Functional Description
28 S811+ Soft Starter MN03900001E—November 2012
Level or Edge Sensing
Level or Edge Sensing determines how the soft starter
reacts to Start control commands after a fault trip has
occurred. It is important to be aware if the Start command is
a momentary or maintained signal. If the Start control signal
is momentary, then either Edge or Level Sensing may be
selected and S811+ operation will be the same, as in either
case only a momentary signal is placed on the Start terminal.
If the Start control signal is maintained, then the signal must
be removed, then reapplied to initiate a start if Edge Sensing
is selected.
Level or Edge Sensing is selected with the S1 DIP switch
located on the face of the S811+. The position of the switch
is verified in the Run Input Ctrl parameter in the Advanced
I/O Setup menu.
Level Sensing
Level sensing selection may be verified by observing the
status of the Run Input Control sub-parameter in the
Advanced IO Setup Menu. Level sense means that the
24 Vdc signal at the Start terminal may be continuous and
does not require voltage to be removed and reapplied after a
fault trip has occurred.
Level sensing will result in an automatic motor restart after a
fault when:
●
Fault condition is cleared.
●
The Permissive terminal is supplied with 24 Vdc.
●
The Reset Mode parameter is set to AUTO,
●
There is 24 Vdc power to the Start terminal (Start
command—maintained).
Level sensing will allow a motor restart after a fault when:
●
All faults remain cleared or reset.
●
The Permissive terminal is supplied with 24 Vdc.
●
The Reset Mode parameter is set to AUTO or MANUAL.
●
24 Vdc power to the Start terminal is again applied (Start
command—momentary)
This control configuration can be used where it is desirable to
restart a motor after a fault without additional manual or
automatic control. An example of this condition would be on
a remote pumping station where it is desirable to
automatically restart a pump after a power outage without
operator intervention.
In the AUTO RESET MODE, CAUTION must be exercised
to assure that any restart occurs in a safe manner.
Edge Sensing
Edge sensing (default) selection may be verified by observing
the status of the Run Input Control sub-parameter in the
Advanced IO Setup. Menu. Edge sense means that the 24
Vdc signal at the Start terminal must be removed (if
maintained) and reapplied after a fault trip has occurred. If
the Start signal is momentary, no further action is required to
restart the motor. The cycling of 24 Vdc power to the Start
terminal before starting is required regardless of the setting
of the Reset Mode parameter.
Edge sensing will allow a motor restart when:
●
Fault condition is cleared.
●
The Permissive terminal is supplied with 24 Vdc
●
The Reset Mode parameter is set to AUTO or MANUAL,
●
24 Vdc power to the Start terminal is reapplied (Start
command—momentary)
Edge sensing will allow a motor restart when:
●
Fault condition is cleared.
●
The Permissive terminal is supplied with 24 Vdc
●
The Reset Mode parameter is set to AUTO or MANUAL,
●
24 Vdc power to the Start terminal is removed, then
reapplied (Start command—maintained)
This control configuration can be used when restarting of the
motor after a stop command or fault must be supervised
manually or as a part of a control scheme.
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