6.5 Installing Peripheral DevicesThis section describes the proper steps and precautions to take when installing or connecting various peripheral devices to thedrive.NOTICE: Use a class 2 power supply when connecting to the control terminals. Improper application of peripheral devices could result indrive performance degradation due to improper power supply. Refer to NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control,Signaling, and Power Limited Circuits for requirements concerning class 2 power supplies.u Installing a Molded Case Circuit Breaker (MCCB) or Ground Fault Circuit Interrupter(GFCI)Install an MCCB or GFCI for line protection between the power supply and the main circuit power supply input terminalsR/L1, S/L2, and T/L3. This protects the main circuit and devices wired to the main circuit while also providing overloadprotection.Consider the following when selecting and installing an MCCB or GFCI:• Use an MCCB or GFCI to keep the drive from faulting out instead of using overheat protection (110% for one minute at therated output current).• If several drives are connected to one MCCB or GFCI that is shared with other equipment, use a sequence that shuts thepower OFF when errors are output by using magnetic contactor (MC) as shown in Figure 6.8.R/L1MBMCCB or GFCIABMCMCMCMCS/L2T/L3C SAA – Power supplyB – DriveC – Control power supplyFigure 6.8 Power Supply Interrupt Wiring (Example)WARNING! Electrical Shock Hazard. Disconnect the MCCB (or GFCI) and MC before wiring terminals. Failure to comply may result inserious injury or death.n Application Precautions when Installing a GFCIDrive outputs generate high-frequency leakage current as a result of high-speed switching. Install a GFCI on the input side ofthe 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 filterIf 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 200mA per drive. The output waveform of the drive and built-in EMC filter may cause an increase in leakage current. This may in turn causethe leakage breaker to malfunction. Increase the sensitivity amperage or lower the carrier frequency to correct the problem.6.5 Installing Peripheral Devices254 YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
