Fuji Electric FRENIC-Ace series, User Manual

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7.4 List of Periodic Replacement Parts
7-8
[ 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
--------------------------------------------- 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 each of function codes H42 (Capacitance of DC link bus capacitor) and H47 (Initial capacitance of DC link
bus capacitor) at “
0000
.”
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).
The conditions under which the measurement has been conducted will be automatically collected and saved.
6) Turn ON the inverter again.
Confirm that H47 (Initial capacitance of DC link bus capacitor) holds right values. Switch to Menu #5
“Maintenance Information” in Programming mode and confirm that the main capacitor capacity is 100% (
5_05
= 100%).
If the measurement has failed, “
0001 ” is entered into each of H42 and H47. Remove the cause of the
failure and conduct the measurement again.
------------------------------------------------------------------------------------------------------------------------------------------------------
Hereafter, each time the inverter is turned OFF, it automatically measures the discharging time of the DC link bus
capacitor if the above conditions are met. Periodically check the capacitance (%) of the DC link bus capacitor
(
5_05
) with Menu #5 “Maintenance Information” in Programming mode.
The condition given above produces 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] and [Y2] and Relay output terminals [30A/B/C] as soon as any one of the levels
specified in Table 7.4-2 has been exceeded.
The early warning signal is also turned ON when a lock condition on the internal air circulation DC fan (provided on
FRN0203E2 ■ -4

or above) has been detected.