HP Anab EQ5 - Manual (Page 105)

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TECO – Westinghouse Motor Company Caps, Control Board & Cooling Fan Life Expectancy 99
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 in
the main DC circuit when powering up the drive 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 the procedure as next described.
(a) Remove any option 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) does not need to be disconnected.
A power supply connected to the auxiliary input terminals (R0, T0) that provides control power should be
isolated.
(b) Disable all the digital inputs (FWD, REV, X1-X9) on the control terminals. Also disconnect RS485
serial 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 terminals being disabled.)
(c) Turn the main power off.
(d) Turn on the main power again after verifying that the charge lamp is completely off.
(e) Open the maintenance information on the digital operator and confirm the capacitance values of the
capacitors.
2) Life expectancy of the control PC board.
The actual capacitance of a capacitors 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 7-2-2 Estimate of Life Expectancy Using Maintenance Information
Parts Level of Judgment
Capacitor in main DC circuit 85% or less of the initial value
Electrolytic capacitor on
control PC board
61,000 hours
Cooling fan
40,000 hours (5HP or less), 25,000 hours (Over 7.5HP/CT,
10HP/CT) (*1)
*1 Estimated life expectancy of the cooling fan at inverter ambient temperature of 40°C (104°F)