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•
"timer" (minutes)
An internal timer program in the PMU 2000 controls the set-
point in accordance with a table. This timer is started when the
contact on the PFU 2000 input 3 is closed.
The setting range is 0 to 200 minutes.
Application: Processes in which a time-controlled shape of the
setpoint must be achieved during a certain period.
•
"Temp Tf" (°C, °F)
The flow-pipe temperature (measured on the PFU 2000
input 3) controls the setpoint in accordance with a table.
Examples of application: Heating and cooling systems.
•
"Temp Tr" (°C, °F)
The return-pipe temperature (measured on the PFU 2000
input 3) controls the setpoint in accordance with a table.
Examples of application: Heating and cooling systems.
•
"Temp To" (°C, °F)
The ambient temperature (measured on the PFU 2000 input 3)
controls the setpoint in accordance with a table.
Examples of application: Heating and cooling systems.
•
"level" (m, cm, ft, in)
The level signal (PFU 2000 input 3) controls the setpoint in ac-
cordance with a table.
Examples of application: Water supply depending on cistern
level. Level control.
3
•
"flow" (m
/h, l/h, l/s, gpm)
The flow signal (PFU 2000 input 3) controls the setpoint in ac-
cordance with a table.
Examples of application: Flow-dependent compensation of
pressure drop in water supply systems or differential pressure
drop compensation in circulation systems if a flow meter signal
is available.
Remote Control of Setpoint via a PCU 2000:
Via PCU 2000 inputs for the pumps connected to the zone and
the GRUNDFOS BUS, the setpoint may be controlled linearly to
the PCU 2000 input signal.
Operation with PFU 2000 EPROM Settings:
Setpoint Influences via External Signals:
The PFU 2000 input 3 can be connected to a 0-10 V signal for re-
mote setting of setpoint.
Fig. 16
Setpoint via External Signals
Current setpoint
Actual setpoint
100%
Locally set setpoint
Locally set setpoint
0
The locally set setpoint is set by means of the function selector in
the PFU 2000, see fig. 13.
10 V
3.2.6 On/Off Band
The on/off band (display 207) is the pressure above the actual
setpoint that is used to calculate the switch off levels for the
pumps.
Operation with PFU 2000 RAM / PMU 2000 Settings:
The default setting for the on/off band is 10% of the measuring
range of the signal transmitter.
Operation with PFU 2000 EPROM Settings:
The default setting for the on/off band is 10% of the measuring
range of the signal transmitter.
For further information, see section
3.1.4 Cascade Control.
15
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