5-114
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
H84, H85 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) Data setting range: 100 to 400 (%) (Ratio to the motor's no-load current)
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.
Pre-excitation (Time) (H85) Data setting range: 0.00 (Disable), 0.01 to 30.00 (s)
H85 specifies the pre-excitation time before starting operation. 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-excitation--EXITE (E01 to E07, data = 32)
When this input signal comes ON, pre-excitation starts. After the delay time for establishing magnetic flux has elapsed,
a run command is inputted. When the run command is inputted, the pre-excitation ends and acceleration starts. Use an
external sequence to control the time for establishing magnetic flux.
In V/f control (including auto torque boost and torque vector), pre-excitation is disabled. Use the DC braking
or the starting frequency instead.
A transient phenomenon, which may occur when the amount of mechanical loss is small, may rotate the moto
during pre-excitation. If a 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 is stopped by pre-excitation, voltage is output to inverter's output terminals U, V, and W.
An electric shock may occur.
H86 to H90 Reserved for particular manufacturers
H86 to H90 are reserved for particular manufacturers. Do not modify the settings.
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