5.3 Description of Function Codes 5.3.5 H codes (High performance functions)
Pre-excitation (Initial level, Time)
A motor generates torque with magnetic flux and torque current. Lag elements of the rising edge of magnetic flux
causes a phenomenon in which enough torque is not generated at the moment of the motor start. To obtain enough
torque even at the moment of motor start, enable the pre-excitation with H84 and H85 so that magnetic flux is
established before a motor start.
Pre-excitation (Initial level) (H84)
H84 specifies the forcing function for the pre-excitation. It is used to shorten the pre-excitation time.
Basically, there is no need to modify the default setting.
• Data setting range: 100 to 400 (%) (exciting current level in percentage)
Pre-excitation (Time) (H85)
H85 specifies the pre-excitation time before starting operation.
• Data setting range: 0.00 (Disable), 0.01 to 30.00 (s)
When a run command is inputted, the pre-excitation starts.
After the pre-excitation time specified by H85 has elapsed, the inverter judges magnetic flux to have been
established and starts acceleration. Specify H85 data so that enough time is secured for establishing magnetic flux.
The appropriate value for H85 data depends on the motor capacity. Use the default setting value of H13 data as a
guide.
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