Reduced Voltage Motor Starters
Run (FLA)
100%
Locked Rotor Torque
Time (Seconds)
Initial
Torque
Run
Max.
Allowed
100%
FLA
Current
Time (Seconds)
1.2
Operation
1
Starting and Stopping Modes
1
The S811 has a variety of starting and stopping methods to provide superior performance in the
most demanding applications. The motor can be started in either voltage ramp start or current
limit start mode. Kick start and soft stop are available within both starting modes.
1
Voltage Ramp Start
1
Provides a voltage ramp to the
motor resulting in a constant
1
torque increase. The most
commonly used form of soft
1
start, this start mode allows
you to set the initial torque
value and the duration of the
1
ramp to full voltage
conditions. Bypass contactors
1
close after ramp time.
1
Starting Characteristics—Ramp Start
1
1
Solid-State Starters
●
Adjustable initial torque
0–85% of locked rotor
torque
●
Adjustable ramp time
0.5–180 seconds (can be
extended with factory
modification)
1
1
1
1
1
Current Limit Start
Limits the maximum current
1
available to the motor during
the start phase. This mode of
soft starting is used when it
1
becomes necessary to limit
the maximum starting current
1
due to long start times or to
protect the motor. This start
1
Starting Characteristics—Current Limit Start
1
1
1
1
1
mode allows you to set the
maximum starting current as a
percentage of locked rotor
current and the duration of the
current limit. Bypass
contactors close after current
limit time.
●
Maximum current of
0–85% locked rotor current
●
Adjustable ramp time
0.5–180 seconds (can be
extended with factory
modification)
1
1
1
1
1
Reduced Voltage Motor Starters
100%
Locked Rotor Torque
Ramp
Time (Seconds)
Kick
Start
Run (FLA)
Ramp
Time (Seconds)
Run
Solid-State Starters
1.2
Kick Start
Selectable feature in both
voltage ramp start and
current limit start modes.
Provides a current and torque
“kick” for 0 to 2.0 seconds.
This provides greater initial
current to develop additional
torque to breakaway a high
friction load.
Starting Characteristics—Kick Start
●
●
0–85% of locked rotor
torque
0–2.0 seconds duration
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Soft Stop
Allows for a controlled
stopping of a load. Used
when a stop-time that is
greater than the coast-to-stop
time is desired. Often used
with high friction loads where
a sudden stop may cause
system or load damage.
Starting Characteristics—Soft Stop
●
Stop time = 0–60 seconds
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.2
Edge and Level Sensing Control
1
Edge Sensing
Edge sensing requires
1
+24 Vdc power be
momentarily applied to Pin 1
1
(with terminal P at +24 Vdc)
to initiate a start under all
1
conditions. After a stop or
fault occurs, the +24 Vdc
must be removed, then
1
reapplied to pin 1 before
another start can occur. This
1
control configuration should
be used when restarting of
1
the motor after a fault or stop
must be supervised manually
1
or as a part of a control
scheme. The cycling of
+24 Vdc power to Terminal 1
1
before starting is required
regardless of the position
1
of the auto reset switch on
the DIM.
1
1
1
Reduced Voltage Motor Starters
Solid-State Starters
Level Sensing
Level sensing will enable a
motor to restart after a fault
is cleared without cycling
+24 Vdc power to Terminal 1
as long as:
●
Terminal P is supplied with
+24 Vdc (to start from
Terminal Block, Input #3
must also be enabled)
●
The auto reset switch on
the DIM is set to enabled
●
All faults have been reset
This control configuration
should 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.
Note: If the auto reset feature
is used, CAUTION must be
exercised to ensure that any
restart occurs in a safe manner.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Loading...