth auxiliary motor uses the same reference step, low

frequency and start frequency values as the third auxiliary motor.

Code Description Range

ACH550

Standard PFA mode