HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
HRS Series
3.3 Troubleshooting
3-41
6.
Check the power board.
Check that the power is being supplied to the pump.
Disconnect the connector "CN3" of the power board to which the pump cable is connected.
Check if power supply voltage is being supplied to the "CN3" connector (Pin No. 1 and No.2) of the
power board with a tester while the pump makes an isolated operation (by pressing "RUN/STOP"
key and "MENU" key simultaneously).
[Power supply voltage to be supplied]
- -10 (100V spec.): Single phase 100 VAC (50/60Hz), or 115 VAC (60Hz)
- -20 (200V spec.): Single phase 200 VAC to 230 VAC (50/60 Hz)
7.
Check the circulating fluid pressure sensor.
Install a pressure gauge, valve, and flow meter to the Thermo-Chiller in the same way as in step "3.
Check the pump performance". Compare the circulating fluid discharge pressure of the
Thermo-Chiller with the value measured by the pressure gauge in the following procedure.
(1) Display the circulating fluid discharge pressure "P1" on the Operation Panel of the
Thermo-Chiller.
(2) Perform an isolated operation of the pump (by pressing "RUN/STOP" key and "MENU" key
simultaneously) to check if the value measured by the pressure gauge and the value displayed
by the Thermo-Chiller are within the range provided below. If they are, the circulating fluid
pressure sensor is operating correctly.
Pressure "P1" displayed by the Thermo-Chiller = Pressure measured by the pressure gauge +/- 0.07 MPa
8.
Check the circulating fluid pressure sensor after it is replaced.
Replace the circulating fluid pressure sensor (for discharge). (See section "4.5.8 Replacement of
pressure sensor")
After replacing the sensor, operate the Thermo-Chiller and confirm that the alarm does not go off
again.
Fig. 3.3-26 Check the pump input
