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4.24.3 Motor Connections
Refer to "Figure 4-244 Connection to Stator" for details on the connections and serviceable
components.
Figure 4-244 Connection to Stator
4.24.4 Motor Verification
4.24.4.1 Stator Insulation Verification
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Remove the Soft Start. Refer to "4.15.3 Soft Start Removal and Installation" on page 112.
3. Remove the Copper Tubes that connect the motor bus bars to the Inverter.
4. Using a mega-ohm meter set for 1000VDC measurements, connect the red (+) mega-ohm
meter lead to one of the three motor bus bars and the black (-) mega-ohm meter lead to
the compressor housing. The measured value should be greater than 100 mega-ohms. If the
measured value does not correspond to the expected resistance, then the Stator insulation is
faulty and the compressor needs to be replaced.
5. Repeat Step 4 for the remaining two (2) motor bus bars to ensure all windings are intact.
4.24.4.2 Stator Resistance Verification
To verify the Stator resistance, complete the following steps:
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Remove the Soft Start. Refer to "4.15.3 Soft Start Removal and Installation" on page 112.
3. Remove the Copper Tubes that connect the motor bus bars to the Inverter.
4. Using a multimeter set for resistance measurements, place the red (+) multimeter lead on one
of the three motor bus bars and the black (-) multimeter lead on another motor bus bar and
record the results. The measured value should be less than 1Ω but not zero. If the measured
value is 0.0Ω or greater than 1Ω, then the Stator winding is faulty and the compressor must be
replaced.
5. Repeat Step 4 for the remaining combinations of motor bus bars to ensure all windings are
intact.
High Power
Feedthrough
Motor Bus Bar
Motor Thermistor
Terminals
Inverter to Motor
Bus Bar fastener,
M8x70
(3 places)
• • • CAUTION • • •
Do not attempt to perform an insulation test on a component under vacuum. This can cause insulation breakdown or failure during the
testing process.
• • • CAUTION • • •
A faulty Stator can cause the Inverter to fail.
Summary of Contents for Turbocor TTS Series
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