Protection Function List - Hitachi L300P-110L Instruction Manual

4.4 Protection function list

4.4.1 Protection function
Name
Over-current protection
Overload protection (note 1)
Braking resistor overload
Protection
Over-voltage protection
EEPROM error (note 2)
Under-voltage
CT error
CPU error
External trip
USP error
Ground fault protection
Incoming over-voltage
protection
Temporary power loss
protection
Abnormal temperature
Gate Array error
Open-phase protection
IGBT error
Description
Motor is restricted and decelerates
rapidly, excessive current is drawn
through the inverter and there is a
risk of damage. Current protection
circuit operates and the inverter
output is switched off.
When the Inverter detects an overload in the motor,
the internal electronic thermal overload operates and
the inverter output is switched off.
When BRD exceeds the
regenerative
braking resistor, the over-voltage circuit operates and
the inverter output is switched off.
When regenerative energy from the motor exceeds
the maximum level, the over-voltage circuit operates
and the inverter output is switched off.
When EEPROM in the inverter is subject to radiated
noise or unusual temperature rises, the inverter
output is switched off.
When the incoming voltage of inverter is low, the
control
circuit can't operate correctly. The under-voltage
circuit operates and the inverter output is switched
off.
When an abnormality occurs to a CT (current
detector) in the inverter, the inverter output is
switched off.
When a mistaken action causes an error to the built-
in CPU, the inverter output is switched off.
When a signal is given to the EXT intelligent input
terminal, the inverter output is switched off.
(on external trip function select)
This is the error displayed when the inverter power is
restored while still in the RUN mode.
(Valid when the USP function is selected)
When power is turned ON, this detects ground faults
between the inverter output and the motor.
When the incoming voltage is higher than the
specification value, this detects it for 100 seconds
then the over-voltage circuit operates and the inverter
output is switched off.
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.
When main circuit temperature raises by stopping of
cooling fan, the inverter output is switched off.
Communication error between CPU and gate array
indicate
When an open-phase on the input supply occurs the
inverter output is switched off.
When an instantaneous over-current is detected on
the output the inverter output is switched off to protect
the main devices.
4-75
Chapter 4 Explanation of function
Display of
digital panel･
digital
operator
At constant
Speed
On
deceleration
speed
On acceleration
speed
Other
usage ratio of the
Display of remote
operator/
Copy unit ERR1***
OC. Drive
OC. Decel
OC. Accel
Over. C
Over. L
OL. BRD
Over. V
EEPROM
Under. V
CT
CPU
EXTERNAL
USP
GND. Flt
OV. SRC
Inst. P-F
OH. FIN
GA
PH. Fail
IGBT