Bank Control - ABB ControlMaster Series Manual

ControlMaster CMF160
Universal process indicator, fieldmount

Bank control

Bank control enables improved control of multi-element output
devices such as banks of heaters, pumps and fans. Aimed at
minimizing wear caused by over-use of one specific 'duty'
device, bank control enables wear to be levelled by sharing
duty and assist handling between every device in the bank.
Ideal for pump control applications in the water and waste
water industry. Up to six pumps can be controlled each with
independent on and off trip points (see Fig. 10). The CMF160's
universal process input, complete with transmitter power
supply, makes it suitable for connection to many kinds of
standard level transmitters.
Bank control provides users the choice of either 'Rotate' or
'First In, First Out (FIFO)' wear-levelling schedules. Rotate
cycles which pump is the first to switch on during a pumping
event. FIFO ensures that the last pump to switch of is the last
pump to be called again. Fig. 11 details Rotate and FIFO
cycling for a 3-pump system.
Trip 1
Trip 2
Level
Trip 3
Trip 4
Pump 1
Pump 2
Rotate
Pump 3
Pump 1
FIFO
Pump 2
Pump 3
Fig. 11: Rotate and FIFO cycling for a 3-pump system
8 DS/CMF160–EN Rev. B | ControlMaster CMF160 | Universal process indicator, fieldmount
Inlet
On
On
Off
Off
P1
Fig. 10: Independent on and off trip points
On
Off
P2 P3
Outlet