Grundfos SP Serie Instrucciones De Instalación Y Funcionamiento página 15

6.4 Control of single-phase MS402 motors
The single-phase MS402 motors smaller than 1.1 kW in-
corporate 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.
2-wire motors.
N
1 2
M
1
2-wire motors
1 Yellow and green
2 Blue
3 Brown
L
3
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
MS402 PSC motors smaller than 1.1 kW incorporate motor
protection and must be connected to the mains as shown in fig.
PSC motors.
N
1 2
M
1
PSC motors
1 Yellow and green
2 Grey
3 Brown
4 Black
Capacitor
[μF] 400 V, 50 Hz
12.5
16
20
30
40
50
75
L
C
4
3
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