Error Codes And Troubleshooting - Hitachi NES1-004SB Quick Reference Manual

9.2 Error Codes and Troubleshooting

It is not displayed with the standard panel.
Name
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.
Overcurrent
This protective function uses a
protection
DC current detector (CT) to
detect overcurrent.
When a current as high as about
235%(peak) of the inverter's rated
output current is detected, the
protective circuit operates and the
inverter trips. (*4)
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.
Overload
If the error occurs, the inverter will trip according
protection
to the setting of the electronic thermal function.
(*1)
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
Overvoltage
because of an increase in the energy regenerated
protection
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 the built-in Memory is caused by external
Memory noise or an abnormal temperature rise, the
error inverter shuts off its output and displays the error
(*2) (*3) code shown on the right.
Note: A Memory error may cause a CPU error.
If the inverter input voltage drops, the control
circuit of the inverter cannot function normally.
Therefore, the inverter shuts off its output when
Under the input voltage falls below a specified level.
voltage The inverter will trip if the DC voltage across the P
and N terminals exceeds about 175 VDC (in case
of the 200 V class models) or about 345 VDC (in
case of the 400 V class models).
Current If an error occurs in the internal current detector
detection (CT), the inverter will shut off its output and
error display the error code shown on the right.
If the internal CPU malfunctions or an error occurs
in it, the inverter will shut off its output and display
CPU error
the error code shown on the right.
(*3)
Note: Reading an abnormal data from the built-in
memory 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 a Memory 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.
*4 At the time of trip occurrence, as for the effective-value electric current with the measuring instrument and the current value of the
trip history, a low value may be displayed by timing of the data sampling.
Description
During
constant-
speed
operation
During
deceleration
During
acceleration
Others
Display on digital
Troubleshooting and corrective action
operator
Check whether the load has fluctuated sharply.
Check for the short circuit of output connections.
Check for the ground fault.
Check whether the inverter has decelerated the motor
quickly.
Check whether the inverter has accelerated the motor
quickly.
Check whether the motor has been locked.
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 normal.
Check whether the motor load is too high.
Check whether the thermal level is appropriate.
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.
Check whether the inverter has decreased the motor
quickly.
Check for a ground fault.
Check whether the motor has been rotated by the
action of the load.
Check for the noise sources located near the inverter.
Check whether the cooling efficiency has deteriorated.
(Check the heat sink for clogging, and clean it.)
Check whether the power supply voltage has
dropped.
Check whether the power supply capacity is sufficient.
Check whether the inverter has failed.
Check for the noise sources located near the inverter.
Check whether the inverter has failed.
9 - 3
Chapter 9 Error Codes
(Eliminate the load fluctuation.)
(Check the output cables.)
(Check the output cables and motor.)
(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.)
(Check the output cables and motor.)
(Reduce the regenerative energy.)
(Remove noise sources.)
(Replace the cooling fan.)
(Check the power supply.)
(Check the power supply.)
(Repair the inverter.)
(Remove noise sources.)
(Repair the inverter.)
displayed. Turn off the
Reference
page
7-8
7-22
7-41
7-61
7-63
7-8
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