Cutler Hammer, Div of Eaton Corp Solid-State Starters Features and Benefits
Reduced Voltage Motor Starters
Solid-State Starters
1.2
Features and Benefits
●
Communication
capabilities with various
protocols
●
The DIM (Digital Interface
Module) provides an
intuitive, easy-to-use
human interface with
powerful configuration
capabilities to maximize
system performance
●
Door or device mounted
DIM enables users to
safely configure,
commission, monitor and
troubleshoot the system at
the electrical panel without
opening the enclo
eliminating the possibility
an arc flash incident
●
System operating
parameters can be
monitored enterprise-wide
through a communications
network. Increase uptime
by providing data for
process management and
preventive diagnostics
Protective Features
All protective features can be configured, enabled or disabled with the DIM or through the
communications network.
Motor Overload
The S811 includes electronic
overload protection as
standard. The overload meets
applicable requirements for
a motor overload protective
device. The overload protects
the motor from over heat
conditions with the use of
sophisticated algorithms that
model true motor heating,
resulting in superior motor
protection and fewer
nuisance trips.
The S811 calculates a thermal
memory value based on the
heat energy introduced into
the motor during the start
process. A 100% value
represents the maximum
safe internal temperature of
the motor.
sure door,
●
Run internal bypass mode
greatly reduces internal
heating created by the
greater power dissipation
in the SCRs. Bypass
contactor directly connects
the motor to the line and
improves system efficiency
by reducing internal power
losses
●
Internal solid-state overload
protection provides accurate
current measurement and
trip settings. Sophisticated
algorithms solve a series
of differential equations
that model true motor
of
heating and cooling,
resulting in superior motor
overload protection while
minimizing nuisance trips.
Advanced selectable
protective features
safeguard the motor
and system against a
variety of system faults
●
Internal run bypass
contactors and overload
protection eliminate the
need for additional devices,
reducing enclosure sizes,
minimizing installation and
wiring time, and reducing
overall assembly size
and cost
When the thermal memory
value reaches 100%, an
overload trip will occur
removing power to the
motor. Upon trip, the S811
stores the calculated motor
heating value and will not
allow a motor re-start until
the motor has a thermal
memory value of less than
100%. This feature ensures
the motor will not be
damaged by repeated
overload trip, reset and restart cycles.
The thermal memory value
can be monitored through the
DIM or the communications
network. The thermal memory
value can be of great use in
determining an impending
overload trip condition.Alarms
can be implemented in the
●
Wide range of overload
FLA settings (31–100%
of rated current) and a
selectable trip class (5–30)
offers users the flexibility
to fine tune the starter to
match specific application
requirements
●
Variable ramp times and
torque control settings
provide unlimited starting
configurations, allowing
for maximum application
flexibility
●
Kick-start feature enables
soft starting of high
friction loads
●
Soft stop control for
applications where an
abrupt stop of the load
is not acceptable
●
Pump control option with
sophisticated pump
algorithms on both starting
and stopping that minimize
the pressure surges that
cause water hammer. The
pump control option will
maximize the life of the
pump and piping systems
while minimizing the
downtime caused by
system failure
process monitoring system
warning of an impending trip
before a trip occurs halting
the process. Costly system
downtime can be avoided.
The trip current is adjusted to
match the specific application
requirements by entering the
motor nameplate full load
current rating and trip class.
The FLA parameter is
adjustable from 32% to 100%
of the unit’s rated current.
The overload trip class is
adjustable from class 5
through class 30. The overload
is ambient temperature
compensated—meaning its
trip characteristics will not
vary with changes in ambient
temperature. The overload
protection can be enabled,
disabled, or disabled on start.
●
Six SCRs control all three
motor phases, providing
smooth acceleration and
deceleration performance
●
Soft acceleration and
deceleration reduces
wear on belts, gears,
chains, clutches, shafts and
bearings
●
Reduce the peak inrush
current’s stress on the
power system
●
Manage peak starting
torque to diminish
mechanical system
wear and damage
●
24 Vdc control voltage
enhances personnel
and equipment safety
●
Removable, lockable
control terminal block
reduces maintenance
costs. Also provides the
opportunity for OEMs to
reduce assembly and test
costs by utilizing preassembled wire harnesses
Short Circuit
The use of a short-circuit
protective device in
coordination with the S811
is required in branch motor
circuits by most electrical
codes. Short-circuit
coordination ratings with
both fuses and Eaton molded
case circuit breakers are
available providing customers
with design flexibility.
The S811 has short-circuit
coordination ratings as
an open component, an
enclosed starter, and in
a motor control center.
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1.2
Reduced Voltage Motor Starters
Solid-State Starters
Jam
1
Excessive current and torque
up to locked rotor levels can
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occur in a jam condition. The
condition can result in stress
and damage to the motor, load,
1
mechanical system, and the
electrical distribution system.
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Jam protection prevents the
stress and damage from a
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jam during normal run. After
the motor is in bypass, a
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current greater than 300%
FLA setting will cause the
starter to trip on a jam fault.
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Stall
1
Excessive current and torque
up to locked rotor levels can
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occur in a stall condition. The
condition can lead to an
overload trip and result in
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stress and damage to the
motor, load, mechanical
1
system, and the electrical
distribution system. Stall
1
protection prevents stress and
damage to a motor that has
1
not come up to speed during
the soft start time. The S811
will trip to protect the system
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in the event that the motor did
not get to the rated speed in
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the defined soft start period. A
current greater than 200% FLA
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at the end of the soft start
period will cause the starter to
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trip on a stall fault.
Pole Over Temperature
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High ambient temperatures,
extended ramp times and
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high duty cycle conditions
may cause the S811 power
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pole conductors to reach a
temperature that exceeds
their thermal rating. The S811
1
is equipped with sensors that
monitor the temperature of
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the power poles. Over
temperature protection
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occurs if the power pole’s
thermal capacity is exceeded.
The soft starter will trip in
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over temperature conditions,
preventing device failure.
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Each power pole temperature
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value can be monitored
through the DIM or the
communications network.
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This feature can be of use in
determining an impending
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over temperature trip
condition.
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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 present.
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
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.
der reversed
un
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.
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