SMC Networks HRS012-A-10 Series Service Manual page 75

Check the power board.
6.
Check that the power is being supplied to the fan motor.
Disconnect the connector "CN4" of the power board to which the fan/compressor cable is
connected.
Operate the Thermo-Chiller (by pressing "RUN/STOP" key), and check if power supply voltage is
supplied to the pins number 1 to number 3 of the "CN4" connector on the power board with a tester.
In this test, if voltage supply is confirmed only for a couple of seconds after the Thermo-Chiller is
started, it is normal.
Depending on the installation environment, power supply voltage may stop (or the voltage may drop
to approximately 10 VAC) in some seconds after starting the product operation, which is normal. If
the power supply voltage is not confirmed at the start operation, it is judged not to be normal.
[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)
Check the power board after replacement.
7.
Replace the power board .(See section "4.5.17 Replacement of power board)
After replacing the power board, confirm that all the items specified in step 6 have been checked.
Flow rate of the circulating fluid is less than 5 L/min.
8.
Install a flow meter, and check the flow rate of the circulating fluid.
9. Check the pump performance.
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.
HRS Series
Chapter 3
Fig. 3.3-35 Confirm the fan input
Alarm Indication and Troubleshooting
3.3 Troubleshooting
HRX-MM-N007
3-59