46 of 132
M-SV-001-EN Rev.E
Compressor Components
3.5.3.3 SCR Temperature
Sensor Verification
NOTE
The temperature sensor in the SCR manifold is a negative temperature coefficient (NTC) type 10KΩ @ 70°F (21°C).
1. Isolate compressor power and remove the
Service Side Cover.
2. Disconnect the SCR temperature sensor cable
plug (INTER - J17) from the Backplane Board.
3. Using a multimeter set for resistance
measurements, place the leads in terminal 1
and 2 of the cable plug. See Figure 36. The value
should correspond with an NTC thermistor 10KΩ
@ 70°F (21° C).
4. Place the multimeter leads in terminal 1 and 2
of the cable plug. The value should correspond
with an NTC 10KΩ @ 70°F (21°C).
1. Isolate the compressor power as described
in the “Electrical Isolation of the Compressor”
section of this manual.
2. Using needle-nose pliers, carefully remove the
SCR gate cable harness from the SCRs.
3. Remove the Soft Start and Soft Start Cable
Harness.
4. Remove the AC Mains Input bus bars, snubber
capacitors, and DC bus. See Figure 35 (SCR
Connections) and Figure 38 (DC Bus Components
Identification).
5. Remove the screws that secure the SCRs to the
cooling manifold.
6. Lift off the SCRs from the cooling manifold and
wipe clean the heat sink paste.
1. Isolate the compressor power as described
in the “Electrical Isolation of the Compressor”
section of this manual.
2. Using needle-nose pliers, carefully remove the
SCR gate cable harness from the SCRs.
3. Remove the Soft Start and Soft Start Cable
Harness.
4. Remove the AC Mains Input bus bars and
terminal block. See Figure 35 (SCR Connections).
5. Remove the DC bus and snubber capacitors.
See Figure 35 (SCR Connections).
6. Disconnect the SCR temperature sensor
connector from the cable harness.
7. (TT300/TG230 Only) Loosen the Inverter
manifold screws and lift the SCR manifold,
allowing the SCR temperature sensor cable to
pass under the SCR manifold.
8. Remove the SCR temperature sensor from the
SCR manifold.
Figure 37 - J17 Connector
3.5.4 Removal and
Installation
3.5.4.1 SCR Removal
3.5.4.2 SCR Temperature
Sensor Removal
• • • CAUTION • • •
It is recommended that all three SCRs be replaced when one is found faulty.
• • • CAUTION • • •
TT300/TG230 only:
Compressor must be isolated and refrigerant must be recovered before removing the SCR temperature
sensor.
Содержание Turbocor TT-300
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