Danfoss Turbocor TT-300, Руководство по обслуживанию, Страница: 100 / 132

100 of 132 M-SV-001-EN Rev.E
Table 22 - Compressor Faults
Compressor Fault
Description
Trigger
Method
Troubleshooting
High Inverter
Temperature Fault
AFT
Indicates the Inverter cooling is insufficient.
If this fault occurs three times within a 30-minute period, a Lock-Out Fault will occur.
CAUTION: Repeated occurrences of this alarm can result in Inverter failure.
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. See Section 3.12.3.
Verify the solenoid actuators. See Section 3.12.3.
Verify the Serial Driver. See Section 3.11.3.
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
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. See Section 3.20.3.
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.
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 See Section 3.12.3.
Verify the solenoid actuators. See Section 3.12.3.
Verify the Serial Driver. See Section 3.11.3.
Verify cavity temperature sensor. See Section 3.19.3.
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.
High Pressure Ratio
Fault
AFT
Suggests the condenser may be faulty, not enough load on the evaporator, or insufficient water flow in either
condenser or evaporator.
Check the condenser, evaporator loads and water flow.
Review the fault log for suction and discharge pressures and other conditions that are recorded at the time of
fault.
Bearing/Motor Fault
Active
INS
If a Motor Fault type or a Bearing Fault type is present, the Generic Compressor Fault is triggered.
This is not an actual fault, only an indication that a fault has occurred in the Motor or Bearing section. See Table 23
(Motor Faults) and Table 20 (Bearing Fault Types).
Troubleshooting