Fuji Electric FRENIC-HVAC User Manual page 676

• Ensure that transistor output signals ([Y1] to [Y4]) and relay output signals ([Y5A/C] and
[30A/B/C]) will not be turned ON.
• Disable the RS-485 communications link.
If negative logic is specified for the transistor output and relay output signals, they are
considered ON when the inverter is not running. Specify positive logic for them.
• Keep the ambient temperature within 25 ±10°C (77 ±18°F).
2) Turn ON the main circuit power.
3) Confirm that the cooling fan is rotating and the inverter is in stopped state.
4) Turn OFF the main circuit power.
5) The inverter automatically starts the measurement of the capacitance of the DC link bus capacitor.
Make sure that the LCD monitor shows the measuring status ("Before measurement" →
"Measurement in progress" → "Measurement completed").
If no measuring status indication appears on the LCD monitor, measurement has not
started. Check the conditions listed in 1).
6) After the measuring status indication has disappeared from the LCD monitor, turn ON the main
circuit power again.
7) Switch to Programming mode, PRG > 3(INV Info) > 4(Maintenance) and note the reading (relative
capacitance (%) of the DC link bus capacitor). Refer to Chapter 5, Section 5.6.4.4 "Maintenance
Information."
------------------------------------------------------------------------------------------------------------------------
[ 2 ] Measuring the capacitance of the DC link bus capacitor under
ordinary operating conditions
When bit 3 of H98 data is 1, 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 function code H98 (Protection/maintenance function) to allow the user to specify the judgment
criteria for the service life of the DC link bus capacitor (Bit 3 = 1).
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 "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 H42 (Capacitance of DC link bus capacitor) and H47 (Initial capacitance of DC link
bus capacitor) hold right values. Switch to Programming mode, PRG > 3(INV Info) >
4(Maintenance) and confirm that the relative capacitance (ratio to full capacitance) is 100%.
If the measurement has failed, "0001" is entered into both H42 and H47. Remove the
factor of the failure and conduct the measurement again.
-------------------------------------------------------------------------------------------------------------------------
10-6