WARNING! Electrical Shock Hazard. Disconnect the MCCB (or ELCB) and MC before wiring terminals.
Failure to comply may result in serious injury or death.
u
Installing a Leakage Breaker
Drive outputs generate high-frequency leakage current as a result of high-speed switching.
Install an Earth Leakage Circuit Breaker (ELCB) on the input side of the drive to switch off
potentially harmful leakage current. Because each drive generates about 100 mA of leakage
current across a 1 m cable and
another 5 mA for each additional meter, each drive should have
a leakage breaker with a sensitivity amperage of at least 30 mA per drive to eliminate harmonic
leakage current and suppress any potentially harmful frequencies.
Refer to the Yaskawa catalog for ELCB selection. 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 leakage breaker to at least 200 mA per drive.
Factors in determining leakage current:
• Size of the AC drive
• AC drive carrier frequency
• Motor cable type and length
• EMI/RFI filter
To safely protect the drive system, select a breaker that senses AC and DC currents and high
frequency currents.
u
Installing a Magnetic Contactor
n
Disconnecting the Power Supply
The drive should be shut off in the case of a fault in external equipment such as braking
resistors through use of a Magnetic Contactor (MC).
NOTICE: Do not connect electromagnetic switches or MCs to the output motor circuits without proper
sequencing. Improper sequencing of output motor circuits may cause 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 MC more than once every 30 minutes. Frequent use can damage the drive. Use the drive to
stop and start the motor.
Note: 1. Install an MC to the drive
output to prevent the drive from restarting automatically when the power
is restored after momentary power loss.
2. Set up a delay for the MC so that it does not open prematurely for the drive to continue operating
through momentary power loss.
7.4 Installing Peripheral Devices
192
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
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