2-2 Wiring „ Main Circuit Connection Diagram Molded case circuit-breaker (MCCB) MC AC reactor noise filter Fuse Regenerative braking unit R/L1 P/+2 N/- U/T1 V/T2 M 2 Power supply S/L2 T/L3 * W/T3 Inverter 3G3JX * For 3G3JX-AE ††† 's terminal symbols, R/L1 corresponds to L1, S/L2 to L2, and T/L3 to N/L3. Design „ Wiring the Main Circuit Terminals (Input Side) Installing a Molded-case Circuit Breaker (MCCB) •Always connect the Inverter and power supply via a molded-case circuit breaker (MCCB) to protect the Inverter from damage that may result from short-circuiting.
•Always connect the power input terminals (R/L1, S/L2, and T/L3) and power supply via an MCCB, according to the Inverter capacity. •Install one MCCB per Inverter. •Choose an appropriate MCCB capacity according to the fuse size on page 2-13. •When choosing MCCB's time characteristics, be sure to consider the Inverter's overload protection (1 minute at 150% of the rated output current). •By programming the sequence as illustrated below, you can turn off the power via the relay outputs (MA, MB, and MC) for the 3G3JX Series.
Molded-case circuit breaker (MCCB) MC X1 R/L1 S/L2 Inverter 3G3JX Power supply T/L3 * X1 X2 OFF ON X2 MA MC (30 V DC, 50 mA max.) X1 DC (24 V) relay * For 3G3JX-AE ††† 's terminal symbols, R/L1 corresponds to L1, S/L2 to L2, and T/L3 to N/L3. Installing a Ground Fault Interrupter •The Inverter's output uses high-speed switching, and so generates high-frequency current leakage. (Generally, if the power cable is 1 m, the leakage current is approx. 100 mA per Inverter, and approx.
5 mA is added per additional meter of the power cable.) •At the power supply input part, install a special-purpose ground fault interrupter for Inverters that excludes high-frequency leakage current and detects only the leakage current within a frequency range that is hazardous to humans. (Choose a ground fault interrupter with a sensitivity current of at least 10 mA per Inverter.) •Alternatively, use a general ground fault interrupter with a sensitivity current of 200 mA or more per Inverter, and with an operating time of 0.1 s or more. 2-16