7.4 List of Periodic Replacement Parts
7-11
MAINTENANCE AND INSPECTION
[ 2 ] Measuring the capacitance of the DC link bus capacitor under ordinary operating
conditions
The inverter automatically measures the capacitance of the DC link bus capacitor under ordinary operating
conditions when the power is turned OFF. This measurement requires setting up the load conditions for ordinary
operation and measuring the reference capacitance when the inverter is introduced to the practical operation,
using the setup procedure given below.
Perform measurement immediately after purchasing the inverter (after trial run), or immediately after replacing the
DC link bus capacitor.
--------------------------------------------- Reference capacitance setup procedure -----------------------------------------------
1) Set bit 3 of function code H98 at “1” (User mode) to enable the user to specify the judgment criteria for the
service life of the DC link bus capacitor.
2) Turn OFF all run commands.
3) Make the inverter ready to be turned OFF under ordinary operating conditions.
4) Set both function codes H42 (Capacitance of DC link bus capacitor) and H47 (Initial capacitance of DC link
bus capacitor) to “0 ”.
5) Turn OFF the inverter, and the following operations are automatically performed.
The inverter measures the discharging time of the DC link bus capacitor and saves the result in function code
H47 (Initial capacitance of DC link bus capacitor).
DC link bus capacitor measurement conditions (terminal [X1 to X9], [Y1 to Y5] ON/OFF status, whether
inverter equipped with option card or keypad) are automatically detected and saved.
During measurement, “ . . . . . ” appears on the LED monitor.
6) Turn ON the inverter again.
Ensure that function code H42 (capacitance of DC link bus capacitor) and H47 (initial capacitance of DC link
bus capacitor) values are appropriate.
Shift to Menu #5 “Maintenance Information” and ensure that the electrostatic capacity ratio (%) of the DC link
bus capacitor is 100%.
If the measurement has failed, “1 ” is entered into both H42 and H47. Remove the factor of the failure
and conduct the measurement again.
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Hereafter, each time the inverter is turned OFF, the DC link bus capacitor discharge time is automatically measured
if the above conditions are met. Periodically check the electrostatic capacity ratio (%) of the DC link bus capacitor
with Menu #5 “Maintenance Information” in Programming mode.
The condition given above tends to produce a rather large measurement error. If this mode gives you a
lifetime alarm, revert bit 3 of H98 (Main circuit capacitor life judgment selection) to the default setting (bit
3 = 0) and conduct the measurement under the condition at the time of factory shipment.
[ 3 ] Early warning of lifetime alarm
For the components listed in Table 7.4-2, the inverter can issue an early warning of lifetime alarm LIFE at one of
the transistor output terminals [Y1] to [Y4] and relay output terminals [Y5 A/C] and [30 A/B/C] as soon as any one of
the levels specified in Table 7.4-2 has been exceeded. If even one of the service life-limited parts exceeds the
criteria, an ON signal is output.
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