3.6 Checklist before starting operation The FREQROL-CS80 series inverter is a highly reliable product, but incorrect peripheral circuit making or operation/handling method may shorten the product life or damage the product. Before starting operation, always recheck the following points. 60 3. PRECAUTIONS FOR USE OF THE INVERTER 3.6 Checklist before starting operation Checkpoint Countermeasure Refer to page Check by user Crimp terminals are insulated. Use crimp terminals with insulation sleeves to wire the power supply and the motor. — The wiring between the power supply (terminals R/L1, S/L2, T/ L3) and the motor (terminals U, V, W) is correct.
Application of power to the output terminals (U, V, W) of the inverter will damage the inverter. Never perform such wiring. 31 No wire offcuts are left from the time of wiring. Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean. When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the inverter. — The main circuit cable gauge is correctly selected. Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
If the wiring distance is long between the inverter and motor, a voltage drop in the main circuit will cause the motor torque to decrease especially during the output of a low frequency. 32 The total wiring length is within the specified length. Keep the total wiring length within the specified length. In long distance wiring, charging currents due to stray capacitance in the wiring may degrade the fast- response current limit operation or cause the equipment on the inverter's output side to malfunction. Pay attention to the total wiring length. 32 Countermeasures are taken against EMI.
The input/output (main circuit) of the inverter includes high frequency components, which may interfere with the communication devices (such as AM radios) used near the inverter. In such a case, install the optional radio noise filter FR-BIF (for use in the input side only) or the optional line noise filter FR-BSF01 or FR-BLF to minimize interference. 52 On the inverter's output side, there is no power factor correction capacitor, surge suppressor, or radio noise filter installed. Doing so will shut off the inverter output or damage the capacitor or surge suppressor. If any of the above devices is connected, immediately remove it.
— When performing an inspection or rewiring on the product that has been energized, the operator has waited long enough after shutting off the power supply. For a short time after the power-OFF, a high voltage remains in the smoothing capacitor, and it is dangerous. Before performing an inspection or rewiring, wait 10 minutes or longer after the power supply turns OFF, then confirm that the voltage across the main circuit terminals P/+ and N/- of the inverter is low enough using a tester, etc. — The inverter's output side has no short circuit or ground fault occurring. • A short circuit or ground fault on the inverter's output side may damage the inverter module.
• Fully check the insulation resistance of the circuit prior to inverter operation since repeated short circuits caused by peripheral circuit inadequacy or an earth (ground) fault caused by wiring inadequacy or reduced motor insulation resistance may damage the inverter module. • Fully check the to-earth (ground) insulation and phase-to-phase insulation of the inverter's output side before power-ON. Especially for an old motor or use in hostile atmosphere, securely check the motor insulation resistance, etc. — The circuit is not configured to use the inverter's input-side magnetic contactor to start/stop the inverter frequently.
Since repeated inrush currents at power ON will shorten the life of the converter circuit, frequent starts and stops of the magnetic contactor must be avoided. Turn ON or OFF the inverter's start (STF/STR) signal to run or stop the inverter. 58 The voltage applied to the inverter I/O signal circuits is within the specifications. Application of a voltage higher than the permissible voltage to the inverter I/O signal circuits or opposite polarity may damage the I/O devices. Especially check the wiring to prevent the speed setting potentiometer from being connected incorrectly to short terminals 10 and 5. 35