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.
u
Installing a Molded Case Circuit Breaker (MCCB) and Earth Leakage Circuit Breaker
(ELCB)
Install an MCCB or ELCB 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 or ELCB:
• The rated current of the MCCB or ELCB should be 1.5 to 2 times the rated output current of the drive. Use an MCCB or
ELCB with operation characteristics that do not trip the MCCB or ELCB faster than the drive overload protection (shuts off
the drive after 1 minute of operation at 150% of the drive rated current).
• If several drives are connected to one MCCB or an ELCB that 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 an MCCB
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
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.
Factors in determining leakage current:
• Size of the AC drive
• AC drive carrier frequency
• Motor cable type and length
• EMI/RFI filter
If the GFCI trips spuriously, consider changing these items or use a GFCI with a higher trip level.
Note: Choose a GFCI designed specifically for an AC drive. The operation time should be at least 0.1 s with sensitivity amperage of at least 200
mA per drive. The output waveform of the drive may cause an increase in leakage current. This may in turn cause the leakage breaker to
malfunction. Increase the sensitivity amperage or lower the carrier frequency to correct the problem.
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).
8.4 Installing Peripheral Devices
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
167
8
Peripheral Devices &
Options
http://nicontrols.com
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