ABB ACQ580, Firmware Manual

Page: 69 / 422

Program features 65

Level control
The Level control function can be used to control the water level in tank filling or
emptying application. The function supports up to eight pumps. The function can be
enabled by setting parameter
76.21 Multipump configuration to Level control -
Emptying or Level control - Filling .
The figure below represents a waste water pumping system in emptying mode. The
system has varying water level and the pumps will start and stop based on measured
level.
The first pump (master) will start when the actual level is above the start point 1. More
pumps will start and stop based on the rising (emptying) or falling (filling) water levels
of individual pumps. In case of a pump failure or if drive is disconnected for
maintenance, the system still continues operation with the remaining pumps and
drives.
EFB (I2I)
DI
DI
EFB (I2I) EFB (I2I)
Digital high
level sensor
DI
DI
DI
DI
Digital low
level sensor
High level warning
Full speed level
Low level warning
Start level for pump 3
Start level for pump 2
Stop level for pumping
AI
AI AI
Analog level
sensor
Start level for pump 1
DI
DI
AI
EFB (I2I)
Drive 1 Drive 2 Drive 3 Drive 8