EM600 High-Performance Vector Control Inverter User Manual 3.2.5 Wiring of Main Circuit on Input Side 3.2.5.1 Circuit Breaker Installation An air circuit breaker (MCCB) matching with inverter shall be installed between power supply and input terminal. MCCB capacity shall be 1.5 to 2 times that of rated current of inverter. MCCB must meet time characteristics of overheating protection of inverter (150% rated current/1 minute). When MCCB is used with multiple inverters or other devices, please connect fault output relay contactor to power contactor coil, so that power supply will be turned off by fault signal (Figure 3-5).
EM600变频器 EM600 Inverter MCCB S R EB T OFF ON 故障继电 Fault Relay 器触点 Contactor MC EC Figure 3-5 Connecting to Input Circuit Breaker 3.2.5.2 Leakage 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 regular circuit breaker, trigger current shall be ≥ 200mA and active time at 0.1 s or above. 3.2.5.3 Electromagnetic Contactor Installation Connect electromagnetic contactor maching with inverter power as shown in Figure 3-4. Do not control inverter start or stop with electromagnetic contactor on the input side.
Frequent use of this method is an important cause of damaging the inverter. Operation interval between inverter start and stop shall not be longer than 30 minutes. Inverter will not automatically start after power failure. 3.2.5.4 Connection to Terminal Block Input power can be connected to R, S and T randomly irrespective of their phase sequence on terminal block. 3.2.5.5 AC Reactor Installation Excessive surge current may be generated when inverter is connected to a large capacity (over 600 KVA) power transformer or input power supply is connected to a capacitive load, and this may damage rectifier.
Connect a 3-phase AC reactor (optional) to input side of inverter, which not only suppresses peak current and voltage, but also improves power factors of system. 3.2.5.6 Surge Suppressor Installation It’s required to install a surge suppressor, if there is an inductive load near inverter, for example electromagnetic contactor, solenoid valve, solenoid coil and electromagnetic circuit breaker. 32