7-4
g In a machine system where the inverter main power is rarely shut down, the inverter does not measure the discharging time.
For such an inverter, 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 Table 7.3, "On the LED monitor."
When the inverter uses an auxiliary control power input, the load conditions widely differ so that the discharging time
cannot be accurately measured. To prevent unintended measuring, the discharging time measurement can be disa
led
with the function code H98 (Bit 4 = 0).
[ 1 ] Measuring the capacitance of DC link bus capacitor in comparison with initial one at shipment
When bit 3 of H98 data is 0, 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. (You do not need to disconnect a DC reactor (optional), if any.)
• Disconnect power wires for the auxiliary input to the control circuit (R0, T0).
• Mount the remote keypad on the inverter.
• Turn OFF all the digital input signals fed to terminals [FWD], [REV], and [X1] through [X7] of the control circuit.
• If an external frequency command 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] - [Y5C], and [30A/B/C]) will not be
turned ON.
• Disable the RS-485 communications link.
It is recommended that terminal [EN] be short-circuited for the measurement of the capacitance.
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 surrounding temperature within 25 ±10°C.
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 " . . . . "
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 note the reading (relative capacitance (%) of the DC
link bus capacitor).
-------------------------------------------------------------------------------------------------------------------------------------------------------
What keypad type is
mounted on the inverter?
(See f.)
Modify the measuring
conditions applied at
shipment?
Comparison with the initial
capacitance at shipment
(See [1].)
Measurement under
ordinary operating
conditions when the power
is turned OFF (See [2].)
Remote keypad
Multi-function ke
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