Danfoss Turbocor TT Series Service Manual page 255

Figure 5-1 Fault Trigger Methods
Fault Reset: A fault that does not require a power cycle to clear (non-critical) can be reset in the following manner:
Interlock must be closed, set the Demand to "0" and afterwards to a value greater than 0. Now the fault is reset and
the compressor is ready to run. The assumption is that the cause of the fault has been rectified.
The Clear Faults button in the SMT Compressor Monitor can be used in software versions 4.0.0 and later. Also see the
OEM Programming Guide for additional fault reset options.
A fault demanding a power cycle (Lock-Out Fault) is resettable by cycling the mains power to the compressor. The
assumption is that the cause of the fault has been rectified. Refer to the following tables:
Table 5-6 Compressor Status
Compressor Status
Trigger Method
Description
High Inverter AFT
Temperature Fault
Table 5-6 C ompressor Status
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Table 5-8 M otor/System Status on page 260
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Table 5-9 B earing Status on page 263
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Troubleshooting
Consequence:
Indicates the Inverter cooling is insufficient. Repeated occurrences of this alarm can
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result in Inverter failure.
If this fault occurs three (3) times within a 30-minute period, a Lock-Out Fault will occur.
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The measured Inverter temperature must drop below the Maximum Drive Startup
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Temperature before a restart can be attempted, otherwise the Compressor Monitor Tool
Control Status message "Above drive temperature limit waiting to cool down" will be
displayed.
Recommendation:
Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
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Prevent prolonged operation at a pressure ratio less than 1.5.
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Verify the solenoids are operational and not blocked. Refer to Section 4.6.3 S olenoid
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Low Lift operation requires additional considerations, refer to the Applications
Manual
M-SV-001-EN Rev. H-1/23/2023 Page 255 of 294