Cut Sheet

Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com V10-T17-71
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17.6
Technical Data and Specifications
Reduced Voltage Starters
Jam
Excessive current and torque
up to locked rotor levels can
occur in a jam condition. The
condition can result in stress
and damage to the motor, load,
mechanical system, and the
electrical distribution system.
Jam protection prevents the
stress and damage from a
jam during normal run. After
the motor is in bypass, a
current greater than 300%
FLA setting will cause the
starter to trip on a jam fault.
Stall
Excessive current and torque
up to locked rotor levels can
occur in a stall condition. The
condition can lead to an
overload trip and result in
stress and damage to the
motor, load, mechanical
system, and the electrical
distribution system. Stall
protection prevents stress and
damage to a motor that has
not come up to speed during
the soft start time. The S811+
will trip to protect the system
in the event that the motor did
not get to the rated speed in
the defined soft start period. A
current greater than 200% FLA
at the end of the soft start
period will cause the starter to
trip on a stall fault.
Pole Over Temperature
High ambient temperatures,
extended ramp times and
high duty cycle conditions
may cause the S811+ power
pole conductors to reach a
temperature that exceeds
their thermal rating. The
S811+ is equipped with
sensors that monitor the
temperature of the power
poles. Over temperature
protection occurs if the
power pole’s thermal
capacity is exceeded. The
soft starter will trip in over
temperature conditions,
preventing device failure.
Each power pole temperature
value can be monitored
through the DIM or the
communications network.
This feature can be of use in
determining an impending
over temperature trip
condition.
When using a
communications network,
alarms can be implemented
in the process monitoring
system warning of an
impending trip before the trip
occurs, halting the process.
Phase Loss
Loss of a phase can cause
a significant increase in
the current drawn in the
remaining two phases.
Phase loss can lead to motor
damage before an eventual
overload trip occurs. Phase
loss is typically an indication
of a failure in the electrical
distribution system. The
S811+ will detect a phase
loss and trip if any phase
current
drops below a preset value.
The phase loss trip level is
adjustable from 0% to 100%
of the average of the other
two phase levels with an
adjustable trip delay of 0.1
to 60 seconds.
Phase Imbalance
Phase current or voltage
imbalance can cause a
significant increase in
the current drawn in the
remaining two phases.
Phase imbalance can lead
to motor damage before an
eventual overload trip. Phase
imbalance is typically an
indication of a failure in the
electrical distribution system
or the motor. The S811+ will
detect both current and
voltage phase imbalances
and trip if any phase becomes
imbalanced as compared to
the average of the other
two phases.
The phase current imbalance
trip level is adjustable from
0% to 100% of the average
of the current in the other
two phases with an
adjustable trip delay of
0.1 to 60 seconds.
The phase voltage imbalance
trip level is adjustable from
0% to 100% of the average
of the voltage in the other
two phases with an
adjustable trip delay of
0.1 to 60 seconds.
Reset Mode
The S811+ can be set up for
automatic or manual reset
on trip. The manual reset
mode requires the operator to
physically press the
RESET button located on
the soft starter. The trip can
be manually reset through the
DIM or through the
communications network.
The trip can also be
electrically reset by
energizing a 24 Vdc input on
the control terminal block.
The automatic reset mode
allows the soft starter to be
automatically reset as soon
as the trip condition is no
longer present. With the
automatic reset mode, after
the fault is no longer present,
the motor will be restarted
as soon as a valid start signal
is
pr
esent.
Phase Reversal
The S811+ can determine
if the proper line phase
sequence is present by
default. The device will trip
if the line phase sequence is
something other than A-B-C.
The S811+ can be configured
to operate un
der reversed
phase conditions (A-C-B).
Shorted SCR Detection
The S811+ monitors the
operation of the power poles
and will trip under a shorted
SCR condition.
Open SCR Detection
The S811+ monitors the
operation of the power poles
and will trip under an open
SCR condition.
Low Current
Low current conditions can
be a result of a loss of load
or a failure in the mechanical
system. The S811+ has low
current protection that will
trip if the average rms current
falls below a preset value.
The low current protection
can be programmed as a
percent of motor FLA from
0% to 100%.
Low Voltage
Low voltage conditions
can result from disturbances
in the electrical power
distribution system. Low
voltage conditions can cause
a malfunction and damage
to electrical equipment.
The S811+ has low voltage
protection that will trip if the
average rms voltage falls
below a preset value. The
low voltage protection can
be programmed as a percent
of nominal voltage from
1% to 99% with a trip delay
of 0.1 to 60 seconds to
accommodate short
temporary voltage drops
during the start process.
High Voltage
High voltage conditions can
result from disturbances in
the electrical power
distribution system. High
voltage conditions can cause
malfunctions or failures of
electrical equipment. The
S811+ has high voltage
protection that will trip if
the average rms voltage is
greater than a preset value.
The high voltage protection
can be programmed as a
percent of nominal voltage
from 101% to 120% with
a trip delay of 0.1 to
60 seconds.