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H94 Cumulative Run Time of Motor
You can view the cumulative run time of the motor on the keypad. This feature is useful for
management and maintenance of the mechanical system. With this function code (H94), you can
set the cumulative run time of the motor to any value you choose. For example, by specifying "0,"
you can clear the cumulative run time of the motor.
The data for H94 is in hexadecimal notation. Check the cumulative run time of the
motor on the keypad.
H97 Clear Alarm Data
H97 deletes the information such as alarm history and data at the time of alarm occurrence,
including alarms that have occurred during the check-up or adjustment of the machinery. Data is
then brought back to a normal state without an alarm.
Deleting the alarm information requires simultaneous keying of
and keys.
Data for H97 Function
0
Disable
1
Clear all
(This data clears all alarm data stored and returns to "0.")
H98 Protection/Maintenance Function
H98 specifies whether to enable or disable (a) automatic lowering of the carrier frequency, (b)
protection against input phase loss, (c) protection against output phase loss, and (d) judgment on
the DC link bus capacitor life, and the change of judgment criteria on the DC link bus capacitor life
and the selection of handling on DC fan lock detection, in a style of combination.
Automatic lowering function of carrier frequency
You have to prevent important machinery from stopping as much as possible. Even if the inverter
is in heat sink overheating or overload state because of excessive load, abnormal ambient
temperature, or a trouble in the cooling system, with this function enabled, the inverter lowers the
carrier frequency to avoid tripping (
0h1
,
0h3
or
0lu
). Note that if this feature is enabled the
motor noise increases.
Protection against input phase loss (
lin
)
Upon detecting an excessive stress inflicted on the apparatus connected to the main circuit
because of phase loss or inter-phase imbalance in the 3-phase power supplied to the inverter,
this feature stops the inverter and displays an alarm
lin
.
In configurations where only a light load is driven or a DC reactor is connected, a phase
loss or an inter-phase imbalance may not be detected because of the relatively small
stress on the apparatus connected to the main circuit.
Protection against output phase loss (
0pl
: Output Phase Loss)
Upon detecting a phase loss in the output while the inverter is running, this feature stops the
inverter and displays an alarm
0pl
. Where a magnetic contactor is installed in the inverter output
circuit, if the magnetic contactor goes OFF during operation, all the phases will be lost. In such a
case, this protection feature does not work.
Selection of life judgment criteria of the DC link bus capacitors
Allows you to select the criteria for judging the life of the DC link bus capacitor/s (reservoir
capacitor/s) between factory default setting and your own choice.
Before specifying the criteria of your own choice, measure and confirm the reference
level in advance. For details, refer to Chapter 7 "MAINTENANCE AND INSPECTION."
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