Manual lead pump operation

The user can set the pump preference manually by changing the switch position.


Whenever the "ManSwCond" changes the pump sequence, the transition will be done with gap or overlap as defined by the parameters SYS-06 and SYS-07.

Therefore an new manual switch condition will get true not until a delay of "SYS-07 take overtime" + 2 controller cycles.


When a switch transition from 2 or 3 to auto mode occurs, the pump preference will be the last one from auto mode.


ManSwCond input

Behaviour

maintenance switch
(SYS-08 = 0)

Behaviour

preference switch
(SYS-08 = 1)

0; 1

off

off

2

pump 1

pump preference 1 - 2

3

pump 2

pump preference 2 - 1

4

both pumps

both pumps

5

auto

auto


Fixed lead pump operation (SYS-08 = 0)

In maintenance mode no automatic changeover is possible, even if a pump failure or pump off alarm occurs. This means, the failed pump will stop and the second pump will not take over.

In the "ManSwCond" off-position (0; 1), it is not possible to start pumps at all, even if the input "PumpEnable" is on. To enable the automatic changeover procedure again, the manual switch condition must be set to “5”.

Pump1 runs if "ManSwCond" = 2 and the pump does not stop due to an alarm condition with manual reset - see chapter pump alarms.

Pump2 runs if "ManSwCond" = 3 and the pump does not stop due to an alarm condition with manual reset - see chapter pump alarms.

The input "PumpEnable" will start and stop the pumps only in auto mode (5).


Manual lead pump operation (SYS-08 = 1)

In preference mode, the pump changeover is realised only manually by changing the switch position. The lead pump, set by the preference condition (1-2 or 2-1), will start and stop according to the input "PumpEnable".  If a failure and/ or pump off alarm occurs on the leading pump, the other pump will take over.

In the  "ManSwCond" off-position (0), it is not possible to start pumps at all, even if the input "PumpEnable" is on. To enable the automatic changeover procedure again, the manual switch condition must be set to “5”.


Release one or two pumps

In the manual lead pump operation-mode (SYS-08 = 1), or in the auto-modes, it is possible to release the next pump, when the internal datapoint input  "Enable2Pumps" is activated.

If the internal datapoint input "Enable2Pumps" is activated, both pumps will be released at the same time, whether the input "PumpEnable" is activated or not.


Alarm reset

An alarm reset will be triggered for all the cases (maintenance or preference switch) if the manual switch is once in the off position and than switched to another position different of "off".

If a manual switch and a "Reset" input are connected, both inputs will trigger a reset pulse.