Functional Description
22 S801+ Soft Starter MN03900002E—November 2012 www.eaton.com
Current Limit Start
This mode is typically used when it is necessary to limit the
maximum current during start-up due to line power
limitations or other considerations. During a Current Limit
Start the S801+ applies a constant voltage to the motor,
resulting in limited current flowing through the motor’s
windings. The level of current is set by the Initial Torque
parameter. See below.
Note: Current Limit Starts are not recommended on variable
torque load applications like fans and pumps.
Attempting starts with the Current Limit set to a value
of 20% Initial Torque or lower are not recommended
as the motor may not develop adequate torque to
accelerate properly.
Current Limit
Soft Stop
The Soft Stop feature is used for applications that require a
controlled (ramp) extended stop. It is designed for high
frictional loads that tend to stop suddenly when voltage to
the motor is removed. During Soft Stop the voltage is
ramped to zero in the time set by the Soft Stop Time
parameter.
Note: The Soft Stop mode is not an electronic brake function
and will not stop a motor any faster than it would
normally take to coast to a stop under load.
Soft Stop
Initial
Torque
Kick
Start
Torq
Kick Start Time
100%
Bypass Bypass
Soft Start Time
Start Run
Current
Time (Seconds) Time (Seconds)
100%
Start Run
Speed
Soft
Stop Time
100%
Run Soft Stop
Speed
Time (Seconds)
Coast to Stop
(Speed)
Soft Stop Ramp
(Voltage)
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