ABB ACH550-01 User Manual page 319

Code Description
8119 AUTOCHNG LEVEL
Sets an upper limit, as a percentage of output capacity, for the
autochange logic. When the output from the PID/PFA control block
exceeds this limit, autochange is prevented. For example, use this
parameter to deny autochange when the Pump-Fan system is operating
near maximum capacity.
Autochange overview
The purpose of the autochange operation is to equalise duty time
between multiple motors used in a system. At each autochange
operation:
• A different motor takes a turn connected to the ACH550 output – the
speed regulated motor.
• The starting order of the other motors rotates.
The Autochange function requires:
• external switchgear for changing the drive's output power
connections.
• parameter 8120
Autochange is performed when:
• The running time since the previous autochange reaches the time set
by parameter 8118
• the PFA input is below the level set by parameter 8119
.
LEVEL
314
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= value > 0.
INTERLOCKS
AUTOCHNG INTERV
Parameter listing and descriptions
ACH550-01 User's Manual
Range
0.0...100.0%
.
AUTOCHNG