Yaskawa Sigma II Series SGMVH - Manual (Page 144)

6.4 Others
6
Wiring
6-19
* 1. For ground wires connected to the casing, use a thick wire with a thickness of
at least 3.5 mm (preferably, plain stitch copper wire).
* 2. : represents twisted-pair wires.
(2) Correct Grounding
(a) Grounding the Motor Frame
Always connect servomotor frame terminal FG to the SERVOPACK ground terminal . Also 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 servomotor stray capacitance. The above grounding is required to prevent the adverse
effects of switching noise.
(b) Noise on the Reference Input Line
If the reference input line receives noise, ground the 0 V line (SG) of the reference input line. If the main cir-
cuit wiring for the motor is accommodated in a metal conduit, ground the conduit and its junction box.
For all grounding, ground at one point only.
M
(FG)
U
W
V L2/S
L1/R
L3/T
CN2
1LF
∗2
2LF
PG
0 V
+
-
24 VDC
DC24P
DC24N
380 to 480 V
SGDH
SERVOPACK
Servomotor
Operation relay
sequence
Signal generation
circuit (provided by
customer)
(Casing)
(Casing)
(Casing) (Casing)
(Casing)
(Ground plate)
3.5 mm
min.
2
380 to 480
VAC
Noise filter
∗1
∗1
2 mm
2
min.
3.5 mm min.
∗1
2.0 mm
min.
3.5 mm
min. 2
Wires of 3.5 mm
or more
Ground: Ground to an independent ground
(at least class-3 grounding (100
Ω max).)
AVR
(Ground)