2-10
2-2 Wiring
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
2
Design
Wiring the Main Circuit Terminals
 Before wiring, make sure that the CHARGE indicator is OFF.
 Once the power supply is turned on, the capacitor in the Inverter is charged with high voltage for
a while even after the power supply is turned off and regardless of whether the Inverter is running
or not.
 If you are going to change cable connections after the power supply is turned off, wait for at least
10 minutes. Before wiring, check for a residual voltage between terminals "P/+2" and "N/−" with
a circuit tester to ensure safety.
Main power supply input terminals (R/L1, S/L2, T/L3)
Use an earth leakage breaker for circuit (wiring) protection between the power supply and the
main power supply terminals (R/L1, S/L2, T/L3).
An earth leakage breaker may malfunction at high frequency. Use an earth leakage breaker
with a large high-frequency sensitive current rating.
As a guide for leakage current, if a CV wire is used and routed through a metal pipe, the
leakage current is 30 mA/km. Due to the higher specific inductive capacity of the H-IV wire, the
leakage current increases about eight times.Use a wire with a sensitivity current one-level
higher. The leakage current mentioned here is the effective value of the fundamental wave,
and high-frequency currents are excluded.
When the Inverter protective function is activated, your system may fail or an accident may
occur. Connect a magnetic contactor to turn off the Inverter power supply.
Do not start or stop the Inverter by switching ON/OFF the magnetic contactor provided in the
Inverter power supply input (primary) circuit and output (secondary) circuit.To start or stop the
Inverter via an external signal, use the operation command terminals (FW, RV) on the control
circuit terminal block.
Do not use this Inverter with an input phase loss connection. Doing so may damage the
Inverter.
The Inverter operates with 1-phase input during input phase loss, causing a trip (due to
undervoltage, overcurrent, etc.) or damage to the Inverter. Even if an input phase is open, the
internal capacitor is charged with voltage, and electric shock or injury may occur.
When changing the cable connections, refer to "Precautions for Use."
Inverter-motor distance Sensitivity current of earth leakage breaker
100 m max.
30 mA
300 m max.
100 mA
800 m max.
200 mA
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