Fuji Electric FRENIC-MEGA, Instruction Manual

Page: 328 / 358

7-3
7.3 List of Periodic Replacement Parts
Each part of the inverter has its own service life that will vary according to the environmental and operating conditions. It is
recommended that the following parts be replaced at the specified intervals.
When the replacement is necessary, consult your Fuji Electric representative.
Table 7.2 Replacement Parts
Part name Standard replacement intervals (See Note below.)
DC link bus capacitor 10 years
Electrolytic capacitors on printed circuit boards 10 years
Cooling fans 10 years
Fuse 10 years (for inverters of 150 HP or above)
(Note) These replacement intervals are based on the inverter's service life estimated at a surrounding temperature of 40
°
C (104
°
F)
at 80% (LD/MD-mode inverters) or 100% (HD-mode inverters) of full load. In environments with a surrounding
temperature above 40
°
C (104
°
F) or a large amount of dust or dirt, the replacement intervals may be shorter.
Standard replacement intervals mentioned above are only a guide for replacement, not a guaranteed service life.
7.3.1 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 7.3 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 surrounding temperature and other usage environments.
Table 7.3 Life Prediction
Object of life
prediction
Prediction function End-of-life criteria Prediction timing On the LCD monitor
DC link bus
capacitor Measurement of discharging
time
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 the next page.)
At periodic
inspection
(H98: Bit 3 = 0)
Menu #5
"5: MAINTENANC"
↓
Page 2, "CAP"
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"
on page 7-5.)
During ordinary
operation
(H98: Bit 3 = 1)
Menu #5
"5: MAINTENANC"
↓
Page 2, "CAP"
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. Exceeding 87,600 hours
(10 years) During ordinary
operation Menu #5
"5: MAINTENANC"
↓
Page 8, "CAPEH" and
"CAPRH"
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) During ordinary
operation Menu #5
"5: MAINTENANC"
↓
Page 3, "TCAP"
Cooling fans Counts the run time of the
cooling fans. Exceeding 87,600 hours
(10 years) During ordinary
operation Menu #5
"5: MAINTENANC"
↓
Page 3, "TFAN"