105 of 114M-AP-001-EN Rev. Q
20.6.3 Voltage-Free Contacts
Prior to connecting the interlock terminals of the compressor I/O board, measure the resistance
across the customer’s interlock terminals (refer to "Figure 20-8 Interlock Circuit Tests"). Ensure that the
interlock contacts are closed. The measured value should be less than 1Ω.
Figure 20-8 Interlock Circuit Tests
Measure the voltage between each customer interlock terminal and the frame ground while the
interlock contacts are open and closed. In either contact state, if the measured voltage is not zero
(0), verify the source of the voltage. Do not connect the interlock terminals until the voltage source is
removed (refer to "Figure 20-9 Typical Electrical Connections" on page 106).
20.7 Power Wiring
This section describes the connection of the power wiring to the compressor.
"Figure 20-9 Typical Electrical Connections" on page 106 shows a typical schematic for the
compressor’s electrical connections.
I/Lock
I/Lock
Interlock Circuit
Interlock Circuit
NOTE
The AC input cable should be CSA, UL, or CE approved, 3-wire with a common shield and single ground. It is recommended that
the cable be double-jacketed; for example, a teck cable type. The cable must be rated for 90° C (194° F) minimum with a
maximum current rating corresponding to the LRA value on the compressor nameplate.
Keep power cables and control interface cables in separate conduits. Use metal cable glands for shielded cables to ensure good
grounding.
If you are installing a Danfoss LLC line reactor or EMI or harmonic filter in the mains input circuit, refer to the applicable
installation instructions.
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