Capacitance of DC link bus capacitor, Cumulative run time of cooling fan
Cumulative run time of capacitors on printed circuit boards
Related function codes: H47 Initial capacitance of DC link bus capacitor
H98 Protection/maintenance function
■ Life prediction function
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 life prediction function can also issue
early warning signals if the lifetime alarm command LIFE is assigned to any of the digital output terminals by any of
E20, E21 and E27.
The predicted values should be used only as a guide since the actual service life is influenced by the surrounding
temperature and other usage environments.
Object of life
prediction
Prediction function End-of-life criteria Prediction timing
On the LED
monitor
DC link bus
capacitor
Calculating the capacitance of
DC link bus capacitor
Measures the discharging time
of the DC link bus capacitor
when the main power is shut
down and calculates the
capacitance.
85% or lower of the initial
capacitance at shipment
(See “[ 1 ] Measuring the
capacitance of DC link bus
capacitor in comparison
with initial one at
shipment” on page 5-171.)
At periodic
inspection
H98 bit3 = 0
5_05
(Capacitance)
85% or lower of the
reference capacitance
under ordinary operating
conditions at the user site
(See “[ 2 ] Measuring the
capacitance of DC link bus
capacitor under ordinary
operating conditions at
power shutdown” on page
5-172.)
During ordinary
operation
H98 bit3 = 1
5_05
(Capacitance)
ON-time counting of DC link bus
capacitor
Counts the time elapsed when
the voltage is applied to the DC
link bus capacitor, while
correcting it according to the
capacitance measured above.
Exceeding 87,600 hours
(10 years)
(ND mode: 61,320 hours
(7 years))
During ordinary
operation
5_26
(Elapsed time)
5_27
(Remaining
hours)
Electrolytic
capacitors on
printed circuit
boards
Counts the time elapsed when
the voltage is applied to the
capacitors, while correcting it
according to the surrounding
temperature.
Exceeding 87,600 hours
(10 years)
(ND mode: 61,320 hours
(7 years))
During ordinary
operation
5_06
(Cumulative
run time)
Cooling fans Counts the run time of the
cooling fans.
Exceeding 87,600 hours
(10 years)
(ND mode: 61,320 hours
(7 years))
During ordinary
operation
5_07
(Cumulative
run time)
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