7.0
INSTALLATION
IRN37–160K–OF & IRN50–200H–OF
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21
7.3 ELECTRICAL
CAUTION
This procedure should only be carried out by a qualified electrician, electrical contractor or your local
Ingersoll–Rand Distributor or Air Center.
The compressor and drive should be properly grounded
/ earthed in accordance with Local and National Code
requirements.
Installation of this compressor must be in accordance
with recognized electrical codes and any local Health
and Safety Codes.
The compressor must have its own isolator situated
adjacent to it. The fuse protecting the circuit and the
compressor must be selected in accordance with local
and national code requirements on the basis of the data
provided in the general information section
Feeder cables should be sized by the
customer/electrical contractor to ensure that the circuit
is balanced and not overloaded by other electrical
equipment. The length of wiring from a suitable
electrical feed point is critical as voltage drops may
impair the performance of the compressor.
Cable sizes may vary considerably so the mains
terminals will accept up to 50mm
2
(1 AWG)
(37/45k & 50/60H) and up to 90mm
2
(3/0 AWG)
(55/75k & 75/100H) cable. The N75K–160K and
N100H–200H machines mains terminals will
accept 2 x 120mm2 (4/0 AWG) cables.
Feeder cable connections to incoming terminals
L1–L2–L3 should be tight and clean.
The applied voltage must be compatible with the motor
and compressor data plate ratings.
The control circuit transformer has different voltage
tappings. Ensure that these are set for the specific
applied voltage prior to starting.
A hole is provided for incoming power connection. If it
is necessary to make a hole in the control box in a
different location, care should be taken to not allow
metal shavings to enter the starter and other electrical
components within the box. If another hole is used, the
original hole must be blocked off.
The feeder cable must be suitably glanded into the
power drive module (P.D.M.) electrical box to ensure
that dirty air does not by–pass the filter pads or degrade
the cooling air flow.
On completion of electrical installation, check that
both the main blower motor and heat sink blower
motor rotations are correct.
This machine is designed for use in heavy industrial
environments, where the electricity supply is separated
from nearby residential and commercial areas. If the
machine is to be used in the light industrial, residential
or commercial environment where the local supply
network is shared, further radio frequency (RF)
screening measures may be required. Consult your
local distributor/supplier for details of the optional RF
filter.
The compressor has a anti–condensation heater and
thermostat in the electrical box. This circuit can be
connected to an independent electrical supply of either
110V or 230V single phase, dependant on the country
of installation. The supply should be suitable fused and
an independent isolator installed adjacent to the
compressor.
This should be done in accordance with local and
national codes. It is good practice and sometimes
mandatory, to display suitable signs warning that the
machine has two separate electrical supplies which
both
must be isolated before any work is attempted.
Alternately it can be supplied from the 110V tapping of
the control transformer and connected as shown on
schematic wiring diagram.
