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Verify the DC-DC Converter. Refer to Section 4.24.2 DC-DC Converter Verification on page 204.
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Verify the PWM. Refer to Section 4.28.3 PWM Verification on page 226.
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Verify the bearings. Refer to Section 4.29.3 Bearing Verification on page 230.
3. An open F2 fuse may indicate a problem with the Potted DC-DC Converter.
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Verify the DC-DC Converter 15VAC input resistance (Potted DC-DC only). Refer to Section 4.24.2.3
Input Resistance Measurement on page 205.
4. An open F3 or F6 fuse may indicate a problem with the Soft Start Circuit Board.
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Verify the SCRs and SCR gates. Refer to Section 4.18.2.1 Diodes Verification - Two-Hole Mount on
page 142.
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Replace the fuse.
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Reapply power.
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If the fuse fails again, replace the Soft Start.
5. An open F4 or F5 fuse may indicate a problem with the Soft Start Transformers, Soft Start Circuit Board,
or DC-DC Converter.
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Verify the DC-DC 15VAC input resistance (Potted DC-DC only). Refer to Section 4.24.2.3 Input
Resistance Measurement on page 205.
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Verify the SCRs and SCR gates. Refer to Section 4.18.2.1 Diodes Verification - Two-Hole Mount on
page 142.
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If no faulty component is identified, replace the fuse and reapply power.
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If the fuse fails again, replace the Soft Start. Refer to Section 4.14.3 Soft Start Removal and
Installation on page 117.
5.5.3 Troubleshooting an Open Interlock
1. Verify the interlock. Refer to Section 4.3.2.3 Interlock Verification on page 63.
2. Ensure there is no external power applied on the interlock circuit.
3. If the Interlock circuit is determined damaged and will not close, remove the wire from the I/LOCK-
(neg) at the J2 connector of the I/O Board.
4. Move the wire to the SPEED-(neg) at the J2 connector of the I/O board.
5. This will allow the interlock circuit to close until a replacement BMCC is installed.
6. After replacing the BMCC (refer to Section 4.27 BMCC on page 220), replace the wire to the I/LOCK-
(neg) at the J2 connector of the I/O board.
5.5.4 Troubleshooting the Inverter
• • • CAUTION • • •
Repeated rotor may be locked or single phase over current faults can cause shaft demagnetization. It is important to repair an Inverter
failure before the compressor is damaged beyond field repair.
1. Download the fault and event log.
2. Review the fault and event log for any “Inverter Error” faults.
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Presence of an “Inverter Error” fault indicates probable failure of the Inverter. Replace the Inverter.
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If no “Inverter Error” fault is present, continue with the next step.
3. Verify the Inverter. Refer to Section 4.22.2 Inverter Verification on page 176.
4. If the Inverter verification passes, but he compressor will not run, refer to Section 4.23.4.1 Stator
Insulation Verification on page 195 and Section 4.23.4.2 Stator Resistance Verification on page 195.
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Summary of Contents for Turbocor TT Series
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