Yaskawa SGDB User Manual
Page 157
3.8 Special Wiring
145
The following is an example of wiring for noise control.
Noise filter
*
Servomotor
SGDB
SERVOPACK
(Casing)
• Operation relay se-
quence
• Signal generation cir-
cuit (provided by cus-
tomer)
3.5 mm
2
or more
Wire with a thickness of
3.5 mm
2
or more
Ground plate
Ground: One-line grounding
(at least class 3 grounding)
(Casing)
(Casing)
(Casing)
(Casing)
3.5 mm
2
or more
3.5 mm
2
or more
2 mm
2
or more
ground
200VAC
3.5 mm
2
or more
(Note b)
FG
* 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
2
(preferably, plain stitch cooper wire).
b) For wires indicated by P↕, use twisted-pair cables whenever possible.
J
Correct Grounding
• Always ground the motor frame.
Always connect servomotor frame terminal FG to the SERVOPACK ground terminal
.
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
required to prevent the adverse effects of switching noise.
• If the reference input line receives noise, do the following.
Ground the 0 V line (SG) of the reference input line. If the main circuit wiring for the motor
is accommodated in a metal conduit, ground the conduit and its junction box. For all
grounding, always use one-line grounding.
3