[文件標題] [日期]
38
Vol. 1.2 © 2020 Hanbell Precise Machinery Co., Ltd.
All rights reserved
3. Check the voltage supplied to Magnetic Controller from inverter is correct (VDC 350~750V). If
correct, input the power and make shaft levitated by controller. Before shaft is levitated, make sure to
reset all alarm messages.
Remark:
1. It is forbidden to run the compressor during checking process, even under vacuum circumstance.
2. The shaft must levitated 8 hours before starting if the compressor shouting down for 6 months.
SDR may shows error but not effecting the levitation. The time of levitation in proportion to the
shout off time, the compressor can be started after levitation. SDR error will be removed
automatically.
7.4 System requirement
1. System pipe has to be clean. It can’t be contaminated by welding debris or steel scrap, which can
cause damage to compressor.
2. Proper size of check valve should be installed in discharge pipe and the pressure drop should be as
small as possible. The pressure and temperature is high in discharge side, so the material and quality of
check valve has to be reliable.
3. If compressor is operated under humid circumstance, proper preservation and protection is
necessary.
4. If compressor is shut-down for a long term, especially in the winter, refrigerant tends to flow back
into compressor. Please check if refrigerant is accumulated in the compressor from sight glass before
start up the compressor. If necessary, the liquid returning angle-valve can lead the refrigerant to
evaporator.
7.5 Control requirement
1. In order to avoid motor over-heat, compressor is not allowed to start/stop frequently. The interval
between start/stop should be at least 10 minutes.
2. Discharge/Suction pressure sensor for calculating Surge equation has to be installed close to
Discharge/Suction port.
7.6 Others
A check valve is recommended to be installed close to condenser on discharge piping to prevent gas
back flow when emergency stop.
To Next Page
Loading...
