ABB ACS560 Firmware Manual page 128

128 Control macros
In addition, the PFC logic also supports the following features:
Autochange
Autochange functionality or the automatic rotation can be used to automatically rotate
the start order of the PFC system. This function has the following features:
• Keeps the run time of the pumps/fans equal over time to even their wear .
• Prevent any pump/fan from standing still for too long, which otherwise would clog
up the unit.
In some cases it is desirable to rotate the start order only when all units are stopped,
for example to minimize the impact on the process.
The Autochange function can be defined in the parameter group
configuration.
Note: The Autochange function also triggered by the Timed function. See description
on page 60.
There are 2 modes of auto change with PFC:
1. Autochange PFC with auxiliary motors
In this mode auto rotation happens with only 2nd and 3rd pump. Two pumps meet
the flow consumption for long term running and the 3rd pump is reserved for
shifting.
76 PFC