ABB ACQ810 - Level Control Macro; Description and Typical Application

102 Application macros
Level control macro
 Description and typical application
The level control macro is designed for controlling a station of 1 to 8 pumps that is
used for either emptying or filling a container.
The level control functionality is activated by setting parameter 79.01 Level mode to
Emptying or Filling and selecting external control location EXT2. The start levels for
the pumps (as well as the alarm levels) are set by parameters in group 79 Level
control.
At any given time, one of the drives acts as master. The master status can be rotated
between the drives using the Autochange function, or one drive can be fixed to
master status. The start/stop level settings of the master are the ones in effect.
The following drawing represents a station with three submersible pumps in emptying
mode. Each pump has a pre-defined start level, and more pumps are started as the
level in the container rises. The level sensor is connected to an analog input that is
selected as the process actual value in parameter group 28 Procact sel.
XD2D
DI
DI
XD2D XD2D
3 3 3
Digital high
level sensor
DI
DI
DI
DI
Digital low level
sensor
High level alarm
Pumps at high speed
Low level alarm
Start level for pump 3
Start level for pump 2
Stop level
AI
AI AI
Analog level
sensor
Start level for pump 1