4-35
4-3 Wiring Conforming to EMC Directives
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Surge Suppressors
 Install surge suppressors for loads that have induction coils, such as relays, solenoids, brakes,
clutches, etc.
 The following table shows the types of surge suppressors and recommended products.
 Thyristors and varistors are made by the following manufacturers. Refer to manufacturer's
documentation for details on these components.
Thyristors: Ishizuka Electronics Co.
Varistor: Ishizuka Electronics Co., Panasonic Corporation
Contactors
 Select contactors based on the circuit's inrush current and the maximum momentary phase
current.
 The drive inrush current is covered in the preceding explanation of no-fuse breaker selection.
And the maximum momentary phase current is approx. twice the rated current.
Type Feature Recommended product
Diodes Diodes are used for relatively small loads
such as relays when the reset time is not a
critical issue.
At power shutoff the surge voltage is the
lowest, but the reset time takes longer.
Used for 24/48-VDC systems.
Use a fast-recovery diode with a short
reverse recovery time.
(e.g. RU2 of Sanken Electric Co., Ltd.).
Thyristors
and varistors
Thyristors and varistors are used for loads
when induction coils are large, as in
electromagnetic brakes, solenoids, etc.,
and when reset time is critical.
The surge voltage at power shutoff is
approx. 1.5 times the varistor voltage.
Select the varistor voltage as follows.
24-VDC systems: varistor voltage 39 V
100-VDC systems: varistor voltage 200 V
100-VAC systems: varistor voltage 270 V
200-VAC systems: varistor voltage 470 V
Capacitor
+ resistor
The capacitor plus resistor combination is
used to absorb vibration in the surge at
power supply shutoff.
The reset time can be shortened by
selecting the appropriate capacitance and
resistance.
Okaya Electric Industries Co., Ltd.
XEB12002 0.2 µF-120 Ω
XEB12003 0.3 µF-120 Ω
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