Chapter 3 Environment description and installation
3-12
z The power supply and output PE terminals must be both connected to ground to increase noise
immunity of the built-in Filter.
(A)The control circuit wiring and main circuit wire/ other high voltage/current
power wiring should be separated to avoid noise interruption.
z In order to prevent noise interference which could cause inverter faults, the control circuit signal
should be shielded and twisted. Please refer to figure 3-12. The wiring distance should be less
than 150ft (50m).
(B)Connect ground terminals as follows:
(200V class ground <100Ω ; 400V class ground
<10Ω .)
z Ground wiring AWG is sized per the electrical equipment specifications and should be made as
short as possible.
z Do not share the ground of the inverter with other high current loads (welding machine, high power
motor).Connect the terminal to its own ground.
z Do not make a loop when several inverters share a common ground point.
(a) Good (b) Good (c) Bad
(C)To ensure maximum safety, use correct wire size for the main power circuit and control circuit.
(See table in section 3.2.2)
(D)Verify that all wiring is correct, wires are intact, and terminal screws are secured.
Do not connect this end
Shield sheath
Armor
Wrapped with
insulating tape
To ground terminal
Ground
Figure 3-11 Grounding filtered units
Figure 3-12 Processing the ends of twisted pair cables
Figure 3-13 Grounding examples: multiple drives
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