Control Of Single-Phase Ms; Connection Of Single-Phase Motors; Connection Of Three-Phase Motors; Checking Of Direction Of Rotation - Grundfos SP Serie Montage- Und Betriebsanleitung

5.5 Control of single-phase MS 402

Warning
The single-phase MS 402 submersible motor
incorporates motor protection which cuts out the
motor in case of excessive winding temperatures
while the motor is still supplied with voltage.
Allow for this, when the motor forms part of a
control system.
If a compressor is included in a control system together with an
ochre filter, the compressor will run continuously once the motor
protection has cut out the motor, unless other special precautions
have been taken.

5.6 Connection of single-phase motors

5.6.1 2-wire motors
Grundfos MS 402 2-wire motors incorporate motor protection and
a starter device and can therefore be connected directly to the
mains, see fig. 11.
N
M
1
Fig. 11 2-wire motors
5.6.2 PSC motors
The PSC motors are connected to the mains via an operating
capacitor which should be sized for continuous operation.
Select the correct capacitor size from the following table:
Motor
0.25 kW
0.37 kW
0.55 kW
0.75 kW
1.10 kW
1.50 kW
2.20 kW
The Grundfos MS 402 PSC motor incorporates motor protection
and should be connected to the mains as shown in fig. 12.
N
M
1
Fig. 12 PSC motors
12
L
Capacitor
12.5 μF / 400 V / 50 Hz
16 μF / 400 V / 50 Hz
20 μF / 400 V / 50 Hz
30 μF / 400 V / 50 Hz
40 μF / 400 V / 50 Hz
50 μF / 400 V / 50 Hz
75 μF / 400 V / 50 Hz
L
C
See www.franklin-electric.com and fig. 13.
1
Fig. 13 Franklin submersible motors
5.6.3 3-wire motors
Grundfos MS 4000 3-wire motors should be connected to the
mains via a Grundfos control box SA-SPM 2, 3 or 5 incorporating
motor protection.
Grundfos MS 402 3-wire motors incorporate motor protection
and should be connected to the mains via a Grundfos control box
SA-SPM 2, 3 or 5 without motor protection.
The connection of MS 4000 and MS 402 motors appears from the
table below:
Motor Cable
Grey
Up to 0.75 kW, Brown
50 Hz Black
Yellow/green
Grey
From 1.10 kW, Brown
50 Hz Black
Yellow/green
Yellow
1.1 to 3.7 kW
Red
(~ 1.5 to 5.0 hp)
Black
60 Hz
Yellow/green

5.7 Connection of three-phase motors

Three-phase submersible motors must be protected, see section
5.2.2 Three-phase motors.
For electrical connection via the MP 204, see the separate
installation and operating instructions for this unit.
When a conventional motor starter is being used, the electrical
connection should be carried out as described below.

5.7.1 Checking of direction of rotation

The pump must not be started until the suction
Caution interconnector has been completely submerged
in the liquid.
When the pump has been connected to the electricity supply,
determine the correct direction of rotation as follows:
1. Start the pump and check the quantity of water and head
developed.
2. Stop the pump and interchange two of the phase connections.
In the case of motors wound for star-delta starting, exchange
U1 by V1 and U2 by V2.
3. Start the pump and check the quantity of water and head
developed.
4. Stop the pump.
5. Compare the results taken under points 1. and 3. The
connection which gives the larger quantity of water and the
higher head is the correct connection.
L N
C
M
Control box Mains
N
1 N
L
2 L
3 SA-SPM 2
PE
N
1 N
L
2 L
3 SA-SPM 3
PE
L1
Y L1
L2
R
L2
B SA-SPM 5
PE