.
9. Cooling water supply (only for ZR compressors):
Water flow and pressure to be adjusted depending upon local conditions. For cooling water
quality see Cooling water requirements. For maintenance purpose the cooling water in- and
outlet have to be provided with shut-off valves.
Note
All pipes must be connected stress-free to the compressor unit.
For more information concerning air nets, cooling systems, etc. refer to the compressor
installation manual.
4.4 Electric connections
Warning
To preserve the protection degree of the electric cubicle and to protect its components from
dust from the environment, it is mandatory to use a proper cable gland when connecting the
supply cable to the compressor.
Recommendations for variable speed units
Power distribution systems (TN, TT and IT)
According to IEC 60950 there are three main types of power distribution systems: TN, TT and IT.
The electrical installation instruction depends on the network type of the customer power supply.
If in any doubt of the network type, consult your Customer Centre.
General
The electrical equipment of the Compressor is designed according to the safety regulations
described in IEC60204-1 or CENELEC EN60204. It is the responsibility of the customers to install
the compressor unit according to the safety regulation in order to protect persons against electric
shock from direct or indirect contact.
In drives with frequency converter, leakage currents occur along the RFI filter and the cable
capacities, especially during the motor start. Class A leakage detection protections would switch
off the machine. Therefore, it is not recommended to use class A detection systems on frequency
converters.
Installation instruction TN, TT and IT
In each network system (TN, TT or IT), the customer has to protect the installation using:
• overcurrent protection by fuses
or
• automatic circuit breaker protection
Depending on the power distribution system an additional installation instruction is given:
• Network type TN (TN-S, TN-C and TN-C-S):
No additional protections have to be installed. If customers want to or have to install a
leakage detection device, it should be of type B and comply with IEC755 Amendment 2
(General requirements for residual current operated protective devices). It is advised to
Instruction book
48 API797429
To Next Page
Loading...
