Cut Sheet

Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com V10-T17-49
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
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
started, 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, or
stalled after the soft start
time. The S611 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 S611 power
pole conductors to reach a
temperature that exceeds
their thermal rating. The S611
is equipped with sensors that
monitor the temperature of
the power poles. Over
temperature protection
occurs if the device's thermal
capacity is exceeded. The
soft starter will trip in over
temperature conditions,
preventing device failure.
The device pole temperature
value can be monitored
through the UI or the
communications network.
This feature can be of use in
determining an impending
over temperature trip
condition. Alarms can be
implemented in the process
monitoring system warning
of an impending trip before a
trip occurs, halting the
process. Costly system
shutdown can be avoided.
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 S611
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 S611 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 fr
om
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 S611 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 overload can be
manually reset through the UI
or through the communications
network.
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
present.
Phase Reversal
The S611 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 S611 can be configured
to operate under reversed
phase conditions (A-C-B).
Shorted SCR Detection
The S611 monitors the
operation of the power poles
and will trip under a shorted
SCR condition.
Open SCR Detection
The S611 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 S611 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
S611 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.
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
S611 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.