Fuji Electric FRENIC-Ace series - At Shipment; Shipment

7.4 List of Periodic Replacement Parts
7-7
MAINTENANCE AND INSPECTION
Chap 7
When the inverter uses an auxiliary control power input, the load conditions widely differ so that the
discharging time cannot be accurately measured. In this case, measuring of the discharging time can be
disabled with the function code H98 (Bit 4 = 0) for preventing unintended measuring.
ON-time counting of DC link bus capacitor
• In a machine system where the inverter main power is rarely shut down, the inverter does not measure the
discharging time. For this case, the ON-time counting is provided. The ON-time counting result can be
represented as “elapsed time” (
5_26 ) and “time remaining before the end of life” ( 5_27 ) as shown in the “DC
link bus capacitor” section in Table 7.4-2.
[ 1 ] Measuring the capacitance of DC link bus capacitor in comparison with initial one
at shipment
The measuring procedure given below measures the capacitance of DC link bus capacitor in comparison with initial
one at shipment when the power is turned OFF. The measuring result can be displayed on the keypad as a ratio
(%) to the initial capacitance.
------------------------------------------------ Capacitance measuring procedure ---------------------------------------------------
1) To ensure validity in the comparative measurement, put the condition of the inverter back to the state at factory
shipment.
• Remove the option card (if already in use) from the inverter.
• In case another inverter is connected via the DC link bus to the P(+) and N(-) terminals of the main circuit,
disconnect the wires. It is not required to disconnect the DC reactor (optional), if any.
• Disconnect power wires for the auxiliary input to the control circuit (R0, T0).
• Mount the keypad.
• Turn OFF all the digital input signals fed to terminals [FWD], [REV], and [X1] through [X5] of the control
circuit.
• If an external speed command potentiometer is connected to terminal [13], disconnect it.
• If an external apparatus is attached to terminal [PLC], disconnect it.
• Ensure that transistor outputs [Y1] and [Y2] and Relay output terminals [30A/B/C] will not be turned ON.
• Disable the RS-485 communications link and CANopen 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.
2) Turn ON the main circuit power.
3) Confirm that the DC cooling fan is rotating and the inverter is in stopped state. Disable the cooling fan ON/OFF
control (H06 = 0).
4) Shut down the main circuit power.
5) The inverter automatically starts the measurement of the capacitance of the DC link bus capacitor.
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 (
5_05 ).
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