Pumpe Styring - Danfoss ADAP-KOOL AK-PC 783 Design Manual

Pump control
The controller can control and monitor one or two pumps that
circulate the CO2.
If two pumps are used, and operating time equalisation is se-
lected, the controller can also perform a changeover between the
two pumps if operating alarms occur.
Activity in the case of operating alarm
Pump selection is performed using the following setting:
0: Both pumps are stopped
1: Pump 1 is started up
2: Pump 2 is started up
3: Both pumps are started up
4: Automatic changeover between the pumps is permitted. Start
before stop.
5: Automatic changeover between the pumps is permitted. Stop
before start.
(This function is used when both pumps are controlled in shifts by
the same frequency converter.)
108 Capacity controller RS8GN202 © Danfoss 11-2013
Automatic changeover between the pumps (only for setting = 4
and 5)
Start before stop
Stop before start
Using this setting there can be alternation between the two
pumps so that a type of operating time equalisation is achieved.
The period between the pump changeovers can be set as "Pump-
Cycle". On changeover to the second pump, the first one will
remain in operation for the "PumpDel" time. It will then stop.
At stop before start "PumpDel" will be the break time for changeo-
ver.
AK-PC 783