Electrical installation of compressor and frequency inverter
This chapter covers some important aspects to be considered when installing and commissioning an external frequency inverter.
- For frequency inverters not manufactured by Bitzer: Please refer also to the respective operating instructions!
- For the Bitzer Varipack frequency inverter, see Operating Instructions CB-110. It also explains in detail electrical connections and control functions.
- Schematic wiring diagrams for various compressors with frequency inverter are compiled in the Technical Information AT-300.
For further information, see also ASERCOM Guidelines "Recommendations for using frequency inverters with positive displacement refrigerant compressors", chapter 6.
State of delivery of compressor:
CAUTION
The compressor is filled with a protective charge: Excess pressure 0.2 .. 0.5 bar nitrogen.
Risk of injury to skin and eyes.
Depressurise the compressor!
Wear safety goggles!
For work on the electrical system:
WARNING
Risk of electric shock!
Before working on the terminal box, module housing and electrical lines: Switch off the main switch and secure it against being switched on again!
Close the terminal box and the module housing before switching on again!
CM-RC-01:
The compressor module may be damaged or fail!
Never apply any voltage to the terminals of CN7 to CN12 – not even for test purposes!
The voltage applied to the terminals of CN13 must not exceed 10 V!
The voltage applied to terminal 3 of CN14 must not exceed 24 V! Do no apply voltage to the other terminals!
CM-RC-02:
The compressor module may be damaged or fail!
Never apply any voltage to the terminals of CN1 to CN6, CN11, CN12 and CN23 to CN28 – not even for test purposes!
The voltage applied to terminals 1 and 2 of CN23 must not exceed 10 V!
The voltage applied to terminal 3 of CN1 must not exceed 24 V! Do no apply voltage to the other terminals!
For work on the frequency inverter (FI):
DANGERWrong or insufficient earthing may result in life-threatening electric shocks upon contact with the frequency inverter!
Earth the complete frequency inverter permanently and check the earth contacts at regular intervals!
Prior to any intervention in the device, check all voltage connections for proper isolation.
Operating the frequency inverter at high temperatures leads to stress and reduced lifetime!
Take into account the maximum ambient temperatures at the place of installation.
Observe the minimum clearances for ventilation.