- Phone：0086-4006769700 / 021-57406070
- Fax：0086-021-57406123
- Email：4006769700@sunny-hvac.com
- Address：No.128 Huian Road Wuqiao Industrial Park Fengxian District Shanghai China
The following items need to be checked before running the water-cooled screw chiller:
Inspection of water-cooled screw chiller power supply and electronic control instrument system
1) Before the water-cooled screw chiller is turned on for the first time, check whether the power distribution capacity matches the unit power, and whether the selected cable diameter can withstand the maximum working current of the host.
2) Check whether the electrical system is consistent with the unit. The unit is electrically: three-phase five-wire system (three phase lines, one neutral line, one ground line, 380V±10%).
3) Check if the power supply line of the compressor is connected tightly. If it is loose, retighten it. The torque at the compressor wiring is 500kg.cm. Due to factors such as long-distance transportation and lifting, the screws may be loose. Failure to do so may result in damage to electrical components (such as air switches, AC contactors, etc.) and compressors in the main control cabinet.
4) Use a multimeter to carefully inspect all electrical circuits, check that the wiring is properly installed in place; use megaohms to make sure that there is no case short circuit; check that the ground wire is properly installed in place, and the insulation resistance to ground is greater than 2MΩ; check that the power cord meets capacity. Claim.
5) Check if the disconnect switch is installed on the power supply line of the supply unit.
6) All the wiring of the main circuit in the control cabinet and the external wiring of the control circuit can be energized after comprehensive inspection (such as crankcase oil heater, compressor electronic protector, circulating water temperature sensor, target flow switch wiring, water pump) Joint control, etc.); Check if the terminal bolts are tightened and there is no looseness. Check whether the electronic control instruments and electrical appliances are correctly installed, complete and effective, and check whether the wiring inside and outside the electrical control cabinet is clean and free of debris.
7) After checking the above items, the power indicator light is on when the control cabinet is energized. At this time, the oil heater starts to work, and observe whether the phase sequence protector is normal. If the phase sequence protector is normal (green light is on), close the single pole switch in the control cabinet. (QF2) The control loop starts working, and the touch screen (text display) and PLC controller are all put into operation.
8) Before the water-cooled screw chiller starts, check whether the external system of the unit meets the starting conditions (for example, whether the system cold water pump and cooling water pump are external control or main interlock, the external control needs to open the water pump before opening the main engine.