Automatic pump changeover
Automatic pump changeover, based on fixed period and/ or run-times
Automatic pump changeover switching will be done periodically and at a pump failure or a pump off alarm.
By changing the value of parameter SYS-01, preference switching is selectable as shown in the next table.
SYS-01 |
Cyclic changeover type selection |
0 |
fixed (independent of run-times) at a predefined day/ time (defined by SYS-02, SYS-03 and SYS-04) |
1 |
on difference in run-times (SYS-05) and when the next predefined day/ time (defined by SYS-02, SYS-03 and SYS-04) is reached. |
2 |
immediately, if difference in run-times (SYS-05) has been exceeded (no predefined time of day) |
Selectable time/ date for automatic changeover
The moment of automatic changeover switching can be predefined at day and hour (on a daily, weekly or monthly base), adjusted by parameters SYS-02, SYS-03 and SYS-04. With parameter SYS-02 the period of cyclic changeover is selectable, as shown in next table.
SYS-02 |
Cyclic changeover type selection |
0 |
no cyclic changeover switching at all |
1 |
daily, at a pre-defined time of day (SYS-04) |
2 |
weekly, at a predefined day of week (SYS-03) and time of day (SYS-04). If SYS-03 >=7 than day of week = 7 (Sunday) |
3 |
monthly, at a predefined day of month (SYS-03) and time of day (SYS-04). If SYS-03 >= the last day of the month, than day of month = the last day of the month |
Pump changeover at pump failure and pump off alarms
If the manual switch condition input "ManSwCond" is configured as a preference switch (SYS-08 = 1), than the changeover will happen immediately at pump failure and pump off alarms.
If the manual switch condition input "ManSwCond" is configured as a maintenance switch (SYS-08 = 0), than the changeover can happen only if the switch is in auto mode.
Pump transition with a gap or with an overlap
With parameter SYS-06, the execution of pumps changeover switching can be selected with a gap- or an overlap- function.
In case of a gap-selection (SYS-06 = 0) the lead pump will be stopped and after a delay, defined by the value of parameter SYS-07, the next pump is set to operation.
In case of an overlap-selection (SYS-06 = 1), the next pump is already set to operation and after a delay, defined by the value of parameter SYS-07, the former lead pump will stop.
Note: Upon failure of the lead pump, the switch over occurs immediately.
Changeover parameters
Description |
Default value |
SYS-01: type of preference change 0 = fixed time 1 = fixed time after exceeding hours run 2 = immediately after exceeding hours run |
0 |
SYS-02: period of preference change 0 = none 1 = daily 2 = weekly 3 = monthly |
1 |
SYS-03: day of preference change (if SYS-02 = 2 then Monday = 1) |
3 |
SYS-04: time of preference change |
1000 hhmm |
SYS-05: runtime difference between pumps |
100 h |
SYS-06 :take over type 0 = gap 1 = overlap |
0 |
SYS-07: take over time |
10 s |
SYS-08: type of switch 0 = maintenance 1 = preference |
0 |