AC80T Tower Crane Purpose VFD Manual
41
Over voltage diagnoses process
ACC over
voltage(OU1)
DCC over
voltage(OU2)
Constant speed
over voltage(OU3)
Stop state over
voltage(OU4)
Fower votage in fixed range or not
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Reduce power voltage
into fixed range
Clear short circuit
Phase or earth short cirsuit bwteen U/V/W and motor
Stop motor and restart.
Or DC braking,then
start(F1.00:1). Or speed
track start(F1.00:2)
Whether it stops while restart the motor
Whether act while load suddently changes to"0"
Whether DC circuit voltage of main loop is above protection value while act
Maybe inverter fault or
misact.Plese seek for
technic support
Whether act while
suddently stop ACC
Can prolong DCC time or not
prolong
ACC time can be
prolong or not
Load intertia can be reduced or not
Whether used braking unit or DC braking function
Please check braking unit and seek for technic support
Use braking unit or DC
braking function
Reduce
