MC
SA
AC380~480V
50/60 Hz
400 / 200 V
MCCB MC
MC
Three-Phase
Transformer
R/L1
MB
MC
S/L2
T/L3
Drive
Figure 7.3 Connecting a MCCB (Three-Phase 400 V Class)
WARNING! Electrical Shock Hazard. Disconnect the MCCB 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 a Ground Fault Circuit Interrupter (GFCI) on the input side of the drive to switch off
potentially harmful leakage current.
Factors in determining leakage current:
• Size of the AC drive
• AC drive carrier frequency
• Motor cable type and length
• EMI/RFI filter
In order to safely protect the drive system, select a breaker that senses all types of current (AC
and DC) and high frequency currents.
Note: Choose a GFCI designed specifically for an AC drive. The operation time should be at least 0.1 second with
sensitivity amperage of at least 200 mA per drive. The output waveform of the drive may cause the leakage
current to increase. This may, in turn, cause the leakage breaker to malfunction. Take the following steps
to correct the problem:
• Increase the sensitivity amperage.
• Lower the carrier frequency.
u
Installing a Magnetic Contactor
n
Disconnecting the Power Supply
The drive can be shut off in the case of a fault in external equipment such as braking resistors
through use of a Magnetic Contactor (MC).
7.4 Installing Peripheral Devices
172
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
2/6/2008-14:44
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