Speed Selection - Grundfos UPS Serie Instructions

5.3 Speed selection

5.3.1 Three-speed pumps, all models except
3 x 460 V and 575 V
The speed switch in the terminal box can be turned
to three positions. The speed in the three positions
appears in the table below (also see fig. 13).
Speed in % of maximum speed
Switch
position Single-phase
pumps
1 approx. 60 %
2 approx. 80 %
3 100 %
Changing to lower speeds offers considerable
reduction in energy consumption and less noise
in the system.
H H
1
Q
H = head and Q = flow
Fig. 13 Pump performance at speed
settings
WARNING
Never make any connections in the
pump terminal box unless the
electrical supply has been switched
off.
Change the pump performance as follows:
1. Switch off the electrical supply to the pump
at the main circuit breaker.
The green indicator light in the terminal box
must be off.
2. Remove the terminal box cover by loosening
the four screws in the cover.
3. Pull out the speed switch module and
re-insert it so that the desired speed is
visible through the window in the terminal
box (see fig. 14).
10
Three-phase
pumps
approx. 70 %
approx. 85 %
100 %
H
2 3
Q
Q
SPEED SPEED
1 2
Fig. 14 Speed switch module
When changing to and from speed 1,
the cover of the speed switch module
Note
must be removed and fitted on the
other side of the switch.
4. Fit the terminal box cover back onto the
terminal box and tighten the four screws in
the cover.
5. Switch on the electrical supply.
Check that the green indicator light is
permanently on or flashing.
The speed switch module must never
Note
be used as an on/off switch.
SPEED
3