14
ELECTRICAL CONNECTIONS AND WIRING
Voltage application
range
Soft starters
Starting current of Danfoss MPZ 3-
phase compressors can be reduced by
using a Danfoss electronic soft starter.
The starting current can be reduced
by up to 50% depending on the
compressor model. Also mechanical
stresses that occur at starting are
reduced which increases the life of the
internal components.
For details of the Danfoss CI-tronic™
MCI soft starters, please refer to
literature DKACT.PD.C50.
Use of a soft starter requires that the
number of starts is limited to 6 per
hour. HP/LP pressure equalisation is
required before starting.
Terminal box
The MPZ terminal box has 1/4" faston
terminal tabs for power supply.
Note the C, S & R positions which are
diff erent from those in MTZ series
compressors.
The main entry is at the bottom side
through the rubber cable gland,
however a Ø 21 mm knock out at the
left side can be used for additional
cable entry. The terminal box IP rating
according to CEI 529 is IP54 provided
that adapted diameter cable is used.
The rubber cable gland internal
diameter is 12 mm. For instance
cable reference H07RN-F 4G2.5 is well
adapted to this cable gland.
C
S
R
Rubber cable
gland
Knock out Ø 21
1/4” tabs
Earth M4 x 12
Motor Code
Nominal voltage
Voltage application range
1
208 - 230 V / 60 Hz
187 - 253 V
3
200 - 230 V / 60 Hz
180 - 253 V
4
380 - 400 V / 50 Hz
340 - 440 V
460 V / 60 Hz
414 - 506 V
5
230 V / 50 Hz
207 - 253 V