ABB PSTX Series Installation And Commissioning Manual page 125

7.20.5 Step down level
When the Softstarter receives a stop signal the Softstarter
first decreases the output voltage to the motor in a quick
stop ramp, from full voltage down to set Step down
voltage level. Then the Softstarter controls the output
voltage in a stop ramp.
You can adjust the step down level for torque control.
When using voltage ramp, set it to 80%. It can be
necessary to adjust the step down level if the load is too
high or too low.
Step down level has these parameters:
Parameter
28.05 Step down level
7.20.6 System mode
Select between:
• Normal mode
• Demo mode
• Small motor mode
Normal mode
Normal mode is the default setting and is used in all
situations except the ones given below.
Demo mode
Demo is used mainly for training purposes to simulate a
load condition without having the Softstarter connected
to main power.
WARNING
When the Softstarter is connected to a motor, do
not select demo mode, a direct start will occur.
Small motor mode
Small motor mode is used for basic testing purposes,
when using a smaller motor than the PSTX is specified
for. The Softstarter is able to start the motor, but some
functions and protections are disabled.
INFORMATION
The current through the Softstarter has to be at
least 3A when using small motor mode.
System mode has these parameters:
Parameter
28.41 System mode
7.20.7 TOR relay delay time
Set the delay time from Top Of Ramp until the Top Of
Ramp relay is on
TOR relay delay time has these parameters:
Parameter
28.03 TOR relay delay time
Description
Set the level from where the stop
ramp initiates.
Description
Sets the run mode.
Description
Set the delay time from Top Of Ramp until
the Top Of Ramp relay is on
1SFC132081M0201 | Installation and commissioning manual | Functions
Setting range Default value
10% ... 100% 80%
Setting range Default value
Normal, Demo, small Normal
motor
Setting range Default value
0.0 ... 300.0 s 0.0 s
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