1.8 Electrical Isolation
Before servicing the Compressor, isolate the compressor power by completing the following steps:
• • • DANGER! • • •
l
This equipment contains hazardous voltages that can cause serious injury or death. Only qualified and trained personnel
should work on Danfoss LLC equipment.
l
Always wear appropriately-rated safety equipment when working around equipment and/or components energized with
high voltage.
l
Removing the Mains Input Cover will expose the technician to a high voltage hazard of up to 632 VAC. Ensure the Mains
Input power is turned off and locked out before removing the Mains Input Cover.
1. Turn off the Mains Input power to the compressor.
2. Lock Out/Tag Out (LOTO) the mains disconnect to ensure no accidental or unauthorized reapplication
of the Mains Input power can occur.
NOTE
The Mains Input fast-acting fuses are installed in the power panel for all compressor models except the TTS300/TGS230.
3. Remove the Mains Cover only. Refer to Section 4.1.1 Mains Input Cover on page 52.
4. Using an appropriately-rated voltage meter, confirm the absence of AC voltage.
• • • DANGER! • • •
Do not touch any components when removing the Mains Input Cover.
5. If AC voltage is not present, reinstall the Mains Input cover and wait at least 20 minutes before
removing either the Mains Input or Top Side Cover. If AC voltage still exists, go back to Step 2 to
determine why the compressor voltage is not isolated.
6. Remove the Top Cover, taking particular care not to touch ANY components underneath. Refer to
Section 4.1.2 Top Cover on page 53.
7. Using an appropriately-rated voltage meter, check the DC Bus Bars for DC voltage level. If the voltage is
above 30 volts direct current (VDC), wait five (5) minutes and recheck until voltage is below 30 VDC.
Refer to Figure 1-6 DC Bus Voltage Test Points on page 23.
• • • CAUTION • • •
Even at low voltages, caution should be used around the capacitors to avoid quick discharge events, which can lead to reduced reliability.
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Summary of Contents for Turbocor TT Series
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