5.4 Details of Function Codes
5-186
For the factory default of H46, proper values that match to general-purpose motors with different capacities
are set. Basically, there is no need to modify the data.
Depending on the motor characteristics, however, it may take time for residual voltage to disappear (due to
the secondary thermal time constant of the motor). In such a case, the inverter starts the motor with the
residual voltage remaining, which will cause an error in the speed search and may result in occurrence of an
inrush current or an overvoltage alarm.
If it happens, increase the value of H46 data and remove the influence of residual voltage.
(If possible, it is recommended to double the factory default value allowing a margin.)
- Be sure to execute the auto-tune before starting auto search.
- When the estimated speed exceeds the maximum frequency or the upper limit frequency, the
inverter disables auto search and starts running the motor with the maximum frequency or the
upper limit frequency, whichever is lower.
- During auto search, if an overcurrent or overvoltage trip occurs, run the retry operation (re-auto
search operation).
- Perform auto search at 60 Hz or below.
Note that auto search may not fully provide the performance depending on load conditions, moto
parameters, wiring length, and other external factors.
H11
Deceleration Mode
H11 sets the deceleration mode to be applied when a run command is turned off.
Table 5.4-116
Data for H11 Enable
0
Normal deceleration
1
Coast-to-stop (The inverter immediately shuts down its output, so the motor stops
according to the inertia of the motor and machinery (load) and their kinetic energy
losses.)
When reducing the set frequency, the inverter decelerates the motor according to the deceleration
commands even if H11 = 1 (Coast-to-stop) is set.
H12
Instantaneous Overcurrent Limiting (Operation selection) (See F43)
For instantaneous overcurrent limiting (operation selection), see the descriptions of function codes F43 and
F44.
H13, H14
H15, H16
Restart Mode after Momentary Power Failure (Wait Time, Frequency Fall Rate),
Restart Mode after Momentary Power Failure (Continuous Running Level and
Allowable Momentary Power Failure Time) (See F14)
For how to set these function codes (Wait time, Frequency fall rate, Continuous running level and Allowable
momentary power failure time), see the description of function code F14.
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