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3.1.7 Automatic Pump Change
There are three possibilities of automatic pump change:
1. Operation-dependent pump change.
This applies to pumps of equal priority. The pump which is
switched on first will be switched off first if the demand falls.
2. Fault-dependent pump change.
If a pump is faulty, it will be switched off and the next pump
ready for operation will be switched on.
3. Time-dependent pump change.
This ensures that the operating hours are distributed evenly
on the pumps in the zone. This function is combined with the
test run function.
Operation with PFU 2000 RAM / PMU 2000 Settings:
When "pump change" is set to "on" (display 208), time-de-
pendent pump change is carried out at the first time set in
"pump change at" "00:00 h" (display 209).
The default setting of "pump change" is "on" (display 208).
The default setting of "pump change at" is "00:00 h"
(display 209).
If "pump change" is set to "off" (display 208), no time-depend-
ent pump change or test run will be carried out.
Operation with PFU 2000 EPROM Settings:
Time-dependent pump change is carried out the first time
5 minutes after the electricity supply has been switched on
and then every 24 hours.
3.1.8 Test Run
To eliminate the risk of blocking of pumps which are not switched
on regularly, a test run is carried out.
The test run causes all operative pumps to be started once be-
tween two time-dependent pump changes for 1 sec.
3.1.9 Clock Functions
Operation with PFU 2000 RAM / PMU 2000 Settings:
If the system demand varies during the day and/or during the
week, the pump performance required will also vary. In this case,
a clock program can be set in order to achieve optimum perform-
ance of the pumps.
It is possible to set a total of 10 switching times, all with individual
setpoints.
If "setpoint max." (display 200) is changed after the clock program
has been set, the clock program will be changed proportionally.
Application: Time-dependent reduction of setpoint to minimize
power consumption or to optimize the performance.
Fig. 11
Clock Program with Three Switching Times
Setpoint
C
B
A
1
To ensure correct operation with the clock functions, the time and
date can be set in the basic menu of the PMU 2000 (display 103).
Supply failure does not influence the clock program.
Operation with PFU 2000 EPROM Settings:
No clock program.
3.1.10 Standby Pumps
Operation with PFU 2000 RAM / PMU 2000 Settings:
In zones with more than one pump, the number of standby pumps
can be selected in "stand-by pumps" (display 226). A standby
pump is only started if the duty pump is faulty, not to increase the
performance of the system.
The standby pump(s) will be included in the automatic pump
change and the test run.
The setting range is from one pump to the number of pumps con-
nected to the zone less one.
The default setting is 0.
If individual pumps are to be defined as standby pumps, these
pumps must be set to a lower priority than the duty pumps.
For further information, see section
3.1.12 Pump Priority.
Operation with PFU 2000 EPROM Settings:
The default setting is 0.
2
3
Time
11
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