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N700E INSTRUCTION MANUAL
6-1
6. Protective function
The various functions are provided for the protection of the inverter itself, butthey may also protection
function when the inverter breaks down.
Name
Cause(s)
Error
Code
Overcurrent
protection
When the inverter output current exceeds the rated current by more than
approximately 200% duringthe motor locked or reduced in speed.
Protection circuit activates, halting inverter output.
E04
Overload protection
(Electronic thermal)
Regenerative
When the inverter output current causes the motor to overload,
the electronic thermal trip in the inverter cuts off the inverter output.
E05
Over voltage
protection
If regenerative energy from the motor or the main power supply voltage
is high, the protective circuit activates to cut off the inverter output when
the voltage of DC link exceeds the specification
E07
Communication
error
Communication error between inverter and its operator.
If the Reset signal persists for more than 4 seconds, it will occur.
E60
Under-voltage
protection
When input voltage drops below the low-voltage detection level,
the control circuit does not function normally.
So when the input voltage is below the specification, the inverter
output is cut off.
E09
Output
short-circuit
The inverter output was short-circuited.
This condition causes excessive current for the inverter, sothe inverter
output is turned off.
E04 or
E34
USP error
The USP error is indicated when the power is turned on with the
Inverterin RUN state. (Enabledwhen the USP function selected)
E13
EEPROM
The inverter output is cut off when EEPROM in the inverter has an error
due to external noise, excessive temperature rise, or other factor
E08
External trip
When the external equipment or unit has an error,the inverter receives
the corresponding signal andcuts off the output.
E12
Input phase loss
A function that detects phase loss in the input AC source. Detection is
performed using the fluctuation in the main circuit's DC voltage. Also,in
the case of degradation of main capacitors it could be occurred.
E20
Temperature trip
When the temperature in the main circuit increasesdue to cooling fan
stop, the inverter output is cut off.
(only for the model type with cooling fan)
E21
Ground fault
When ground fault is detected on running condition, the output is cut off.
E14
Inverter Overload
The power device IGBT is protected from over heat. The operating time
of inverter is 1 minute with 150% load of HD or 120% load of ND.
The operating time is changed depending on carrier frequency, load,
ambient temperature and power rating.
E17
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