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M-AP-001-EN Rev. Q
4.1 Control Wiring Connection Guidelines
To ensure proper control wiring techniques, follow these guidelines:
1. The ground reference of the external circuit connected to the Compressor I/O Board must be at
the same potential as the ground reference on the Compressor I/O Board.
2. The Interlock circuit should be voltage-free. For instance, all external contractors/switches
must not introduce current into the circuit.
3. Analog outputs (such as Motor Speed) must be received by the external circuit without
sending current back to the Compressor I/O Board.
4. All interlock and analog output cables should be shielded with one end of the shield
connected to the common analog or digital ground bus. The other end of the shield must
not be grounded as this would create a ground loop. Refer to "Figure 4-2 Modbus Grounding
Diagram" on page 30.
4.2 Interface Cable
The cable that carries the I/O communication to the compressor is 5 meters (16.4 feet) in length and
is equipped with high-density 44-pin connectors (female at one end and male at the other end).
An extension cable is available from your local supplier. An optional 10 meter (32.8 ft) cable is also
available in the Spare Parts Selection Guide.
NOTE
If an I/O extension cable is used, heat-shrink tubing should be applied to the mating cable connectors to maintain good
conductivity and protect the connection from heat and humidity.
For RS-485 communication, the maximum cable length should not exceed 100 meters (328 feet). If
using RS-232 communication, the cable length should not exceed 15 meters (50 feet) between the PC
and the compressor (refer to "Figure 4-3 I/O Wiring Specifications").
Figure 4-3 I/O Wiring Specifications
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