Grundfos VersaFlo UPS, Installation And Operating Instructions Manual

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4.2 Check the direction of shaft rotation
Applies to 460 V and 575 V two-speed models
only
(The direction of rotation of three-speed pumps is
checked by means of the fault finding chart, pages
11 and 12).
1. Make sure that the power is OFF.
2. Unscrew and remove the vent plug located at the
center of the nameplate.
3. Insert a small, flat-blade screwdriver into the slot
in the end of the motor shaft (see fig. 12). Rotate
the shaft with the screwdriver to make sure it
does so freely.
4. Bump the pump and watch to see which direction
the shaft rotates. The shaft must rotate in the
counterclockwise direction as shown on the
nameplate (see fig. 11).
5. If the pump shaft is rotating incorrectly, discon-
nect the power and interchange any two power
leads in the terminal box.
6. Check once again for proper counterclockwise
rotation. When it is rotating correctly, replace the
vent plug.
Fig. 11 Vent plug and direction of rotation
Fig. 12 Removing the vent plug
4.3 Speed selection
4.3.1 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).
Changing to lower speeds offers considerable reduc-
tion in energy consumption and less noise in the sys-
tem.
Fig. 13 Pump performance at speed settings
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).
Fig. 14 Speed switch module
TM
03
77
50
48
06
T
M
03
72
77
47
06
Vent plug Direction of
rotation
Inspection screw
Inspection screw/
vent plug
Switch
position
Speed in % of maximum speed
Single-phase
pumps
Three-phase
pumps
1 approx. 60% approx. 70%
2 approx. 80% approx. 85%
3 100% 100%
TM
03
77
36
48
06
WARNING!
Never make any connections in the pump
terminal box unless the electrical supply
has been switched off.
TM
0
3
7
735
4
806
H
Q
1 2
Q
H H
Q
3
H = head and Q = flow
SPEED
1
SPEED
2
SPEED
3