Cut Sheet

Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com V10-T17-47
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17.6
Technical Data and Specifications
Reduced Voltage Starters
Pump Control Option
This option is intended to
reduce the potential for water
hammer in a centrifugal pump
system by using a starting
and stopping algorithm
developed for pump control.
Upon a start command, the
speed of the motor is
increased, under the control
of the S611 soft starter
microprocessor, to achieve a
gentle start. After the speed
has reached its nominal
value, the bypass contactors
close and the pump operates
as with any other starter.
Upon a stop command, the
bypass contactors are
opened and the motor speed
is decreased in a tapered
manner, to gradually slow the
flow until the motor is
brought to a stop.
Pump Control Option
Edge and Level Sensing Control
Edge or Level Sensing is selected with the Start Control parameter in the Advanced Configuration
Menu. Factory default is Level Sensing.
Edge Sensing
Edge sensing requires 120 Vac
power be momentarily
applied to the Start terminal
(with the Permissive terminal
120 Vac) to initiate a start
under all conditions. After a
stop or fault occurs, the
120 Vac must be reapplied to
the start terminal before
another start can occur. This
control configuration should
be used when restarting of
the motor after a fault or stop
must be supervised manually
or as a part of a control
scheme. The cycling of
120 Vac power to the
Permissive terminal before
starting is required regardless
of the position of the auto
reset parameter.
Level Sensing
Level sensing will enable a
motor to restart after a fault is
cleared without cycling 120V
AC to the Permissive terminal
as long as:
●
Permissive terminal is
supplied with 120 Vac
●
The auto reset parameter
is set to enabled
●
All faults have cleared or
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 assure that any
restart occurs in a safe manner.
100%
t
r
potS pmuP tfoStratS
Speed
Time (Seconds)
t
s
Run
Coast to Stop