5.4 Details of Function Codes
5-208
H97
Alarm Data Clear Related Function Code: H45 Mock Alarm
H97 clears alarm data (alarm history and relevant information) of the alarm output during machinery
adjustment and returns to the status, where the alarm is not occurring.
To clear alarm data, simultaneous keying of "
key + key" is required.
Table 5.4-143
Data for H97 Function
0
Disable
1
Clear (Setting "1" clears alarm data and then returns to "0.")
H98
Protection/Maintenance Function (Operation Selection)
H98 sets whether to enable or disable automatic lowering of carrier frequency, input phase loss protection,
output phase loss protection, judgment criteria of service life of main circuit capacitor, judgment on the life of
main circuit capacitor, DC fan lock detection, braking transistor error detection, and IP20/IP40 switching, in
combination.
Carrier frequency automatic lowering function (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 surrounding temperature, or cooling
system failure, enabling this function lowers the carrier frequency to avoid tripping (
0h1
,
0h3
or
0lu
). Note
that enabling this function results in increased motor noise.
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 protection 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 o
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
: Output Phase Loss) (Bit 2)
Upon detection of output phase loss 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 criteria on the service life of main circuit capacitor (Bit 3)
Bit 3 is used to select the threshold for judging the life of the main circuit capacitor between the factory
default setting and a user-defined setting.
Before specifying a user-defined threshold, measure and confirm the reference level in advance.
(
Function code H42)
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