Chapter 13 – The optional remote operators
13-6
Protective functions
Cause Description
Message
During con-
stant speed
OC. Drive
Deceleration
OC. Decel
Acceleration
OC. Accel
Overcurrent
protection
When the output of the inverter is
short circuited, the motor is locked, or
a heavy load is suddenly applied, and
the inverter output current exceeds a
predetermined level, the inverter is
shut off.
At the others
Over. C
Overload
protection
When a motor overload is detected by the electronic
thermal function, the inverter is shut off
Over. L
When the inverter DC bus voltage exceeds a
predetermined level due to regenerative energy from the
motor, this trip occurs and the inverter is shut off.
Over. V
Overvoltage
protection
100s after the input power supply voltage has exceeded
the allowable voltage limit, the output voltage will be
switched off.
OV. SRC
EEPROM error
When the inverter memory has a problem due to noise
or excessive temperature rise, this trip occurs and the
inverter is shut off.
EEPROM
Undervoltage
protection
A decrease of DC bus voltage may result in improper
function of the control unit. It may also cause motor
heating and low torque. The inverter is shut off when the
DC bus voltage goes below a certain level.
Under. V
CPU1
CPU error
Malfunction or abnormality of the CPU.
The inverter is shut off.
CPU2
External trip
A trip signal from external equipment shuts off the
inverter. It is necessary to assign the external trip to an
intelligent input terminal.
EXTERNAL
USP error
Indicates an error when power is turned on while the
inverter run is enabled (when USP function is selected).
USP
Ground fault
protection
The inverter is protected by detection of ground faults
between the drive output and the motor at power on.
Protection is for the inverter only and not for humans.
GND. Flt
Thermal
protection
When the temperature of the inverter module is beyond
specification, the thermal sensor in the inverter module
detects the temperature and the inverter is shut off.
OH FIN
PTC error
When the resistance value of the external thermistor is
too large, the equipment detects the abnormal condition
of the thermistor and then shuts off the inverter (when
PTC function is selected).
PTC
Содержание L100 IP Series
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