Omron OMNUC W Series User Manual page 206

System Design and Installation
D Surge Killers
Install surge killers for loads that have induction coils, such as relays, solenoids, brakes, clutches, etc.
The following table shows types of surge killers and recommended products.
Type
Diode Diodes are relatively small devices such as relays used
for loads when reset time is not an issue. The reset time
is increased because the surge voltage is the lowest
when power is cut off. Used for 24/48-V DC systems.
Thyristor Thyristor and varistor are used for loads when induction
or coils are large, as in electromagnetic brakes, solenoids,
Varistor etc., and when reset time is an issue. The surge voltage
when power is cut off is approximately 1.5 times that of
the varistor.
Capacitor Use capacitors and resistors for vibration absorption of
+ resistor surge when power is cut off. The reset time can be
shortened by proper selection of the capacitor or resis-
tor.
Note Thyristors and varistors are made by the following companies. Refer to manufacturers' documentation for
operating details.
D Contactors
When selecting contactors, take into consideration the circuit's inrush current and the maximum
momentary current. The Servo Driver inrush current is covered in the preceding explanation of no-fuse-
breaker selection, and the maximum momentary current is approximately twice the rated current. The
following table shows the recommended contactors.
Magnetic Contactors for the W-series
Coil Voltage
110 V AC 20 A
230 V AC 20 A
35 A
50 A
90 A
24 V DC 20 A
35 A
50 A
90 A
Additional Auxillary Contacts for Top Mounting on the Magnetic Contactor
J73K-BM-11 2-pole
J73K-BM-22 4-pole p
J73K-BM-31
3-40
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Features
Thyristors: Ishizuka Electronics Co.
Varistors: Ishizuka Electronics Co., Matsushita Electric Industrial Co.
Rated current Order number
J7K-BM 110 V 50 Hz
J7K-BM 230 V 50 Hz
J7K-CM 230 V 50 Hz
J7K-DM 230 V 50 Hz
J7K-EM 230 V 50 Hz
J7K-BM-D 24 V DC
J7K-CM-D 24 V DC
J7K-DM-D 24 V DC
J7K-EM-D 24 V DC
1M 1B
2M 2B
3M 1B
Recommended products
Use a fast-recovery diode with a
short reverse recovery time.
Fuji Electric Co., ERB44-06 or equiv-
alent
Select varistor voltage as follows:
24-V DC system:
100-V DC system:
100-V AC system:
200-V AC system:
Okaya Electric Industries Co., Ltd.
CR-50500
CRE-50500 0.5 µF-50 Ω
S2-A-0
Maker
OMRON
OMRON M = Make contact
B = Break contact
Chapter 3
39 V
200 V
270 V
470 V
0.5 µF-50 Ω
0.2 µF-500 Ω