5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Current limiter (Operation selection, Operation level)
Related function code: H12 Instantaneous overcurrent limiting (Mode selection)
This is a dedicated V/f control function. It does not work under speed sensorless vector control or vector control
with speed sensor.
When the output current of the inverter exceeds the level specified by the current limiter (F44), the inverter
automatically manages its output frequency to prevent a stall and limits the output current. The value is set to 160%
for the HHD specification, and 130% for the HND specification (initial values are written automatically when HHD
or HND is selected with function code F80). If an overload current of 160% or higher, or 130% or higher flows
momentarily, and the frequency drop resulting from current limiting becomes a problem, consider increasing the
limiting level.
Operation at constant speed only (F43 = 1), and operation when acceleration and at constant speed (F43 = 2) can
be set for the operation selection. Choose F43 = 1 if you need to run the inverter at full capability during acceleration
and to limit the load (current) during constant speed operation.
Mode selection (F43)
F43 selects the motor running state in which the current limiter becomes active.
Running states that enable the current limiter
Braking level (F44)
F44 specifies the operation level at which the output current limiter becomes activated, as a ratio of the inverter
rating.
• Data setting range: 20 to 200 (%) of rated current of the inverter
(Inverter’s rated current changes according to the setting value of function code F80.)
Instantaneous overcurrent limiting (Mode selection) (H12)
H12 specifies whether the inverter invokes the current limit processing or enters the overcurrent trip when its output
current exceeds the instantaneous overcurrent limiting level. Under the current limit processing, the inverter
immediately turns OFF its output gate to suppress the further current increase and continues to control the output
frequency.
Disable (An overcurrent trip occurs at the instantaneous overcurrent limiting level.)
Enable (An instantaneous overcurrent limiting operation is activated.)
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