Judgment On Service Life - Fuji Electric FRENIC-HVAC User Manual

10.3.1

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 LCD 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 life time alarm command LIFE
is assigned to any of the digital output terminals. (Refer to "[ 3 ] Early warning of lifetime alarm" later
in this section.)
Table 10.3 lists the parts whose service life can be predicted and details the life prediction function.
The predicted values should be used only as a guide since the actual service life is influenced by the
ambient temperature and other usage environments.
Object of life
Prediction function
prediction
DC link bus Measurement of
capacitor discharging time
Measures the
discharging time of the
DC link bus capacitor
when the main power
is shut down and
calculates the
capacitance.
ON-time counting
Counts the time elapsed
when the voltage is
applied to the DC link
bus capacitor, while
correcting it according
to the capacitance
measured above.
Electrolytic Counts the time elapsed
capacitors on when the voltage is
printed applied to the
circuit capacitors, while
boards correcting it according
to the ambient
temperature.
Cooling fan Counts the run time of
the cooling fan.
Table 10.3 Life Prediction
End-of-life criteria
85% or lower of the initial
capacitance at shipment
(See "[ 1 ] Measuring the
capacitance of the DC link
bus capacitor in comparison
with initial one at shipment"
on the next page.)
85% or lower of the
reference capacitance
under ordinary operating
conditions at the user site
(See "[ 2 ] Measuring the
capacitance of the DC link
bus capacitor under ordinary
operating conditions" on
page 10-6.)
Exceeding 43,500 hours
(5 years)
For 230 V class series
inverters of 75 HP or
above, 460 V ones of 150
HP or above and 575V
ones of 200HP or above:
Exceeding 87,000 hours
(10 years)
Exceeding 43,500 hours
(5 years)
For 230 V class series
inverters of 75 HP or
above, 460 V ones of 150
HP or above and 575V
ones of 200HP or above:
Exceeding 87,000 hours
(10 years)
Exceeding 43,500 hours
(5 years)
For 230 V class series
inverters of 75 HP or
above, 460 V ones of 150
HP or above and 575V
ones of 200HP or above:
Exceeding 87,000 hours
(10 years)
10-4
Prediction
On the LCD monitor
timing
At periodic 3. INV Info
inspection >4. Maintenance
>Main Capacitor
(H98: Bit 3 = 0)
Cap (Capacitance)
During ordinary
operation
(H98: Bit 3 = 1)
During ordinary 3. INV Info
operation >4. Maintenance
>Main Capacitor
EneT (Elapsed time)
RemT
(Time remaining before
the end of life)
During ordinary 3. INV Info
operation >4. Maintenance
>PCB Capacitor
EneT
(Cumulative run time)
Life
(Lifetime estimated)
During ordinary 3. INV Info
operation >4. Maintenance
>Cooling Fan
EneT
(Cumulative run time)
Life
(Lifetime estimated)