SMC Networks HRS012-A-10 Series Service Manual page 63

External load is out of the specification range.
1.
Cooling capacity varies depending on the ambient temperature, facility water temperature, set
circulating fluid temperature, and power supply frequency.
Please refer to the "Cooling capacity" graph shown in the Operation Manual.
2. Check the external piping.
Check if the external piping is in the conditions shown below:
(1) The system has a circuit that high temperature circulating fluid returns to the Thermo-Chiller at
once due to an operation of the valve or the switching valve in the external piping.
(2) The system has a circuit that the circulating fluid (60
waste heat of the workpiece that is cooled returns to the Thermo-Chiller at once when the
Thermo-Chiller starts operation.
3. Flow rate of the circulating fluid is less than 5 L/min.
Install a flow meter, and check the flow rate of the circulating fluid.
Check the pump performance.
4.
Install a flow meter. Refer to the "Pump capacity" graph" shown in the catalogue and check that the
pump capacity is suitable for the circulating fluid outlet pressure and the circulating fluid flow rate.
Check the compressor intake temp. sensor.
5.
Check for any difference between the actual compressor intake temperature and the temperature
detected by the compressor intake temperature sensor by following the instructions shown below:
(1) Stop the Thermo-Chiller and leave it not operating for 24 hours to make the temperature of the
temperature sensor itself be the same as the ambient temperature.
(2) Check the temperature shown for "t1: Circulating fluid discharge temperature" and "t3:
Compressor inlet temperature" in the "Check Monitor Menu" of the Thermo-Chiller.
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(3) If t3 = t1 +/- 3 C, it means that the compressor intake temperature sensor is operating correctly.
6. Check the compressor intake temp. sensor after replacement.
Replace the compressor intake temperature sensor with a new one. (See document No.
HRX-MM-Q016 for replacement instructions) After replacing, check that all the check items shown in
"5. Check the compressor intake temperature sensor." are correctly followed.
After stopping power supply, check for the same alarm goes off again when the
7.
chiller is re-started.
After stopping power supply (by tuning off the power supply switch of the Thermo-Chiller), check if
the same alarm goes off again when the Thermo-Chiller is restarted.
HRS Series
Chapter 3 Alarm Indication and Troubleshooting
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C or more) that has been heated by a
HRX-MM-N007
3.3 Troubleshooting
3-47