Wiring The Main Circuits - YASKAWA Varispeed G7 Series Instruction Manual

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Wiring the Main Circuits

This section describes wiring connections for the main circuit inputs and outputs.
Wiring Main Circuit Inputs
Observe the following precautions for wiring the main circuit power supply inputs.
Installing a Ground Fault Interrupter
Always connect the power input terminals (R, S, and T) and power supply through a ground fault interrupter
(ELCB) that is suitable for the Inverter.
Choose an ELCB with a capacity of 1.5 to 2 times the Inverter's rated current.
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For the ELCB's time characteristics, be sure to consider the Inverter's overload protection (one minute at
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150% of the rated output current).
If the same ELCB is to be used for more than one Inverter, or other devices, set up a sequence so that the
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power supply will be turned OFF by a fault output, as shown in Fig 2.6.
20P4 to 2030: 3-phase,
200 to 240 VAC, 50/60 Hz
2037 to 2110: 3-phase,
200 to 230 VAC, 50/60 Hz
40P4 to 4300: 3-phase,
380 to 460 VAC, 50/60 Hz
We recommend using a magnetic contactor (MC) to ensure that the power to the Inverter can be completely
shut off when necessary.
The MC should be wired so that it opens when a fault output terminal is triggered.
Inverter outputs use high-speed switching, so high-frequency leakage current is generated. At the Inverter pri-
mary side, use a ground fault interrupter for Inverters with a countermeasure against high frequency to detect
only the leakage current in the frequency range that is hazardous to humans and to ignore high-frequency leak-
age current. Use one or several ground fault interrupters with a total cumulative sensitivity amperage of at
least 30 mA per Inverter.
Using a ground fault interrupter without a countermeasure against high frequency may result in a malfunction
caused by high-frequency leakage current. If a ground fault interrupter without a countermeasure malfunc-
tions, replace it with a ground fault interrupter with a countermeasure against high frequency or reduce the
carrier frequency of the Inverter. Alternatively, use one or several ground fault interrupters with a total cumu-
lative sensitivity amperage of at least 200 mA per Inverter.
Power
ELCB
supply
* For 400 V Class Inverters, connect a 400/200 V transformer.
Fig 2.6 ELCB Installation
Wiring Main Circuit Terminals
Inverter
R/L1
S/L2
T/L3
Fault output
(NC)
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2-