Yaskawa R1000 Series Power Regenerative Unit - Manual (Page 145)

7.5 Installing Peripheral Devices
YASKAWA ELECTRIC TOEP C710656 08B YASKAWA Power Regenerative Unit - R1000 Instruction Manual 145
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■ Application Precautions when Installing a GFCI
Drive outputs generate high-frequency leakage current as a result of high-speed switching. Install a GFCI on the input
side of the drive to switch off potentially harmful leakage current.
Use a GFCI with harmonic countermeasures and with a rated operating current of 30 mA minimum for each connected
drive at the power supply side to eliminate harmonic leakage current and suppress any potentially harmful frequencies.
Leakage current can cause unprotected components to operate incorrectly. If this is a problem, lower the carrier
frequency, replace the components in question with parts protected against harmonic current, or increase the sensitivity
amperage of the circuit interrupter to at least 200 mA per drive.
Factors in determining leakage current:
• Size of the drive
• EMI/RFI filter
• Carrier frequency
• Motor cable type and length
Select an interrupter that senses all types of current (AC and DC) and high frequency currents to safely protect the system.
◆ Installing a Magnetic Contactor at the Power Supply Side
■ Disconnecting the Power Supply
Instead of an MCCB, you can also use an MC in the sequence to turn off the power supply for the main circuits when
protection functions in the drive are activated or for emergency stop operations. However, if an MC at the input (primary
side) to the drive is used to force the drive to stop, it will stop without performing regenerative operation. Create the
sequence carefully.
NOTICE: Do not connect electromagnetic switches or MCs to the output motor circuits without proper sequencing. Improper
sequencing of output motor circuits could result in damage to the drive.
NOTICE: Install an MC on the input side of the drive when the drive should not automatically restart after power loss. To get the full
performance life out of the electrolytic capacitors and circuit relays, refrain from switching the drive power supply off and on more than
once every 30 minutes. Frequent use can damage the drive. Use the drive to stop and start the motor.
NOTICE: Use a magnetic contactor (MC) to ensure that power to the drive can be completely shut off when necessary. The MC should
be wired so that it opens when a fault output terminal is triggered.
Note: Set up a delay that prevents the MC from opening prematurely to continue operating the drive through a momentary power loss.
◆ Connecting a Surge Absorber
A surge absorber suppresses surge voltage generated from switching an inductive load near the drive. Inductive loads
include magnetic contactors, relays, valves, solenoids, and brakes. Always use a surge absorber or diode when operating
with an inductive load.
WARNING! Fire Hazard. Do not connect surge absorbers to the drive output power terminals. Failure to comply may result in serious
injury or death by fire or flying debris.
◆ Attachment for External Heatsink Mounting
An external attachment can be used to project the heatsink outside of an enclosure to ensure that there is sufficient air
circulation around the heatsink.
Contact a Yaskawa sales representative or Yaskawa directly for more information on this attachment.
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