7.3 List of Periodic Replacement Parts
7-6
• If a potentiometer is connected to terminal [13], disconnect it.
• If an external apparatus is attached to terminal [PLC], disconnect it.
• Ensure that transistor outputs [Y1] through [Y4] and relay output terminals [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.
• The surrounding temperature should be 25°C±10°C.
2) Turn ON the main circuit power.
3) Confirm that the DC cooling fan is rotating and the inverter is in stopped state.
4) Shut down the main circuit power.
5) The inverter automatically starts the measurement of the capacitance of the DC link bus capacitor.
Check that " . . . . " appears on the LED monitor.
If " . . . . " does not appear on the LED monitor, the measurement has not started. Check the
conditions listed in 1).
6) After " . . . . " has disappeared from the LED monitor, turn ON the main circuit power again.
7) Select Menu #5 "Maintenance Information" in Programming mode and check the capacitance (%) of
the DC link bus capacitor.
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(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.
---------------------------------------------- Capacitance measuring 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.
During measurement, " . . . . " appears on the LED monitor.
6) Turn ON the inverter again.
Confirm that H42 (Capacitance of DC Link Bus Capacitor) and 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%.
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