ABB ACH550-01, User Manual

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294 Parameter listing and descriptions
ACH550 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