4 System Design
4 - 42
G5-series Linear Motors/Servo Drives With Built-in EtherCAT Communications
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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.
Additional Information
Thyristors and varistors are made by the following manufacturers.
Refer to manufacturer’s documentation for details on these components.
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Thyristors: SEMITEC Corporation
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Varistors: SEMITEC Corporation, Panasonic Corporation
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Select contactors based on the circuit’s inrush current and the maximum momentary phase current.
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The 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.
Surge Suppressors
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
approximately 1.5 times the varistor voltage.
Select the varistor voltage as follows.
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24-VDC systems: varistor voltage 39 V
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100-VDC systems: varistor voltage 200 V
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100-VAC systems: varistor voltage 270 V
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200-VAC systems: varistor voltage 470 V
Cap
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.
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XEB12002 0.2 µF-120
Ω
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XEB12003 0.3 µF-120
Ω
Contactors