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