Danfoss Turbocor Twin-Turbine TTS Series, Руководство по применению и установке

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M-AP-001-EN Rev. Q
Figure 6-1 Typical Ground Connections
6.12 Equipment Panel
Normally, the line reactor, EMI/EMC filter(s), and the harmonic filter will be installed in a panel. This
could be the same panel where the controls are located. When designing a panel, attention should be
given to the following recommendations:
• All metal parts should be properly connected to ensure an electrical connection. Connect panel
doors with braided cable.
• Separate the panel into sections for power and interface/control functions (all electrical
components and practices should follow all applicable local saftey regulations and standards).
• Keep power cables and interface cables separate. Use metal cable glands for shielded cables.
• The wire-loom going to the panel door should be shielded using a metal-braided hose that is
connected to ground at both ends.
• Electrical panel must have a dedicated ground conductor in accordance with relevant electrical
safety regulations.
• Verify that the panel ground conductor is sized in accordance with relevant electrical safety
regulations.
NOTE
• The installing electrical contractor is responsible for connecting the panel ground to the facility ground in accordance with
relevant electrical codes and standards, such as NEC Section 250 in the U.S. or its equivalent for other countries.
• Special filtering and measuring may be required in installations such as hospitals that are prone to being influenced by other
electronic equipment.
6.13 Mains Input Cable Specification
The aim of electrical cables is to be a carrier (conductor) for electrical power. The influence of the
power source on the environment, or the influence of the environment on the power source, should
be such that neither the proper functioning of the compressor nor equipment in its environment is
adversely affected. Therefore, Danfoss LLC advises to use some type of shielded cable for the mains
input.
When using shielded cable, select a cable with an effective shield. A cable with an aluminum foil will
be far less effective than a specially designed conductive braid. It is best to connect both ends of
the cable shield to ground since the shield is not part of the signal path. Alternatively, non-shielded
conductors may be used if they are carried inside of a code approved electrical metallic conduit of the
flexible or rigid types.
Shielding
I/O Cables
Shielding
(power cables)
Analog 0V
Inputs
Analog Ground*
to motors, etc
Safety Ground (PE)
24V/5V
Circuits
Digital Ground*
Panel
Doors
Back
Plate
110V/230V
Circuits
Reference Ground
* = Isolated from panel.