IMO VXSM75-1 Instruction Manual page 80

• Judgment of life using maintenance data
The maintenance data of function codes H42
and H43 can be used to display data for the
judgment of the capacitance of the capacitor in
the main circuit and the life of the cooling fan to
obtain a measure for the judgment of parts
replacement. The capacitor life forecast signal is
issued at the Y1 and Y2 terminals according to
the measured capacitance after the capacitance
of the capacity reaches 85%.
(1)Measurement of capacitance of capacitor in
main circuit
This inverter is provided with a function
where the capacitance of the main circuit
capacitor is automatically measured upon
shutoff of the inverter under certain
conditions and it is displayed on the keypad
panel upon power-up.
The capacitance of the capacitor is displayed
in the reduction ratio (% display) of the initial
value stored inside the inverter before
shipment.
Procedure of measurement of capacitor
capacitance
1. Remove the optional card from the
inverter if it is mounted. Disconnect the
braking unit or direct current bus to
another inverter from the P (+) and N (-)
terminals of the main circuit if there is
any. The power factor improving reactor
(DC reactor) may not be disconnected.
2. Turn the digital inputs (FWD, REV, X1-
X5) at the control
Disconnect the RS 485 communication
terminal if it is connected.
3. Turn the main power supply on. Check
that the cooling fan rotates. Check that
the inverter is stopped. (The "OH2
external alarm" caused by deactivated
digital input terminals does not cause a
problem.)
4. Turn the main power supply off.
5. After the charge lamp is unlit completely,
turn the main power supply on again.
6. Monitor function code H42 to check the
capacitor capacitance (%).
Maintenance and Inspection
(2)Life of cooling fan
Part
Main circuit
capacitor
Cooling fan
*1: Assumed life of cooling fan at ambient
inverter temperature of 40 degree C.
Table 8-2-2 Measure for judgment of life based on
maintenance data
terminals off.
Function code H43 indicates the total
operation time of the cooling fan. The time is
integrated in units of an hour and fractions
shorter than an hour are ignored.
The actual life of the fan is largely effected by
the temperature. Take the time as a
measure.
Judgment level
85% or lower of the initial
value
30,000 hours (4.0 kW or
less), 25,000 hours (5.5 kW
or more) *1
8-3