Fuji Electric FRENIC-MEGA, Инструкция по эксплуатации

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5-82
Ch
ap
. 5
FUNCTION C
O
DES
E codes
Operation Schemes
• When the motor speed remains almost the same during coast-to-stop:
• When the motor speed decreases significantly during coast-to-stop (with the current limiter activated):
• 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 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.