Fuji Electric FRENIC MEGA G2 Series - Page 326

5.3 Description of Function Codes 5.3.2 E codes (Extension terminal functions)
5-142
<Operation timing scheme>
• When the motor speed remains almost the same during free run:
Fig. 5.3-2
• When the motor speed decreases significantly during free run (with the current limiter activated)
Fig. 5.3-3
• Secure more than 0.1 second after turning ON the “Switch to commercial power” signal before turning
ON a run command.
• Secure more than 0.2 second of an overlapping period with both the “Switch to commercial power”
signal and run command being ON.
• If an alarm has been issued or BX has been ON when the motor drive source is switched from the
commercial power to the inverter, the inverter will not be started at the commercial power frequency
and will remain OFF. After the alarm has been reset or “BX” turned OFF, operation at the frequency of
the commercial power will not be continued, and the inverter will be started at the ordinary starting
frequency.
If you wish to switch the motor drive source from the commercial line to the inverter, be sure to turn
“BX” OFF before the “Switch to commercial power” signal is turned OFF.
• When switching the motor drive source from the inverter to commercial power, adjust the inverter’s
reference frequency at or slightly higher than that of the commercial power frequency beforehand,
taking into consideration the motor speed down during the coast to stop period produced by switching.
• Note that when the motor drive source is switched from the inverter to the commercial power, a high
inrush current will be generated, because the phase of the commercial power usually does not match
the motor speed at the switching. Make sure that the power supply and all the peripheral equipment
are capable of withstanding this inrush current.
• If you have enabled “Restart mode after momentary power failure” (F14 = 3, 4, or 5), keep “BX” ON
during commercial power driven operation to prevent the inverter from restarting after a momentary
power failure.
Switch to commercial power “SW50”
Run command “FWD”
Coast to a stop command “BX”
Commercial power
frequency
Motor speed
Restart mode after momentary
power failure (H13)
Inverter reference
frequency
Inverter output
frequency
Inverter start at commercial
power frequency
0.2s or more
0.1s or more
0.1s or more
0.2s or more
Switch to commercial power “SW50”
Run command “FWD”
Coast to a stop command “BX”
Commercial power
frequency
Motor speed
Restart mode after momentary
power failure (H13)
Inverter output
frequency
Inverter reference
frequency
Inverter start at commercial
power frequency