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SECTION 1 PLANNING & INSTALLATION
The unit must be properly grounded. There must be at least one grounding
strap from the compressor skid or baseplate. The connection must be made to an
independent ground and not to a plant system ground. Inadequate grounding, or lack
of grounding, may result in operational problems. Additional grounding may be
required for the compressor driver. Further information may be obtained from the
National Electric Code or other electrical information sources.
Design and installation of disconnect, overvoltage, short circuit, and overload
protection is the responsibility of the customer.
Control Panel Power
The standard Centac compressor control circuitry is designed for a 120 VAC source. If the
customers source is greater than 120 VAC, a control transformer must be used. Check the
Electrical Schematic to determine whether the control transformer has been factory
installed.
To properly make electrical connections to the control panel, refer to the Electrical
Schematic to identify the proper terminals for wire connection, and refer to the panel outline
drawing for conduit entry size. Incoming power should be connected to the appropriate
terminal blocks in the control panel as shown by the Electrical Schematic.
Starter Interface
Remote starters require two interface points:
1. A feedback circuit, which indicates a running condition, is connected to the control
circuits inside of the compressor's control panel. This is done by the customer.
2. The starter's on/off circuit is connected with the panel's start control relay. Local start
pushbuttons on the starter should not be used. The starter's 120 VAC control circuit
should be connected to the control panel start circuit. Do not exceed 720 VAC. The
circuit must be wired in series with the starter. The starter must not be powered by any
other source other that Ingersoll-Rand's control panel.
Motor Connections
Three-phase power must be connected to the starter and the three-phase wiring must also
be connected from the starter to the main motor. The motor will be furnished with leads
terminating in a junction box on the side of the motor to which the three-phase wiring from
the starter is to be terminated. Refer to the main motor nameplate and manufacturer's data
sheet to properly size the three-phase wiring that connects the starter to the motor. The
customer should ensure that the incoming voltage matches the voltage on the main motors
CAUTION
NOTE
Centac Instruction Manual
2000 Ingersoll-Rand Company
Date of Issue: December, 2003
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