Hitachi SJ7002 Series Instruction Manual page 255

6–8
Monitoring Trip Events, History, & Conditions
OPE / SRW
Display
E 1 1.-
CPU
E 12.-
EXTERNAL
E 13.-
USP
E 14.-
GND.Flt
E 15.-
OV.SRC
E 16.-
Inst.P-F
E20.-
OH.stFAN
E2 1.-
OH.fin
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Name
CPU error (*5) 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 left.
Note: Reading abnormal data from the
EEPROM may result in a CPU error.
External trip If an error occurs in the external equip-
ment or device connected to the inverter,
the inverter will latch the error signal and
shut off its output. (This protective
function is active when the external trip
function is enabled.)
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 active when
the USP function is enabled.)
Ground fault When the inverter power is turned ON,
protection (*5) 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.)
Input over- This protective function determines an
voltage error if the input voltage is kept above the
protection 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).
Instantaneous If an instantaneous power failure lasts
power failure 15 ms or more, the inverter will shut off
protection 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.
Temperature The inverter will display the error code
error due to shown on the left if the lowering of
low cooling- cooling fan speed is detected at the occur-
fan speed rence of the temperature error described
below.
Temperature If the main circuit temperature rises
error because of a high ambient temperature or
for other reasons, the inverter will shut
OFF its output.
Note 5: 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.
Description
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Troubleshooting and
Corrective Action
Check for the noise sources located near
the inverter (remove noise sources).
Check whether the inverter has failed
(repair the inverter).
If the inverter's external trip function is
enabled, check whether an error has
occurred in external equipment (clear the
error in the external equipment).
If the USP function has been enabled,
check whether the inverter power has
been turned on with an input operation
signal remaining in the inverter (reset the
operation command, and then turn ON the
inverter power).
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
(use testing methods described in this
chapter and repair the inverter).
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.)
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).
Check whether the cooling efficiency has
been lowered (replace the cooling fan).
Check the heat sink for clogging (clean
the heat sink).
Check whether the inverter is installed
vertically (check the installation.)
Check whether the ambient temperature
is high (lower the ambient temperature).