Yaskawa Z1000U - Manual (Page 238)

6.5 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 when connecting to the control terminals. Improper application of peripheral devices could result in
drive 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 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 GFCI:
• The capacity of the MCCB or GFCI should be 1.5 to 2 times the rated output current of the drive. Use an MCCB or GFCI
to keep the drive from faulting out instead of using overheat protection (110% for one minute at the rated output current).
• If several drives are connected to one MCCB or GFCI 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 Figure 6.9 .
R/L1
MB
MCCB or GFCI A
B
MC
MC
MC
MC
S/L2
T/L3
C SA
A – Power supply
B – Drive C – Control power supply
Figure 6.9 Power Supply Interrupt Wiring (Example)
WARNING! Electrical Shock Hazard. Disconnect the MCCB (or GFCI) and MC before wiring terminals. Failure to comply may result in
serious injury or death.
n 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 and built-in EMC filter 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.
6.5 Installing Peripheral Devices
238 YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual