5.5.2.3 Determine if PWM is Draining Energy
1. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
2. First, follow the procedures in Section 5.5.2.1 Determining if Serial Driver is Draining Energy and
Section 5.5.2.2 Determining if BMCC is Draining Energy.
3. Isolate the compressor power as described in the 1.8 Electrical Isolation.
4. Wait for the LEDs on the Backplane to turn off.
5. Remove the Serial Driver (refer to Section 4.26.4 Serial Driver Removal and Installation on page 218)
and BMCC (refer to Section 4.27 BMCC on page 220).
6. Re-apply the compressor power and then test the Backplane voltages at the HV+, +17HV, +24V, +15,
+5, and -15 VDC test points.
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If all voltages are within (+/- 10%) the PWM is not draining energy
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If any of these voltages are not within (+/- 10%) proceed to Step 5
7. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
8. Wait for the LEDs on the Backplane to turn off.
9. Verify the PWM diodes. Refer to Section 4.28.3.3 Verify Functionality of the Five Diode Sets on page
10. Remove the PWM (refer to Section 4.28.4.1 PWM Amplifier Removal on page 228) (keep the Inverter
cable connected).
11. Verify the bearings. Refer to Section 4.29.3.1 Bearing Coil Verification on page 230.
12. Verify the bearing sensors. Refer to Section 4.30.3 Bearing Sensor Verification on page 236.
13. Re-apply the compressor power.
14. Test the Backplane voltages at the HV+, +17HV, +24V, +15, +5, and -15 VDC test points.
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If all voltages are within (+/- 10%) the PWM is draining energy
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If any of these voltages are not within (+/- 10%) another component is draining energy
5.5.2.4 Determining if Inverter is Draining Energy
1. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
2. Test the Backplane voltage at the +24V test point.
3. While measuring the +24V test point voltage, give the compressor the demand to run.
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If the +24V reading drops below 22VDC at the moment the demand to drive is given, the Inverter is
faulty
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If the +24V reading does not change at the moment the demand to drive is given, another
component is draining energy
5.5.2.5 Determining if Compressor I/O Board is Draining Energy
Refer to Section 4.3.2.1 Determining if the Compressor Interface Module is Draining Energy on page 62.
5.5.2.6 Determining the Cause of Blown Soft Start Fuses (Closed-Top Soft Start Only)
NOTE
Refer to Section 4.14.2.2 Verifying Soft Start Fuses on page 116 for details on verifying Soft Start fuses.
1. Verify the Soft Start fuses. Refer to Section 4.14.2.2 Verifying Soft Start Fuses on page 116.
2. An open F1 fuse may indicate a problem with the DC-DC or a component connected to its outputs.
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Using the DC Bus Test Harness, verify the DC-DC Converter high voltage input. Refer to Section
4.24.2.1 Input Voltage Verification on page 204.
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Summary of Contents for Turbocor TT Series
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