EM500 Open-Loop Vector Control Inverter User Manual 3.2.5Wiring on Input Side of Main Circuit 3.2.5.1Circuit Breaker Installation supply and input terminals. An air circuit breaker (MCCB) corresponding to inverter is required between power The capacity of MCCB shall be 1.5 to 2 times that of the rated current of inverter. The time characteristics of MCCB must meet the time characteristics of When MCCB is used with multiple inverters or other devices, please the overheating protection of inverter (150% rated current/1 minute). connect the contactor of the fault output relay to power contactor coil, so that the power supply will be turned off by a fault signal (Figure 3-5).
MCCB R EM500 S Inverter EB T Fault Relay Contactor OFF ON EC MC Figure 3-5 Connecting to Input Circuit Breaker 3.2.5.2Leakage Circuit Breaker Installation Inverter outputs high-frequency PWM signal, which generates high-frequency leakage current. Please select a leakage circuit breaker with trigger current ≥ 30mA. For a regular circuit breaker, the trigger current ≥ 200mA and the active time at 0.1 s or above. 3.2.5.3Electromagnetic Contactor Installation Connect the electromagnetic contactor corresponding to inverter power as shown in Figure 3-4. Do not control the start or stop of inverter with the electromagnetic contactor on the input side.
Frequent use of this method is an important cause of damaging inverter. The operation interval between start and stop of inverter 40