Danfoss Mci Soft-Start Controller - Danfoss Performer SM Series Selection & Application Manuallines

electRical connections and WiRing
suggested wiring diagrams
Compressor models SY / SZ 240 - 300 - 380
A1
A3
A2
Wiring diagram with pump-down cycle
Legends
danfoss Mci
soft-start controller
* By-pass contactor (K1) required.
See application example p.16
Control device .........................................................TH
Optional short cycle timer (3 min) ................180 s
Control relay ............................................................KA
Liquid line solenoid valve ................................. LLSV
Compressor contactor .........................................KM
Safety lock out relay .............................................. KS
Pump-down control & L.P. switch ...................... BP
H.P. safety switch ....................................................HP
For Performer® scroll compressors
with motor code 4 (400V / 3 / 50Hz
or 460V / 3 / 60Hz) the inrush current
can be reduced by use of a Danfoss
digitally-controlled MCI compressor
soft starter. MCI soft starters are
designed to reduce the starting
and stopping current of 3-phase AC
motors; MCI soft starters can reduce
in-rush current by up to 40%, thereby
compressor model
SM / SZ 084
SM / SZ 090
SM / SZ 100
SM / SZ 110
SM / SZ 115 -125
SM / SZ 120
SM / SZ 160 - 161 - 148
SM / SZ 175 - 185
SY / SZ 240 - 300 - 380
A1
A3
A2
Wiring diagram without pump-down cycle
Fused disconnect ....................................................Q1
Fuses ...........................................................................F1
External overload protection ...............................F2
Compressor motor ...................................................M
Motor safety thermostat ................................... thM
Discharge gas thermostat.................................DGT
Motor protection module ............................... MPM
Thermistor chain .......................................................S
eliminating the detrimental effects
of high starting torque surges and
costly demand charges from the
resultant current spike. Upon starting,
the controller gradually increases the
voltage supplied to the motor until
full-line voltage has been reached. All
settings, such as ramp-up time and
initial torque, are preset at the factory
and do not require modification.
soft start reference
ambient max. 104°F
MCI 15C
MCI 25C
MCI 50CM
soft start reference
ambient max. 131°F
MCI 15C
MCI 25C
MCI 25C*
15