8-3
*
Estimation of life expectancy based on maintenance information
The maintenance information is stored in the inverter KEYPAD panel and indicates the electrostatic
capacitance of the main circuit capacitors and the life expectancy of the electrolytic capacitors on the control
PC board and of the cooling fans. Use this data as the basis to estimate the life expectancy of parts.
1) Determination of the capacitance of the main circuit capacitors
This inverter is equipped with a function to automatically indicate the capacitance of the capacitors
installed in the main circuit when powering up the inverter again after disconnecting the power according
to the prescribed conditions.
The initial capacitance values are set in the inverter when shipped from the factory, and the decrease
ratio (%) to those values can be displayed.
Use this function as follows:
(1) Remove any optional cards from the inverter. Also disconnect the DC bus connections to the main circuit
P(+) and N(
-
) terminals from the braking unit or other inverters if connected. The existing power-factor
correcting reactor (DC reactor) need not be disconnected.
A power supply introduced to the auxiliary input terminals (R0, T0) that provides control power should be
isolated.
(2) Disable all the digital inputs (FWD, REV, X1-X9) on the control terminals. Also disconnect RS485
communication if used.
Turn on the main power supply. Confirm that the cooling fan is rotating and that the inverter is not
operating. (There is no problem if the "OH2 External thermal relay tripped" trip function is activated due to
the digital input terminal setting off.)
(3) Turn the main power off.
(4) Turn on the main power again after verifying that the charge lamp is completely off.
(5) Open the maintenance information on the KEYPAD panel and confirm the capacitance values of the built-
in capacitors.
2) Life expectancy of the control PC board
The actual capacitance of a capacitor is not measured in this case. However, the integrated operating
hours of the control power supply multiplied by the life expectancy coefficient defined by the temperature
inside the inverter will be displayed. Hence, the hours displayed may not agree with the actual operating
hours depending on the operational environment.
Since the integrated hours are counted by unit hours, power input for less than one hour will be
disregarded.
3) Life expectancy of cooling fan
The integrated operating hours of the cooling fan are displayed. Since the integrated hours are counted
by unit hours, power input for less than one hour will be disregarded.
The displayed value should be considered as a rough estimate because the actual life of a cooling fan is
influenced significantly by the temperature.
Table 8-2-2 Rough estimate of life expectancy using maintenance information
Parts
Level of judgment
Capacitor in main circuit
85% or less of the initial value
Electrolytic capacitor on
control PC board
61,000hours
Cooling fan
25,000hours (*1)
*1 Estimated life expectancy of a ventilation-fan at inverter ambient temperature of 40
°
C
Summary of Contents for 5000VG7S Series
Page 7: ...0 6 Warning Label Position for Inside the Inverter...
Page 23: ...2 5 Basic Wiring Diagram Figure 2 3 1 Basic Wiring Diagram...
Page 36: ...2 18 l Control circuit terminals Control circuit terminals Screw size M3...
Page 94: ...9 4 FS5941 40 47 Figure 9 1 FS5941 60 52 FS5941 86 52 Figure 9 2...
Page 96: ...9 6 RF3280 F11 RF3400 F11 Figure 9 5 RF3880 F11 Figure 9 6 6 6 Figure 9 7 F200160...
