When power failure occurs in the input power, DC link voltage of the inverter gets low and low
voltage defect occurs resulting a cut of the output. Its function is to maintain the voltage of DC
link by controlling output frequency of the inverter during the time of power failure. That is, it
can keep the time from the point of power failure to low voltage defect long.
Selects energy buffering operation when input power is cut. If H64 is set to 0, it operates
normal deceleration run until low voltage occurs. When H64 is set to 1, it controls the inverter
output frequency and charges the energy occurred from the motor to the inverter DC.
H 65(KEB operation start level), H 66(KEB operation stop level) : Selects starting and stopping
point of the energy buffering operation. Set the stop level(H65) higher than the start level(H 66)
setting the low voltage defect level as standard.
H 37(Load inertia) : Uses the momentum amount of the load inertia to control energy buffering
operation. If the inertia ratio is set high, the frequency change range gets small when running
energy buffering.
8.20 DRAW drive
It‟s a kind of open loop tension control that uses the speed difference of motor running under
main frequency command to keep material‟s tension in between steady.
The ratio reflected in the output frequency differs according to the selection of F70(DRAW
mode select)
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