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6.5 Control of single-phase MS 402 motors
Warning
The single-phase MS 402 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.
6.6 Connection of single-phase motors
6.6.1 2-wire motors
MS 402 2-wire motors incorporate motor protection and a starter
device and can therefore be connected direct to the mains.
See fig. 12.
Fig. 12 2-wire motors
6.6.2 PSC motors
The PSC motors are connected to the mains via a run capacitor
which should 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
Capacitor
[μF] 400 V, 50 Hz
12.5
16
20
30
40
50
75
MS 402 PSC motors incorporate motor protection and should be
connected to the mains as shown in fig. 13.
Fig. 13 PSC motors
See www.franklin-electric.com and fig. 14.
1
Fig. 14 Franklin motors
6.6.3 3-wire motors
MS 4000 3-wire motors must be connected to the mains via a
Grundfos SA-SPM 5 (60 Hz), 7 or 8 (50 Hz) control box
incorporating motor protection.
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 (60 Hz), 7 or 8 (50 Hz) without motor protection.
L
N
C
M
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