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4-31
4-3 Wiring Conforming to EMC Directives
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
4
System Design
Surge Suppressor
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
Contactor
Select contactors based on the circuit's inrush current and the maximum momentary phase
current.
The driver 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.
The following table shows the recommended contactors.
Type
Feature
Recommended product
Diodes
Diodes are used for relatively small loads
when the reset time is not an issue, such
as relays.
At power shutoff the surge voltage is the
lowest, but the rest 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 an issue.
The surge voltage at power shutoff is
approx. 1.5 times the varistor voltage.
Select the varistor voltage as follows.
For 24-VDC systems, varistor voltage 39
V For 100-VDC systems, varistor voltage
200 V For 100-VAC systems, varistor
voltage 270 V For 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
μ
F-120
Ω
XEB12003 0.3
μ
F-120
Ω
Manufacturer
Model
Rated current
Coil voltage
OMRON
J7L-09-22200
11 A
200 VAC
J7L-12-22200
13 A
200 VAC
J7L-18-22200
18 A
200 VAC
J7L-32-22200
26 A
200 VAC
J7L-40-22200
35 A
200 VAC
J7L-50-22200
50 A
200 VAC
J7L-65-22200
65 A
200 VAC
J7L-75-22200
75 A
200 VAC