111 of 132
M-SV-001-EN Rev.E
Troubleshooting
4.5.2 Determining the
Cause of an Energy Drain
4.5.2.1 Determining if
Serial Driver is Draining
Energy
4.5.2.2 Determining if
BMCC is Draining Energy
4.5.2.3 Determining if
PWM is Draining Energy
1. Remove the Service Side Cover.
2. Test the Backplane voltages at the +24V, +15,
+5, and -15 VDC test points.
• If all voltages are /- 10%, the Serial
Driver is not draining energy.
• If any of these voltages are not /- 10%),
proceed to Step 3.
3. Isolate the compressor power and wait for the
LEDs on the Backplane to turn off.
4. Remove the Serial Driver.
5. Re-apply the compressor power
6. Test the Backplane voltages at the +24V, +15,
+5, and -15 VDC test points.
• If all voltages are /- 10%, the Serial
Driver is draining energy.
• If any of these voltages are not /- 10%,
another component is draining energy.
1. Remove the Service Side Cover.
2. First, follow procedure Section 4.5.2.1.
3. Isolate the compressor power and wait for
the LEDs on the Backplane to turn off and then
remove the Serial Driver. See Section 3.11.4.1.
4. Re-apply the compressor power and test the
Backplane voltages at the +24V, +15, +5, and -15
VDC test points.
• If all voltages are within (+/- 10%) the BMCC is
not draining energy.
• If any of these voltages are not within (+/- 10%)
proceed to Step 5.
5. Isolate the compressor power and wait for the
LEDs on the Backplane to turn off.
6. Remove the BMCC (see Section 3.14.4.1)
(ensure the Inverter cable remains connected).
7. Re-apply the compressor power
8. Test the Backplane voltages at the +24V, +15,
+5, and the -15 VDC test points.
• If all voltages are within (+/- 10%) the BMCC is
draining energy.
• If any of these voltages are not within (+/- 10%)
another component is draining energy.
1. Remove the Service Side Cover.
2. First, follow procedure Section 4.5.2.1 and
Section 4.5.2.4.
3. Isolate the compressor power and wait for
the LEDs on the Backplane to turn off and then
Remove the Serial Driver (see Section 3.11.4.1)
and BMCC (see Section 3.14.4.1).
4. Re-apply the compressor power and then test
the Backplane voltages at the HV+, +17HV, +24V,
+15, +5, and -15 VDC test points.
• If all voltages are within (+/- 10%) the PWM is
not draining energy.
• If any of these voltages are not within (+/- 10%)
proceed to Step 5.
5. Isolate the compressor power and wait for the
LEDs on the Backplane to turn off.
6. Verify the PWM diodes. See Section 3.16.3.3.
7. Remove the PWM (Section 3.16.4.1) (keep the
Inverter cable connected).
8. Verify the bearings and bearing sensors (see
Section 3.18.3).
9. Re-apply the compressor power
10. Test the Backplane voltages at the HV+,
+17HV, +24V, +15, +5, and -15 VDC test points.
Summary of Contents for Turbocor TT-300
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