P0.27
Serial communication
protocol
Setting Range：0～0 0
DGI900 supports 0：MODBUS.
6.2 Start/Stop Control（Group P1）
P1.00 Start mode Setting Range：0～2 0
0：Direct start
– If the DC braking time is set to 0, the AC drive starts to run at the startup frequency.
– If the DC braking time is not 0, the AC drive performs DC braking first and then starts to
run at the startup frequency. It is applicable to small-inertia load application where the motor
is likely to rotate at startup.
1：Rotational speed tracking restart
The AC drive judges the rotational speed and direction of the motor first and then starts at
the tracked frequency. Such smooth start has no impact on the rotating motor. It is
applicable to the restart upon instantaneous power failure of large-inertia load. To ensure
the performance of rotational speed tracking restart, set the motor parameters in group
P1.11~ P1.12 correctly.
2：Pre-excited start
It is valid only for asynchronous motor and used for building the magnetic field before the
motor runs. For pre-excited current and pre-excited time, see parameters of P1.03 and
P1.04.
– If the pre-excited time is 0, the AC drive cancels pre-excitation and starts to run at startup
frequency.
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