Control Of Single-Phase Ms; Connection Of Single-Phase Motors - Grundfos MS Montage- Und Betriebsanleitung

5.5 Control of single-phase MS 402

Warning
Single-phase MS 402 submersible
motors < 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.

5.6 Connection of single-phase motors

5.6.1 2-wire motors
MS 402 2-wire motors incorporate motor protection
and a starter device and can therefore be connected
directly to the mains. See fig. 9.
Fig. 9 2-wire motors
14
5.6.2 PSC motors
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
MS 402 PSC motors < 1.1 kW incorporate motor
protection and must be connected to the mains as
shown in fig. 10.
Fig. 10 PSC motors
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