Soft Stop Mode; Free Stop Mode - Janson Controls SFT30 Series User Manual

SFT30 Soft Starter User Manual
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In this start mode, output voltage waveform will be based on the motor and
load conditions vary.

12.6 Soft Stop Mode

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SFT30 series soft starters, there are two stop modes, soft-stop mode and

free stop mode.

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When do not set F2 to zero, it is for soft stop mode. Chart12-6-1shows the
soft stop mode output current waveform, set code F2 as the soft stop time T.
In this stop mode, the motor power start from the bypass contactor and
switch to the output of soft starter thyristor, soft starter output voltage
decrease steadily from the total pressure, reducing the motor speed steady
in order to avoid mechanical shock, till the motor stops running. Soft stop
output cut-off voltage equal to the initial voltage of starting.
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Soft stop mode can use setting item PL to set the soft stop current limit, in
soft stop, reduce the impact of high current, pay attention that, this soft start
current limit is a percentage calculated on the basis of starting current limit
value.
12.7 Free Stop Mode
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Set Code F9 (0)(free stop). In this stop mode, when the soft starter receive
the stop command, immediately disconnect the bypass contactor and ban
soft starter thyristors voltage output, motor gradually stop as load inertia. In
the situation of one drive more wiring, should set soft starter stop mode as
this, in order to avoid of the phase fault reporting when output switching;
V
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Chart12-6 1
-31-
V1.0
T