14.1 Surge Absorbers (Varistors) and Diodes for Holding Brake Power Supplies
14-2
14.1
Surge Absorbers (Varistors) and Diodes for Holding Brake Power Supplies
Surge Absorbers (varistors) and Diodes for holding brake power supplies help prevent damage
to brake coils caused by voltage surges.
If you use a Servomotor with a Holding Brake and switch the brake power supply circuit on the
DC side, connect a Surge Absorber (varistor) or Diode that is suitable for the brake power sup-
ply voltage and current.
Surge Absorbers (Varistors) for Holding Brake Power
Supplies
Use the following table as reference in selecting a Surge Absorber. Elements were selected for
a Surge Absorber surrounding air temperature range of -20°C to 60°C and an ON/OFF switch-
ing frequency of 10 times or less per minute. The information in this table is for reference only,
and does not ensure operation in combination with the holding brake.
Diodes for Holding Brake Power Supplies
Select a Diode for the holding brake power supply with a rated current that is greater than that
of the holding brake and with the recommended withstand voltage given in the following table.
Diodes are not provided by Yaskawa.
• When you select a Surge Absorber, varistor, or Diode for your application, consider the service
life and test all operations, including the brake timing, before you use the Servomotor.
• If you connect an SSR (i.e., a semiconductor relay) to switch the brake circuit, use a Diode.
• If you connect a Diode, more time is required to brake than with a Surge Absorber. (Refer to the
following figure.) If you use a diode, consider this in the application.
Holding Brake Power Supply Voltage 24 VDC
Manufacturer
Nippon Chemi-Con
Corporation
Semitec Corporation
Order Number
Brake Rated Current
1 A max. TNR5V121K Z5D121
2 A max. TNR7V121K Z7D121
4 A max. TNR10V121K Z10D121
8 A max. TNR14V121K Z15D121
Holding Brake Power Supply Unit Specifications
Withstand Voltage
Rated Output Voltage Input Voltage
24 VDC 200 V 100 V to 200 V
0
0
Time
Surge Absorber
Holding the
brake (varistor)
Diode
Surge Absorber
Time
Voltage
Holding the
brake (Diode)
Diode
Current
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