Chapter 5 Trouble shooting and maintenance
5-7
5.3 Troubleshooting Flowcharts 7300EV Series
Is failure fully
understood?
Any signs of
burnout and
damage?
Is main loop
I.G.B.T normal
Is the main circuit
diode intact?
Replace I.G.B.T
Replace Diode
Check and replace burnt
and damaged parts
Any abnormalities
in appearances?
Are displays and
indicators of the
operating unit present?
Read fault?
Any fault
display?
Check
Fault log using
parameter F-54 with
▼
key.
Is the DC input
voltage controlling
the power correctly?
Is +5V control
voltage correct.
Is the error
eliminated after
replacing control
board?
Replace the driver board
Check terminals and
wiring
Replace the Led
Perform detailed fault
checks
* to next page
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Replace control board and
digital operating unit
NO
YES
EV Inverter faults
Symptoms other than burn out,
damage, or fuse meltdown in
the inverter?
Fault
messages?
Check according to displayed
fault messages
Visually check controller and
driver boards
Apply power
Any fault
display?
Fault log F-54
Replace defective board
Is LED lit?
NO
Figure 5-1 General troubleshooting flowchart