APPLICATIONS
2.8.2 Wiring for Noise Controlcont.
— 2-70 —
Correct Grounding
•
Always ground the motor frame.
Always connect the Servomotor frame terminal 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.
•
Ground the 0 V line (such as 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 ground.
Noise Filter Installation
Use an inhibit type noise filter to prevent noise from
the power supply line.
Install a noise filter on the power supply line for
peripheral equipment as necessary.
The following table lists recommended noise filters for each Servopack type.
Table 2.1 Noise Filters
Servopack Type Noise Filter
Connection
Recommended Noise Filter
(See Note.)
Type Specifications
10 W
SGDF-A1Cj
(Correct)
LF-205A Single-phase
20 W
SGDF-A2Cj
200 VAC, 5 A
30 W
SGDF-A3Cj
3W
SGDF-B3Cj
(Incorrect)
LF-205A Single-phase
5W
SGDF-B5Cj
200 VAC, 5 A
10 W
SGDF-B9Cj
Note
These noise filters are manufactured by Tokin Corp. and are available from Yas-
kawa. For noise filters, contact your nearest Yaskawa sales representatives.
Always observe the following installation and wiring precautions. Incorrect use of a noise filter
significantly diminishes its benefits.
2
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