Eng
lish (US)
14
11. Electrical connection
The electrical connection should be carried out in accordance
with local regulations.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor is suitable for the power
supply available at the installation site.
The pump must be connected to a motor-protective circuit
breaker.
P1, P2 and P3 are connected in series with the thermal protectors
and moisture sensors.
The wiring for the start/stop circuit must be according to fig. 13 or
fig. 14.
Fig. 13
Wiring diagram for DOL start
Fig. 14
Wiring diagram for Y/D start
12. Startup
12.1 Before startup
Turn the propeller or impeller by hand (clockwise seen from the
motor side). See fig. 15.
• Check that the supply voltage and frequency correspond to
the values stated on the pump nameplate. If not, do not start
the pump.
• Check that the outer cable sheath is intact so that water
cannot enter the terminal box through the cable. If refitting the
cable, cut off a short piece to ensure that the cable entry
sealing sleeve does not clamp around the cable at the same
point again.
• Check that cable entry sealing sleeve and washers
correspond to the outside diameter of the cable. When
preparing power cable leads for connection to the pump and
control panel, it is essential that the ground (earth) lead is at
least two inches longer than the other leads after connection.
This is to ensure that if the cable is accidentally pulled out, the
ground (earth) lead connection will be the last to be
disconnected.
Your pump is delivered ready for connection to the voltage and
frequency on the nameplate and was factory-tested prior to
shipment.
12.2 Startup procedure
Procedure
1. Lock the mains switch in the 0/Off position.
2. Check the oil level in the oil chamber.
3. Check that the propeller or impeller can rotate freely.
4. Check whether the monitoring units, if used, are operating
satisfactorily.
5. Make sure that the pump is submerged in the liquid.
6. Open the isolating valves, if fitted.
7. Check the setting of the level switches.
8. Unlock the mains switch, start the pump and check the pump
operation for abnormal noise or vibrations.
When started, the motor will jerk the pump in the opposite
direction of the direction of rotation.
Warning
The pump must be connected to an external
mains switch with a contact separation according
to EN 60204-1, 5.3.2.
TM
05
9
167
41
1
3
TM
05 91
68 41
13
3~
U1 V1 W1
1
2
3
L2
L1
L3
U1 V1
W1
1
6
7
PE
5
4
3
2
Direct online starting (DOL)
L2
L1
L3
U1 V1 W1
1 2
3
U2 V2 W2
4 5 6
U1 V1 W1
1 2 3
L2
L1
L3
U2 V2 W2
4 5 6
V1
W1
U2
V2
W2
U1
1
6
7
PE
5
4
3
2
Star-delta starting (Y/D)
DELTA
STAR
Warning
Before manual starting or changeover to
automatic control, make sure that no persons are
working on or near the pump.
Caution
The resulting jerk of large pumps can be
powerful.
