Fuji Electric FRENIC-Ace series - Page 352

5.3 Description of Function Codes
5-182
■ 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.
■ Pre-excite --EXITE (E01 to E07, data = 32)
Turning this input signal ON starts pre-excitation.
After the delay time for establishing magnetic flux has elapsed, a run command is inputted. Inputting the run
command terminates pre-excitation and starts acceleration.
Use an external sequence to control the time for establishing magnetic flux.
Under V/f control (including auto torque boost and torque vector), pre-excitation is disabled, so use DC
braking or hold the starting frequency instead.
A transient phenomenon, which may occur when the losses of the machinery (load) are small, may make
the motor
rotate during pre-excitation. If the motor rotation during pre-
excitation is not allowed in your
system, install a mechanical brake or other mechanism to stop the motor.
Even if the motor stops due to pre-excitation, voltage is output to inverter’s output terminals [U], [V], and [W].
An electric shock may occur.