8.4 Installing Peripheral Devices
This section describes the proper steps and precautions to take when installing or connecting various peripheral devices
to the drive.
• Refer to peripheral device manual for detailed installation instructions.
NOTICE: Use a class 2 power supply (UL standard) when connecting to the control terminals. Improper application of peripheral devices
could result in drive performance degradation due to improper power supply.
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Installing a Molded Case Circuit Breaker (MCCB)
Install a MCCB for line protection between the power supply and the main circuit power supply input terminals R/L1, S/
L2 and T/L3. This protects the main circuit and devices wired to the main circuit while also providing overload protection.
Consider the following when selecting and installing an MCCB:
• The capacity of the MCCB should be 1.5 to 2 times the rated output current of the drive. Use an MCCB to keep the drive
from faulting out instead of using overheat protection (150% for one minute at the rated output current).
• If several drives are connected to one MCCB or an MCCB is shared with other equipment, use a sequence that shuts the
power OFF when errors are output by using magnetic contactor (MC) as shown in the following figure.
Drive
Power
Supply
R/L1
MB
MCCB
MC
MC
MC
MC
S/L2
T/L3
SA
Figure 8.2 Connecting a MCCB
WARNING! Electrical Shock Hazard. Disconnect the MCCB and MC before wiring terminals. Failure to comply may result in serious
injury or death.
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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.
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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: Install a 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.
8.4 Installing Peripheral Devices
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SIEP C710606 33A OYMC AC Drive – J1000 User Manual
