Correct Grounding; Special Wiring - YASKAWA SGM series User Manual

c) The following is an example of wiring for noise control.
*
Noise filter
100 or
200 VAC
(Casing)
* When using a noise filter, always observe the following wiring instructions:
Note a) For a ground wire to be connected to the casing, use a thick wire with a thick-
ness of at least 3.5 mm
b) For wires indicated by P↕, use twisted-pair cables whenever possible.

2) Correct Grounding

• Always ground the motor frame.
Always connect servomotor frame terminal FG (green) to the Servopack ground termi-
nal. Be sure to ground the ground terminal.
• If the servomotor is grounded via the machine, a switching noise current will flow from
the Servopack power unit through motor stray capacitance. The above grounding is re-
quired to prevent the adverse effects of switching noise.
• If the reference input line receives noise, do the following.
Ground the 0 V line (such as SG-V and SG-T) of the reference input line. If the main circuit
wiring for the motor is accommodated in a metal conduit, ground the conduit and its junc-
tion box. For all grounding, always use one-line grounding.
• Operation relay se-
quence
• Signal generation cir-
cuit (provided by cus-
tomer)
(Casing)
(Casing)
(Casing)
Wire with a thickness of
2
3.5 mm or more
(Casing)
2
(preferably, plain stitch cooper wire).

3.8 Special Wiring

(White)
SGDA
Servopack
(Blue)
2
3.5 mm
or more
2
3.5 mm
or more
Ground plate
Ground: One-line grounding
(at least class 3 grounding)
Servomotor
(Red)
(Green)
3
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