Control Of Single-Phase Ms402 Motors; Connection Of Single-Phase Motors - Grundfos SP Series Installation And Operating Instructions Manual

6.4 Control of single-phase MS402 motors

The single-phase MS402 motors smaller than 1.1 kW
incorporate 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.

6.5 Connection of single-phase motors

6.5.1 2-wire motors
MS402 2-wire motors incorporate motor protection and a starter
device and can therefore be connected direct to the mains. See
fig. 10.
1 2
Fig. 10 2-wire motors
1 Yellow and green
2 Blue
3 Brown
6.5.2 PSC motors
The PSC motors are connected to the mains via a run capacitor
which must be sized for continuous operation.
Select the correct capacitor size from the table below:
Motor
[kW]
0.25
0.37
0.55
0.75
1.10
1.50
2.20
10
3
Capacitor
[μF] 400 V, 50 Hz
12.5
16
20
30
40
50
75
MS402 PSC motors smaller than 1.1 kW incorporate motor
protection and must be connected to the mains as shown in fig.
11.
2
1
Fig. 11 PSC motors
1 Yellow and green
2 Grey
3 Brown
4 Black
6.5.3 3-wire motors
MS402 3-wire single-phase motors incorporate motor protection
and must be connected to the mains via a Grundfos control box
SA-SPM 50 Hz or 60 Hz without motor protection.
MS4000, MS6000 3-wire single-phase motors must be connected
to the mains via a Grundfos SA-SPM 50 Hz or 60 Hz control box
incorporating motor protection.
When a conventional motor-protective circuit breaker is used, the
electrical connection must be carried out as described below.
N
1 2
1
Fig. 12 CSIR
N L
1 2
1 2 3
1
Fig. 13 CSCR
3
4
L
Cs
3 4
Cs Cr
3 4
4