Chapter 3 Environment description and installation
3-12
z
The power supply and output PE terminals must be connected to ground to increase noise
immunity of the built-in Filter.
Connect the power cable including Earth as shown
Panel grounding
Connect a metal cable clamp
(or the screen of the cable)
to the motor ground terminal.
The motor cable length should be shorter than 5m.
A Shielded (Screened) or
steel wire amoured cable
must be used. Strip the
cable cover and use a
metal (Copper) clamp to
bond to the panel back
plate.
Panel
Motor
L1 L3 PE
Frame 1
U V W PE
Connect the power cable including Earth as shown
A Shielded (Screened) or steel
wire amoured cable must be
strip the cable cover and use
a metal (Copper) clamp to
bond to the panel back plate.
Frame 2
：
202~203-H1F & 401~403-H3F
Panel grounding
Panel
Motor
L1 (L2) L3 PE
Frame 2
U V W PE
(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 <100
Ω
; 400V class ground
<10
Ω
.)
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
Figure 3-12 Processing the ends of twisted pair cables
Figure 3-13 Grounding examples: multiple drives
Armor
Shield sheath
To ground terminal
Do not connect this end
Wrapped with
insulating tape
