Fuji Electric FRENIC MEGA G2 Series - Judgment on Service Life

7.4 List of Periodic Replacement Parts
7-8
7.4.1 Judgment on service life
The inverter has the life prediction function for some parts which measures the discharging time or counts the
voltage applied time, etc. The function allows you to monitor the current lifetime state on the LED monitor and
judge whether those parts are approaching the end of their service life. The predicted values should be used only
as a guide since the part life is influenced by the surrounding temperature and other usage environments. (Refer to
Chapter 3 “3.4.5 Reading maintenance information “Maintenance information 5.CHE””.)
Table 7.4-2 Life prediction
Object of life
prediction
Prediction function
End-of-life criteria
Prediction timing
Keypad
“5: MAINTENANCE”
on the LED monitor
DC link bus
capacitor
Measurement of discharging
time
The discharging time of the
DC link bus capacitor when
the main power is turned
OFF is measured, and the
capacity is calculated.
85% or lower than
initial capacitance at
time of shipping
At periodic
inspection
(H98: bit 3 = 0)
5_05
(Capacitance)
85% or lower than
main circuit capacitor
capacitance
(necessary to
measure at startup)
under normal user
operating conditions.
During ordinary
operation
(H98: bit 3 = 1)
5_05
(Capacitance)
Main power supply ON time
count
The time elapsed when the
voltage is applied to the DC
link bus capacitor is counted.
Furthermore, the time is
corrected based on the
capacity measurement.
When 87,600 hours
(10 years) of
operation has been
exceeded
During ordinary
operation
5_26
(Elapsed time)
5_27
(Remaining time)
Electrolytic
capacitors
on PCBs
The time elapsed when the
voltage is applied to the
capacitors is counted.
Furthermore, the elapsed
time based on the ambient
temperature is corrected.
When 87,600 hours
(10 years) of
operation has been
exceeded
During ordinary
operation
5_06
(Cumulative run
time)
Cooling fans
The cooling fan run time is
counted.
When 87,600 hours
(10 years) of
operation has been
exceeded
During ordinary
operation
5_07
(Cumulative run
time)
IGBT
The IGBT life expectancy is
estimated from changes in
IGBT temperature.
The system
determines that the
life has been reached
when the estimated
IGBT life expectancy
drops below 10% of
the design life.
Normal run time
H83: bit 13 = 1
5_58
(Estimated IGBT
life expectancy)