Omron R88D-GT series User Manual

4-39
4-3 Wiring Conforming to EMC Directives
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 companies. Refer to manufacturers'
documentation for details on these components.
Thyristors: Ishizuka Electronics Co.
Varistors: Ishizuka Electronics Co., Matsushita Electric Industrial Co.
 Contactors
• Select contactors based on the circuit's inrush current and the maximum momentary phase
current.
• The Servo Drive inrush current is covered in the preceding explanation of no-fuse breaker
selection, and the maximum momentary phase current is approximately twice the rated current.
• The following table shows the recommended contactors.
Type Features Recommended products
Diode
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 re-
verse recovery time (e.g. RU2 of Sanken
Electric Co., Ltd.).
Thyristor or
varistor
Thyristors and varistors are used for loads
when induction coils are large, as in elec-
tromagnetic brakes, solenoids, etc., and
when reset time is an issue. The surge
voltage at power shutoff is approximately
1.5 times the varistor voltage.
Select the varistor voltage as follows:
24 VDC system: 39 V
100 VDC system: Varistor V. 200 V
100 VAC system: Varistor V. 270 V
200 VAC system: Varistor V. 470 V
Capacitor
+ resistor
The capacitor plus resistor combination is
used to absorb vibration in the surge at
power shutoff. The reset time can be
shortened by selecting the appropriate ca-
pacitance and resistance.
Okaya Electric Industries Co., Ltd.
XEB12002 0.2 μF - 120 Ω
XEB12003 0.3 μF - 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

Omron R88D-GT series Specifications

General

Brand	Omron
Model	R88D-GT series
Category	Controller
Language	English