Chapter 5
Error Codes
5-2
Inst.P-F
Under.V
CT
CPU
EXTERNAL
USP
GND.Flt
OV.SRC
OH.stFAN
OH.fin
Name
Description
Display on digital
operator
Display on remote
operator
Troubleshooting and corrective action
Referenc
e page
Undervoltage
If the inverter input voltage drops, the
control circuit of the inverter cannot
function normally. Therefore, the inverter
shuts off its output when the input voltage
falls below a specified level.
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).
Check whether the power supply voltage has dropped.
(Check the power supply.)
Check whether the power supply capacity is sufficient.
(Check the power supply.)
Check whether the thyristor has been damaged.
(Check the thyristor.)
4-25
CT error
If an error occurs in the internal current
detector (CT), the inverter will shut off its
output and display the error code shown on
the right. The inverter will trip when the CT
outputs about 0.6 V or more at power-on.
Check whether the inverter has failed.
(Repair the inverter.)
-
CPU error (*3)
If the internal CPU malfunctions or an error
occurs in it, the inverter will shut off its
output and display the error code shown on
the right.
Note: Reading an abnormal data from the
EEPROM may result in a CPU error.
Check for the noise sources located near the inverter.
(Remove noise sources.)
Check whether the inverter has failed.
(Repair the inverter.)
-
External trip
If an error occurs in the external equipment
or device connected to the inverter, the
inverter will fetch the error signal and shut
off its output. (This protective function is
enabled when the external trip function is
enabled.)
Check whether an error has occurred in the external
equipment (when the external trip function has been
enabled).
(Recover the external equipment from the error.)
4-56
USP error
A USP error is indicated when the inverter
power is turned on with an input operation
signal remaining in the inverter. (This
protective function is enabled when the USP
function is enabled.)
Check whether the inverter power has been turned on
with an input operation signal remaining in the
inverter (when the USP function has been enabled).
(Reset the operation command, and then turn on the
inverter power.)
4-55
Ground-fault
protection (*3)
When the inverter power is turned on, this
protective function detects the ground fault
between the inverter output circuit and the
motor to protect the inverter. (This function
does not operate when a residual voltage
remains in the motor.)
Check for the ground fault.
(Check the output cables and motor.)
Check the inverter itself for abnormality.
(Remove the output cables from the inverter, and then
check the inverter.)
Check the main circuit for abnormality.
(Check the main circuit with reference to
Chapter 6.) (Repair the inverter.)
-
Input
overvoltage
protection
This protective function determines an error
if the input voltage is kept above the
specification level for 100 seconds while the
inverter is stopped.
The inverter will trip if the DC voltage of the
main circuit is kept above about 390 VDC (in
case of the 200 V class models) or about 780
VDC (in case of the 400 V class models).
Check whether the input voltage is high while the
inverter is stopped.
(Lower the input voltage, suppress the power voltage
fluctuation, or connect an AC reactor between the
power supply and the inverter input.)
-
Instanta-
neous power
failure
protection
If an instantaneous power failure lasts 15 ms
or more, the inverter will shut off its output.
When the power failure duration is long, the
inverter assumes a normal power-off. If a
restart mode has been selected and an
operation command remains in the inverter,
the inverter will restart after the power is
recovered.
Check whether the power supply voltage has dropped.
(Recover the power supply.)
Check the MCB and magnetic contactors for poor
contacts.
(Replace the MCB and the magnetic contactor.)
4-34
Temperature
error due to
low cooling-fan
speed
The inverter will display the error code
shown on the right if the lowering of
cooling-fan speed is detected at the
occurrence of the temperature error
described below.
Check whether the cooling efficiency has been
lowered.
(Replace the cooling fan.)
Check the heat sink for clogging.
(Clean the heat sink.)
-
Temperature
error
If the main circuit temperature rises
because of a high ambient temperature or
for other reasons, the inverter will shut off
its output.
Check whether the inverter is installed vertically.
(Check the installation.)
Check whether the ambient temperature is high.
(Lower the ambient temperature.)
-
*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.
Summary of Contents for SJ700D-004L
Page 16: ...Contents Appendix Appendix A 1 Index Index Index 1 ...
Page 44: ...Chapter 2 Installation and Wiring 2 23 Memo ...
Page 70: ...Chapter 3 Operation 3 25 Memo ...
Page 248: ...Chapter 5 Error Codes 5 11 Memo ...
Page 256: ...Chapter6 Maintenance and Inspection 6 7 Memo ...