9.2 Details of Function Codes
9-105
Chap. 9 FUNCTION CODES
H97 Clear Alarm Data H45 (Mock Alarm)
H97 clears all alarm data (alarm history and relevant information) of alarms that have
occurred in running of the inverter and mock alarms that have been caused by H45 at the time
of machine setup, both of which are saved in the inverter memory.
Setting the H97 data to "1" clears the saved alarm data. (Accessing the H97 data requires
simultaneous keying of "
key + key.") After that, the H97 data automatically reverts to
"0."
H98 Protection/Maintenance Function (Mode selection)
H98 specifies whether to enable or disable (a) automatic lowering of carrier frequency, (b)
input phase loss protection, (c) output phase loss protection, and (d) judgment on the life of
the DC link bus capacitor, as well as specifying the judgment threshold on the life of the DC
link bus capacitor, in a combination of Bit 0 to Bit 4.
Automatic lowering of carrier frequency (Bit 0)
This function should be used for important machinery that requires keeping the inverter
running.
Even if a heat sink overheat or overload occurs due to excessive load, abnormal ambient
temperature, or cooling system failure, enabling this function lowers the carrier frequency to
avoid tripping (
0h1
, or
0luv
). Note that enabling this function results in increased motor
noise.
When the output circuit filter OFL--2 or -4 is connected, be sure to set this bi
to "0" to disable the automatic carrier frequency lowering function.
Input phase loss protection (
lin
) (Bit 1)
Upon detection of an excessive stress inflicted on the apparatus connected to the main circuit
due to phase loss or line-to-line voltage unbalance in the three-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,
phase loss or line-to-line voltage unbalance may not be detected because of the
relatively small stress on the apparatus connected to the main circuit.
Output phase loss protection (
0pl
) (Bit 2)
Upon detection of 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.
Judgment threshold on the life of DC link bus capacitor (Bit 3)
Bit 3 is used to select the threshold for judging the life of the DC link bus capacitor between
factory default setting and your own choice.
Before specifying the threshold of your own choice, measure and confirm the
reference level in advance.
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