FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERSSpecial operation and frequency control4.25.2 Bypass-inverter switchover function (Pr. 57, Pr. 58, Pr. 135 to Pr. 139, Pr. 159)The complicated sequence circuit for bypass operation is built in the inverter. Hence, merely inputting the start,stop or automatic switchover selection signal facilitates the interlock operation of the switchover magneticcontactor.ParameterNumberNameInitialValueSetting Range Description⋅ 5.5K, 7.5K................................................... 1s,0 ⋅ 11K or more ................................................ 3.0s,The above times are coasting time.57 Restart coasting time 9999Set the waiting time for inverter-triggered restart after an0.1 to 5sinstantaneous power failure.9999 No restart58 Restart cushion time 1s 0 to 60s Set a voltage starting time at restart.135Electronic bypasssequence selection136MC switchover interlocktime137 Start waiting time 0.5s 0 to 100s00 Without electronic bypass sequence1 With electronic bypass sequence1s 0 to 100s Set the operation interlock time of MC2 and MC3.Set the time slightly longer (0.3 to 0.5s or so) than the time fromwhen the ON signal enters MC3 until it actually turns on.0 Inverter output is stopped (motor coast) at inverter fault.Bypass selection at a1380Operation is automatically switched to bypass operation atfault1 inverter fault (Not switched when an external thermal relayoperation (E.OHT) or CPU error (E.CPU) occurs).Set the frequency to switch inverter operation to bypassoperation.Automatic switchoverInverter operation is performed from a start until Pr. 139 is0 to 60Hz139 frequency from inverter 9999reached, and when the output frequency is at or above Pr.to bypass operation139, inverter operation is automatically switched to bypassoperation.9999 Without automatic switchoverValid during automatic switchover operation (Pr. 139 ≠ 9999)When the frequency command decreases below (Pr. 139 -Pr. 159) after operation is switched from inverter operation to0 to 10Hz bypass operation, the inverter automatically switchesoperation to inverter operation and operates at theAutomatic switchoverfrequency of frequency command. When the inverter startfrequency range from1599999command (STF/STR) is turned off, operation is switched tobypass to inverterinverter operation also.operationValid during automatic switchover operation (Pr. 139 ≠ 9999)When the inverter start command (STF/STR) is turned off9999 after operation is switched from inverter operation to bypassoperation, operation is switched to inverter operation andthe motor decelerates to stop.⋅ When the motor is operated at 60Hz (or 50Hz), more efficient operation can be performed by the commercial powersupply than by the inverter. When the motor cannot be stopped for a long time for the maintenance/inspection of theinverter, it is recommended to provide the commercial power supply circuit.⋅ To switch between inverter operation and bypass operation, an interlock must be provided to stop the motor onceand then start it by the inverter in order to prevent the inverter from resulting in an overcurrent alarm. Using theelectronic bypass sequence function that outputs the timing signal for operation of the magnetic contactor, acomplicated commercial power supply switchover interlock can be provided by the inverter.CAUTIONCommercial operation can not be performed with the Mitsubishi vector motor (SF-V5RU).337