Hitachi SJ700D-004L, Instruction Manual

Page: 238 / 288

Chapter 5 Error Codes
5-1
OC.Drive
OC.Decel
OC.Accel
Over.C
Over.L
OL.BRD
Over.V
EEPROM
5.1 Error Codes and Troubleshooting
5.1.1 Error Codes
Name Description
Display on digital
operator
Display on remote
operator
Troubleshooting and corrective action
Reference
page
Overcurrent
protection
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
than a specified level.
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.
During
constant-
speed
operation
Check whether the load has fluctuated sharply.
(Eliminate the load fluctuation.)
Check for the short circuit of output connections.
(Check the output cables.)
Check for the ground fault or phase loss.
(Check the output cables and motor.)
-
During
deceleration
Check whether the inverter has decelerated the
motor quickly.
(Increase the deceleration time.)
4-10
4-31
During
acceleration
Check whether the inverter has accelerated the
motor quickly.
(Increase the acceleration time.)
Check whether the motor has been locked or check
for phase loss. (Check the motor and wiring.)
Check whether the torque boost current has been
set too high.
(Reduce the boost current.)
4-10
4-31
Others
Check whether the DC braking force is too high.
(Reduce the braking force.)
Check whether the current detector (CT) is normal.
(Replace or repair the CT.)
4-21
Overload
protection
(*1)
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 detects a motor
overload.
If the error occurs, the inverter will trip
according to the setting of the electronic
thermal function.
Check whether the motor load is too high.
(Reduce the load factor.)
Check whether the thermal level is appropriate.
(Adjust the level appropriately.)
Check for phase loss.
(Check the output cables and motor.
Note:
The electronic thermal protection is easily 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.
4-38
Braking
resistor
overload
protection
When the BRD operation rate exceeds the
setting of "b090", this protective function
shuts off the inverter output and displays the
error code shown on the right.
Check whether the inverter has decreased the
motor quickly.
(Increase the deceleration time.)
Check whether the operation cycle is too short.
(Prolong the operation cycle.)
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.
4-10
4-44
Overvoltage
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 level because of
an increase in the energy 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).
Check whether the inverter has decreased the
motor quickly.
(Increase the deceleration time.)
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.)
-
EEPROM
error
(*2) (*3)
When an internal-EEPROM is caused by
external noise or an abnormal temperature
rise, the inverter shuts off its output and
displays the error code shown on the right.
Note: An EEPROM error may result in a CPU
error.
Check for the noise sources located near the
inverter.
(Remove noise sources.)
Check whether the cooling efficiency has
deteriorated.
(Check the heat sink for clogging, and clean it.)
(Replace the cooling fan.)
-
*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 displayed. Turn off the 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.