N700 Operating Instructions and Parts Manual
14. Protection function
148
14. P
ROTECTION FUNCTION
14.1
Protection function
Name
Description
Display of
standard
operator
Display of
digital
operator
At constant speed
E01
OC.CON
On acceleration speed
E02
OC.ACC
On deceleration speed
E03
OC.DEC
Over-current
protection
When motor is restricted and decelerates rapidly,
excessive current flows back to the inverter and
it could damage the inverter. This protection
turns on current protection circuit operates and
the inverter output stop.
Other E04
OC.ETC
Overload
protection
When the inverter detects an overload in the motor, the internal electronic
thermal overload activates and the inverter output is switched off.
E05 OL.MOT
Braking resistor
overload
protection
When BRD exceeds the usage ratio of the regenerative braking resistor,
the over-voltage circuit activates and the inverter output is switched off.
E06 OL.DBR
Overvoltage
protection
When regenerative energy from the motor exceeds the maximum level, the
over -voltage circuit activates and the inverter output is switched off.
E07 OV.DC
Under-voltage
protection
When the incoming voltage of inverter is low, the control circuit can't
operate correctly.
In this case, the under -voltage circuit activates and the inverter output is
switched off.
E09 UV.DC
External trip
When a signal is given to the EXT intelligent input terminal, the inverter
output is switched off.
(on external trip function select)
E12 EXT.ERR
USP error
This error is displayed when the inverter power is restored while running.
(Valid when the USP function is selected)
E13 USP.ERR
Ground fault
protection
When power is turned ON, this detects ground faults between the inverter
output and the motor.
E14 GND.FLT
Temporary
power loss
protection
When an instantaneous power failure occurs for more than 15ms, the
inverter output is switched off.
Once the instantaneous power failure wait time has elapsed and the power
has not been restored, it is regarded as a normal power failure.
However, when the operation command is still ON with restart selection,
the inverter will restart. So please be careful of this.
E16 IPF.ERR
Abnormal
temperature
When main circuit temperature rises abnormally high by stopping the
cooling fan, the inverter output is switched off.
E17 OT.ERR
When an R opens - phase on the input supply occurs the inverter output is
switched off.
E20 R
PH.ERR
When an S opens - phase on the input supply occurs the inverter output is
switched off.
E21 S
PH.ERR
Open-phase
protection
When a T opens - phase on the input supply occurs the inverter output is
switched off.
E22 T
PH.ERR
Thermistor error
When the inverter detects a high resistance on the thermistor input from
the motor, the inverter output is switched off.
E24 THMIS.ERR
Abnormal brake
When inverter cannot detect switching of the brake(ON/OFF) after
releasing the brake and for signal condition. When the braking control
selection is enable.
E25 BRK.ERR
Communication
error
This error is displayed, when communication timeout occurs between the
inverter and the operator.
E26 COMM.ERR
Overtime of reset
input
This error is displayed when input time of the reset signal exceeds the
setting time 5seconds
E27 RESET.ERR