16 C6.2.38/0719/E
4 Electrical connection
4.1 General recommendations
Before connecting the drive to the power network, make sure that all the cables to and from the drive
and to the compressor are correctly connected and that the supply voltage, phases and frequency
match the drive nameplate data.
Wiring should remain physically separated to minimize the introduction of electrical noise.
Before connecting the compressor, ensure the supply voltage, the phases and the frequency match
the nameplate data.
For safety reasons, Emerson recommends that the electrical installation be executed in compliance
with standard EN 60204-1 and/or other standards and regulations of application when dealing with
A3 flammable refrigerants.
When installing YBVH* compressors in a system, the following measures must be taken:
▪ The ground wiring must conform to local regulations and codes of practice (only the provided
parts must be used).
▪ The grounding screw must be torqued to 2.4 to 2.6 Nm.
▪ Add a cable strain-relief device.
▪ Protect cable and wires against sharp edges.
4.2 Electrical installation
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard! The
electrical connection could be a source of ignition. System capacitors may
remain charged for several minutes after shutdown. Before starting to work on
the electrical installation make sure accidental sparking is not possible.
Continuously check if the ambient atmosphere is non-flammable when
working on the electrical installation.
For recommended wiring diagrams, see Figures 17 & 18 in Chapter 4.3 "Wiring diagrams".
NOTE: A K2 contactor, used usually for the safety chain, is optional.
NOTE: An RCD Type B is needed. It can also protect against a DC current leakage.
NOTE: For recommendations about the EMC and details about wiring up the drive assembly,
please refer to the Emerson User Manual for ED3.
Figure 13: Residual current device
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