5.3 Description of Function Codes 5.3.5 H codes (High performance functions)
Auto-reset (Times and reset interval)
H04 and H05 specify the auto-reset function that makes the inverter automatically attempt to reset the tripped state
and restart without issuing an alarm output (for any alarm) even if any protective function subject to reset is activated
and the inverter enters the forced-to-stop state (tripped state). If the protective function is activated in excess of the
times specified by H04, the inverter will issue an alarm output (for any alarm) and not attempt to auto-reset the
tripped state.
Listed below are the protective functions subject to auto-reset.
Breaking resistor
overheat
Inverter internal overheat
Step-out/magnetic pole
position detection failure
Charging resistor
overheat
Number of reset times (H04)
H04 specifies the number of reset times for the inverter to automatically attempt to escape the tripped state. When
H04 = 0, the auto-reset function will not be activated.
• Data setting range: 0 (Disable), 1 to 20 (times)
If the inverter stops due to a trip by selecting the retry function, it may automatically restart, and the motor may
rotate depending on the cause of the trip. Design machines in such a way as to ensure the safety of the human
body and surrounding area even when operation is resumed.
Failure to observe this could result in an accident.
Reset interval (H05)
• Data setting range: 0.5 to 20.0 (s)
H05 specifies the reset interval time between the time when the inverter enters the tripped state and the time when
it issues the reset command to attempt to auto-reset the state. Refer to “Operation timing scheme” below.
<Operation timing scheme>
• In the figure below, normal operation restarts in the 4-th retry.
Tripped state reset
command
Inverter output
frequency
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