S611 Soft Starter MN03902011E—May 2012 www.eaton.com 21
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 S611
operation will be the same, as in either case only a
momentary signal is placed on the start terminal of TB3. If
the start control signal is maintained and edge sensing is
selected, the signal must be removed, then reapplied to
initiate a start.
Level Sensing
Level sensing (default) is selected with the Start Control
sub-parameter in the Advanced Config. menu. Level sensing
means that the 120 Vac 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 when:
●
All faults remain cleared or reset
●
The Permissive terminal is supplied with 120 Vac
●
The Reset Mode parameter is set to AUTO
●
There is 120 Vac power to the Start terminal (Start
command—maintained)
Level sensing will allow a motor restart when:
●
All faults remain cleared or reset
●
The Permissive terminal is supplied with 120 Vac
●
The Reset mode parameter is set to AUTO or MANUAL
●
120 Vac 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.
CAUTION
In the AUTO Reset mode, CAUTION must be exercised to
assure that any restart occurs in a safe manner.
Edge Sensing
Edge sensing is selected with the Start Control
sub-parameter in the Advanced Config. menu. Edge sensing
means that the 120 Vac 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 120 Vac 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:
●
All faults remain cleared or reset
●
The Permissive terminal is supplied with 120 Vac
●
The Reset Mode parameter is set to AUTO or MANUAL
●
120 Vac power to the Start terminal is reapplied (Start
command—momentary)
Edge sensing will allow a motor restart when:
●
All faults remain cleared or reset
●
The Permissive terminal is supplied with 120 Vac
●
The Reset Mode parameter is set to AUTO or MANUAL
●
120 Vac 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.
Auxiliary Relays
Terminal block 2 (TB2) uses two (2) auxiliary relay functions
to indicate status of S611 soft starter.
1. Terminals 13 and 14 (Programmable)—At default setting,
relay contacts use 120 Vac to provide bypass contactor
status. The contact closes upon bypass and will remain
closed until a stop is initiated or a fault occurs. The
motor and load may continue to rotate after a stop is
initiated if soft stop is being used or if the load inertia is
high.
2. Terminals 96, 97 and 98 (Programmable)—At default
setting, relay contacts use 120 Vac to provide fault or
ready status indication.
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