5.4 Details of Function Codes
5-194
- The capacitance measuring conditions at shipment are limited for stabilization of the load only. Therefore,
actual operating conditions are usually different, and measurement of discharge time is not automatically
executed at the time of power shut-off. In this case, execute the measurement in the periodical inspection
by applying the capacitance measurement condition of the capacitor at the shipment. See "[1] Method to
compare the default value and current value of the capacitance of the main circuit capacitor" given below.
- To measure the capacitance of the main circuit capacitor under ordinary operating conditions when the
power is turned off, it is necessary to set up the load conditions at the power down and measure the
capacitance (initial setting) when the inverter is introduced. See "[2] Measuring method of the capacitance
of the main circuit capacitor at the power shut-down under standard operating status" on the next page.
However, when the setting is executed as shown above, setting bit = 3 for H98 can return the setting that
is to compare with the capacity of the capacitor at the factory default value.
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 by setting bit4 = 0 in the function code H98 in order to
prevent unintended measuring. (For details, see H98.)
ON-time Counting of Main Circuit Capacitor
- In a machine system where the inverter main power is rarely shut down, the inverter does not measure
the discharging time. Therefore, the function that judges service life by counting the time, when the
voltage is applied to the main circuit capacitor (main power on time), is also operated. If the capacitance
measurement of the main circuit capacitor is executed, elapsed time is calculated by the capacitance
deceasing rate, and the main power on time is corrected. Two indication types are provided, which are
"elapsed time" and "remaining time before the end of service life."
[1] Method to compare the default value and current value of the capacitance of the main circuit capacitor
When bit 3 of H98 data is 0, the measuring procedure given below measures the capacitance of main circuit
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 from the inverter, if the card is used.
- In case another inverter is connected via the DC link bus to the P(+) and N(-) terminals of the main
circuit, disconnect the wires. You do not need to disconnect a DC reactor (optional), if any.
- Disconnect power wires for the auxiliary input to the control power circuit (R0, T0).
- In case the standard keypad has been replaced with an optional multi-function keypad after the
purchase, put back the original standard keypad.
- Turn off all the digital input signals ([FWD], [REV], and [X1] through [X9]) of the control circuit.
- If a potentiometer is connected to terminal [13], disconnect it.
- If an external apparatus is attached to terminal [PLC], disconnect it.
- Ensure that transistor output signals ([Y1] to [Y4]) and relay output signals ([Y5A/C], [30A/B/C]) will
not be turned ON.
- Disable the RS-485 communications link of the inverter.
If negative logic is specified for the transistor output and relay output signals, they are
considered ON when the inverter is not running. In that case, change the settings.
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