Hitachi SJ300 Series

21
PROTECTIVE FUNCTIONS
Name
Display
on digital
operator
Display on remote
operator/copy unit
Cause(s)
Over-current
protection
Overload
protection(*1)
Braking resistor
overload protection
Over-voltage
protection
EEPROM error(*2)
Under-voltage error
CT(Current
transformer) error
CPU error
External trip
USP error
Ground fault
Input over-voltage
protection
Instantaneous
power failure
Inverter thermal trip
Gate array error
Phase loss detection
IGBT error
Thermistor error
Braking error
Out of operation due
to under-voltage
Expansion card 1 connection error
Expansion card 2 connection error
Communication error has occurred between CPU and gate array.
One of three lines of 3-phase power supply is missing.
An error has been detected in an expansion card or at its connecting terminals.
While at constant speed
During deceleration
During acceleration
Others
When the built-in EEPROM memory has problems due to noise or excessive temper-
ature, the inverter trips and turns off its output.
When a signal to an intelligent input terminal configured as EXT has occurred, the
inverter trips and turns off its output.
An error occurs when power is cycled while the inverter is in RUN mode if the Unat-
tended Start Protection (USP) is enabled. The inverter trips and does not go into
RUN mode until the error is cleared.
When the input voltage is higher than the specified value, it is detected 60 seconds
after power-up and the inverter trips and turns of its output.
When power is cut for more than 15ms, the inverter trips and turns off its output. If
power failure continues, the error will be cleared. The inverter restarts if it is in RUN
mode when power is cycled.
The inverter turns off its output when it can not detect whether the braking is ON or OFF within waiting time
set at b024 after it has released the brake. (When braking is enabled at b120)
When the DC bus voltage exceeds a threshold, due to regenerative energy from the
motor, the inverter trips and turns off its output.
When a motor overload is detected by the electronic thermal function, the inverter
trips and turns off its output.
The inverter output was short-circuited, or the
motor shaft is locked or has a heavy load. These
conditions cause excessive current for the invert-
er, so the inverter output is turned off.
When the regenerative braking resistor exceeds the usage time allowance or an over-
voltage caused by the stop of the BRD function is detected, the inverter trips and
turns off its output.
A decrease of internal DC bus voltage below a threshold results in a control circuit
fault. This condition can also generate excessive motor heat or cause low torque. The
inverter trips and turns off its output.
If a strong source of electrical interference is close to the inverter or abnormal opera-
tions occur in the built-in CT, the inverter trips and turns off its output.
The inverter is protected by the detection of ground faults between the inverter out-
put and the motor during power-up tests. This feature protects the inverter only.
When the inverter internal temperature is higher than the specified value, the ther-
mal sensor in the inverter module detects the higher temperature of the power devic-
es and trips, turning off the inverter output.
When an instantaneous over-current has occurred, the inverter trips and turns off its
output to protect main circuit element.
When the thermistor inside the motor detects temperature higher than the specified
value, the inverter trips and turns off its output.
Due to insufficient voltage, the inverter has turned off its output and been trying to
restart. If it fails to restart, it goes into the under-voltage error.
When a malfunction in the built-in CPU has occurred, the inverter trips and turns off its output.
〈How to access the details about the present fault〉
〈Status Display〉
Status at trip pointError code
Output frequency
at trip point
Motor current
at trip point
Voltage between
P(+) and N(
−
) at trip point
Cumulative inverter
RUN time at trip point
Cumulative power-on
time at trip point
OC.Drive
ERR1****
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
TH
BRAKE
UV.WAIT
OP1-0 OP1-9
OP2-0 OP2-9
〜
〜
Code CodeDescription Description
Reset
Stop
Deceleration
Constant Speed
Acceleration
0
1
2
3
4
5
6
7
8
9
f0 Stop
Starting
DB
Overload Restriction
Auto-tuning
〜
〜
Check the parameters when EEP ROM error occurs.Reset operation is acceptable 10 seconds after the trip.
*2:
*1: