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8.5 Installing Peripheral Devices
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
449
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8.5 Installing Peripheral Devices
This section describes the proper steps and precautions to take when installing or connecting various peripheral devices
to the drive.
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.
◆
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 capacity of the MCCB or ELCB should be 1.5 to 2 times the rated output current of the drive. Use an MCCB or
ELCB 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 ELCB that is shared with other equipment, use a sequence that shuts
the power OFF when errors are output by using a magnetic contactor (MC) as shown in the following figure.
Figure 8.17
Figure 8.19 Power Supply Interrupt Wiring (Example)
WARNING!
Electrical Shock Hazard. Disconnect the MCCB (or ELCB) and MC before wiring terminals. Failure to comply may result in
serious injury or death.
■
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.
Each drive should have a leakage breaker with a sensitivity amperage of at least 30 mA per drive. This will 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 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
In order to safely protect the drive system, select a breaker that senses all types of current (AC and DC) and high
frequency currents.
A – Power supply
C – Control Power Supply
B – Drive
R/L1
MB
MCCB or ELCB
A
B
MC
MC
MC
MC
S/L2
T/L3
C
SA
SIEP_C710636_02B_1_0.book 449 ページ 2015年11月25日 水曜日 午後4時56分