A maximum distance of 50 mm should never be exceeded.
Distances between units and walls stated are minimum.
2. The ventilation of the unit room has to be suitable for all installed units. Avoid recirculation
and intake of hot air in all inlet gratings.
3. Distance between unit and wall has to be more than 700 mm or less than 50 mm, not
touching the wall. Any other distance in between is not allowed.
4.3 Electrical connections
General
Important
• The voltage on the terminals must not deviate more than 10% of the nominal voltage.
It is however highly recommended to keep the voltage drop over the supply cables at
nominal current below 5% of the nominal voltage (IEC 60204-1). If cables are grouped
together with other power cables, it may be necessary to use cables of a larger size
than those calculated for the standard operating conditions.
• Use the original cable entry. See section Dimension drawings.
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 unit.
• Local regulations remain applicable if they are stricter than the values proposed
below.
General instruction for the electrical installation of VSD units
• Electrical equipment from Atlas Copco Compressor is designed in accordance with the
safety regulations described in IEC60204-1 and CENELEC EN60204.
• It is the responsibility of the customer to install the unit according to the safety regulations in
order to protect people from electric shocks from direct or indirect contact.
• In drives with frequency converters, 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 instructions for TN, TT, IT
In each network system (TN, TT or IT), the customer has to protect the installation using
overcurrent protection by means of fuses or automatic circuit breaker protection.
With respect to the power distribution system, additional installation instructions are given.
Network type TN (TN-S, TN-C and TN-C-S)
No additional protections need to be installed. If the customer wishes to or needs to install a
leakage detection device, it should be of type B and should comply with IEC755 Amendment 2
"General requirements for residual current-operated protective devices". Atlas Copco advises
customers to install the following earth leakage detection device: BENDER RCMA 470LY with
external current transformer: http://www.bender.org/prod.html
Instruction book
AIF999999 49
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