– 12 –
Inverter Compressor
The new inverter compressor is not controlled by
120 VAC output from the main control board, as in
previous models. The compressor is controlled by
the inverter.
Warning: Disconnecting the 6-pin connector
does not disconnect power (120 VAC) from the
inverter. The refrigerator must be unplugged
before servicing the inverter or compressor.
Caution: Do not attempt to direct-start the
compressor. The compressor operates on a
3-phase power supply. Applying 120 VAC to the
compressor will permanently damage the unit.
It is not possible to start the compressor
without an inverter.
The compressor is a reciprocating, variable speed,
4-pole type. It operates on 3-phase, 80 to 230 VAC
within a range of 57 to 104 Hz. Compressor speed
is controlled by voltage frequency and pulse width
modulation. Increasing frequency from the inverter
will produce an increase in compressor speed.
•
Frequency of 57 Hz will produce low speed operation at 1710 rpm.
•
Frequency of 70 Hz will produce medium speed at 2100 rpm.
•
Frequency of 104 Hz will produce 3120 rpm.
Note: Certain voltmeters will not be able to read voltage output or frequency from the inverter.
Compressor wattages at various speeds are:
•
LOW - 65 watts
•
MED - 100 watts
•
HIGH - 150 watts
BTU rating also varies according to operating speed.
Compressor speed is based on the temperature setpoint in conjunction with the cabinet temperature.
Speeds are selected according to the following cabinet temperatures:
• 8 °F to 19.5 °F above setpoint = high speed
• 3.5 °F to 7.5 °F above setpoint = medium speed
• 1 °F to 3 °F above setpoint = low speed
Note: The compressor will run at medium speed if the cabinet temperature is 20 °F or more above the
setpoint.
The use of 3-phase power eliminates the need for the PTCR relay, capacitor, and individual start and run
windings; therefore the start, run, and common pins found on conventional compressors are not
applicable on this 3-phase model. Compressor pin functions are identical and compressor lead wire
configuration is of no importance. A resistance of 9 to 11
Ω
should be read between any 2 of the 3 pins.
Should an open occur in the compressor winding or should one of the compressor lead wires become
open or disconnected, the inverter will stop voltage output to the compressor.
J4-3
J4-
2
J3-
10
BLACK
BROWN
BLUE
BLACK
BLUE
BROWN
ORANGE
ORANGE
O
R
A
N
GE
PURPLE
COMPRESSOR
INVERTER
TA
B
4
BROWN
10
Ω
10
Ω
10
Ω
LOW VOLTAGE DC
CLASS 2 CIRCUITS
MAIN CONTR
O
L BO
ARD
AC
CURRENT-SOURCE
CIRCUIT BOARD
LINE VOLTAGE
6-PIN
CONNECTOR
+12 VDC
COMMON
GEA01260
Summary of Contents for PSH23SGNAFBS Series
Page 42: ... 40 Schematic 2 1 3 ...
