Figure 58 - Service Side Cover - Danfoss Turbocor VTT Series Service Manual

Figure 58 - Service Side
Cover
64 of 165
M-SV-VT-001-EN Rev. A
Compressor Components
Stator Resistance Verification
To verify the Stator resistance, complete the following steps:
1. Isolate the Compressor power as described in the
section of this manual.
2. Remove the Motor Power Cover.
3. Remove the three (3) M10 nuts and flat washers off the top of the copper spacers.
4. Remove motor power cables. Protect/isolate the cable ends.
5. Using a multimeter, set for resistance measurements and place the red (+) multimeter lead on
one of the three (3) motor bus bar posts and the black (-) multimeter lead on another motor
bus bar post 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.
6. Repeat Step 5 for the remaining combinations of Motor Bus Bars to ensure all windings are
intact.
7. Connect the motor power cables.
8. Install the three (3) M10 nuts and washers on the studs above the copper spacers and power
cables, then torque to specification.
9. Restore power to the Compressor.
Stator Thermistor Resistance Verification
Two (2) resistance temperature detectors (RTDs) are embedded into the Stator in separate locations.
Each of these sensors contain a distinct circuit (circuit one and circuit two) that must be tested
individually. These embedded RTDs are permanently mounted in the Stator and cannot be serviced in
the field.
1. Isolate the Compressor power as described in the
section of this manual.
2. Remove the Service Side Cover.
"Electrical Isolation of the Compressor/VFD"
"Electrical Isolation of the Compressor/VFD"
Service Side Cover
Screws
Torque to 6 Nm
(53 in.lb.) (8 places)