ABB DriveIT ACH550-01 User Manual page 305

ACH550 User's Manual
Code Description
8119 AUTOCHNG LEVEL
Sets an upper limit, as a percent 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 equalize 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 dive's output power
connections.
• Parameter 8120
Autochange is performed when:
• The running time since the previous autochange reaches the time
set by 8118
• The PFA input is below the level set by this parameter, 8119
AUTOCHNG LEVEL
Parameter listing and descriptions
= value > 0.
INTERLOCKS
AUTOCHNG INTERV
.
Range
0.0...100.0%
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