Error Codes And Troubleshooting; Error Codes - Hitachi SJ700-2 Instruction Manual

5.1 Error Codes and Troubleshooting

5.1.1 Error Codes

Name Description
If the motor is constrained
or suddenly accelerated
or decelerated, a high
current will flow in the
inverter and the inverter
may fail. To avoid this
problem, the inverter
shuts off its output and
displays the error code
shown on the right when it
detects a current higher
Overcurrent
than a specified level.
protection
This protective function
uses a DC current
detector (CT) to detect
overcurrent.
When a current as high as
about 220% of the
inverter's rated output
current is detected, the
protective circuit operates
and the inverter trips.
This protective function monitors the
inverter output current, and shuts off the
inverter output and displays the error code
shown on the right when the internal
electronic thermal protection circuit
Overload detects a motor overload.
protection If the error occurs, the inverter will trip
(*1) according to the setting of the electronic
thermal function.
When the BRD operation rate exceeds
the setting of "b090", this protective
function shuts off the inverter output and
Braking displays the error code shown on the
resistor right.
overload
protection
If the DC voltage across the P and N
terminals rises too high, an inverter failure
may result. To avoid this problem, this
protective function shuts off the inverter
output and displays the error code shown
on the right when the DC voltage across
the P and N terminals exceeds a specified
Overvoltage
level because of an increase in the energy
protection
regenerated by the motor or the input
voltage (during operation).
The inverter will trip if the DC voltage
across the P and N terminals exceeds
about 400 VDC (in case of the 200 V class
models) or about 800 VDC (in case of the
400 V class models).
When an internal-EEPROM is caused by
external noise or an abnormal
EEPROM temperature rise, the inverter shuts off its
error output and displays the error code shown
(*2) (*3) on the right.
Note: An EEPROM error may result in a
CPU error.
*1 The inverter will not accept any reset command within about 10 seconds after tripping (i.e., after the protective function operates).
*2 The inverter will not accept any reset command after an EEPROM error occurs with error code
inverter power once. If error code "E08" is displayed when the inverter power is turned on subsequently, the internal memory
device may have failed or parameters may have not been stored correctly. In such cases, initialize the inverter, and then re-set the
parameters.
*3 The inverter will not accept reset commands input via the RS terminal or entered by the STOP/RESET key. Therefore, turn off the
inverter power.
Display on
digital operator
During
constant-
speed
operation
During
deceleration
During
acceleration
Others
5 - 1
Display on
Troubleshooting and corrective action
remote operator
Check whether the load has fluctuated sharply.
Check for the short circuit of output
connections.
OC.Drive
Check for the ground fault.
(Check the output cables and motor.)
Check whether the inverter has decelerated the
motor quickly.
OC.Decel
Check whether the inverter has accelerated the
motor quickly.
Check whether the motor has been locked.
OC.Accel
Check whether the torque boost current has
been set too high.
Check whether the DC braking force is too high.
Check whether the current detector (CT) is
Over.C
normal.
Check whether the motor load is too high.
Check whether the thermal level is appropriate.
Note:
The electronic thermal protection is easily
Over.L
triggered when the output frequency is 5 Hz or
less. If the moment of inertia of the load is large,
this protective function may operate when the
inverter accelerates the motor and the
acceleration may be disabled. If this problem
occurs, increase the torque boost current or
adjust other settings as needed.
Check whether the inverter has decreased the
motor quickly.
Check whether the operation cycle is too short.
OL.BRD
Check whether the set BRD operation rate is
too low.
(Adjust the setting to an appropriate level.)
Note: confirm the maximum allowable capacity
of the resistor.
Check whether the inverter has decreased the
motor quickly.
Over.V
Check for a ground fault.
(Check the output cables and motor.)
Check whether the motor has been rotated by
the action of the load.
(Reduce the regenerative energy.)
Check for the noise sources located near the
inverter.
Check whether the cooling efficiency has
EEPROM
deteriorated.
(Check the heat sink for clogging, and clean it.)
Chapter 5 Error Codes
(Eliminate the load fluctuation.)
(Check the output cables.)
(Increase the deceleration time.)
(Increase the acceleration time.)
(Check the motor and wiring.)
(Reduce the boost current.)
(Reduce the braking force.)
(Replace or repair the CT.)
(Reduce the load factor.)
(Adjust the level appropriately.)
(Increase the deceleration time.)
(Prolong the operation cycle.)
(Increase the deceleration time.)
(Remove noise sources.)
(Replace the cooling fan.)
displayed. Turn off the
Reference
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4-10
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4-10
4-31
4-21
4-38
4-10
4-44
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