Danfoss TGH285, Руководство по обслуживанию

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M-SV-001-EN Rev. G
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 "Table 5-6
Compressor Status", "Table 5-8 Motor Status", and "Table 5-9 Bearing Status".
Table 5-6 Compressor Status
Motor Fault
Description
Trigger
Method
Troubleshooting
High Inverter
Temperature Fault
AFT • Indicates the Inverter cooling is insufficient. Repeated occurrences of this alarm can result in Inverter failure.
• If this fault occurs three times within a 30-minute period, a Lock-Out Fault will occur.
• Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
• Prevent prolonged operation at a pressure ratio less than 1.5.
• Verify the solenoids are operational and not blocked. Refer to "4.7.3 Solenoid Verification" on page 73.
• Verify the solenoid actuators. Refer to "4.7.3 Solenoid Verification" on page 73.
• Verify the Serial Driver. Refer to "4.27.3 Serial Driver Verification" on page 213.
• The measured Inverter temperature must drop below the Maximum Drive Startup 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.
• Review the fault log for actual Inverter temperature and other conditions that are recorded at the time of fault.
• The temperature sensor embedded in the Inverter requires a replacement of the Inverter if determined faulty.
High Discharge
Temperature Fault
AFT
AFT • Suggests insufficient charge (i.e., low gas), the condenser temperature has increased, check valve has failed to
open or the compressor has been running in surge condition for an extended period of time.
• Check the chiller gas charge, entering condenser air/water conditions and operational settings.
• Verify check valve opens during compressor operation.
• Verify the discharge pressure/temperature sensor. Refer to "4.33.3 Pressure/Temperature Sensor Verification" on
page 234.
• Review the fault log for actual discharge temperature; compare actual speed to surge speed, and other conditions
that are recorded at the time of fault.
Low Suction
Pressure
Fault
DFT • Suggests insufficient charge, insufficient system load, or a sudden drop in evaporator entering air/water
temperature or flow.
• Check the charge, system load and entering air/water conditions.
• Review the fault log for actual suction pressure, entering air/water temperature (if available) and other conditions
that are recorded at the time of fault.
High Discharge
Pressure Fault
AFT • Suggests the condenser may be faulty or insufficient water flow.
• Check the condenser and water flow.
• Review the fault log for actual discharge pressure and other conditions that are recorded at the time of fault.
• Results in an Instantaneous Lock-Out Fault.
3-Phase
Over-Current
Fault
AFT • Indicates the compressor is drawing current greater than the 3-Phase Current Fault Limit.
• Review the fault log for recorded 3-Phase Current level, demand, entering air/water temperature (if available) and
other conditions that are recorded at the time of fault.
• Usual causes are Start speed set too high (particularly in conjunction with IGV start position setting too low),
minimum pressure ratio set high, power control integral (loop) gain set too high. Can also be related to sudden
increase in load/demand or system changes.
• During startup mode, all alarms are ignored by the control system, but faults are not. Therefore, when the FLA
current (3-Phase Alarm Limit) is reached, the compressor will continue to accelerate if startup requirements are not
satisfied. After Startup is complete, alarms will slow the compressor speed.
• Results in an Instantaneous Lock Out Fault. Requires a power cycle to reset.
High Cavity
Temperature Fault
AFT • Indicates the motor cooling is insufficient.
CAUTION : Repeated occurrences of this fault can result in shaft demagnetization or Back EMF is low faults.
• Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
• Prevent prolonged operation at a pressure ratio less than 1.5.
• Verify the solenoids are operational and not blocked. Refer to "4.7.3 Solenoid Verification" on page 73.
• Verify the solenoid actuators. Refer to "4.7.3 Solenoid Verification" on page 73.
• Verify the Serial Driver. Refer to "4.27.3 Serial Driver Verification" on page 213.
• Verify cavity temperature sensor. Refer to "4.32.3 Cavity Temperature Sensor Verification" on page 232.
Low Leaving Fluid
Temperature Fault
DFT • Suggests insufficient water flow or insufficient system load.
• Check water flow and system load.
• Verify leaving fluid temperature sensor.
• Ensure LEAVE jumper is installed on the I/O board.
• Review the fault log for entering and leaving air/water temperature (if available) and other conditions that are
recorded at the time of fault.