Eaton S611, Руководство пользователя

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64 S611 Soft Starter
MN03902011E—May 2012 www.eaton.com
Appendix E—Special Function Option
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. The start and stop ramp times are user
adjustable and are to be set for the application requirements.
The pump control option is a factory installed feature. Factory
installed options are designated by the eighth character in
the catalog number. Unmodified S611 soft starters have an
N as their eighth character. S611 soft starters with the pump
control option have a P as their eighth character, as in
S611xxx P 3S.
Installation
Install and wire your S611 soft starter per the instructions
found in the beginning of this manual.
Setup
All pump control parameters are set via the UI. Units
configured with the pump control option can activate this
feature by selecting the pump option under the UI “Start
Method” parameter.
Adjustment
All of the adjustments to the S611 soft starter are made as
noted in this user manual. The major difference between the
standard S611 soft starter and one with the pump start
option is the special algorithm for gentle start and stop with
centrifugal flow loads to minimize the potential for water
hammer.
Using the UI, set the S611 soft start configuration
parameters described below:
The Start Ramp Time parameter adjusts the start ramp. It has
a standard range of 0.5–180.0 seconds. The factory default is
20.0 seconds. The soft stop time is adjusted by
Pump Stop ,
which has a range of 5.0–120.0 seconds with the factory
default being 10.0 seconds. (
Note: The Stop Ramp Time
setting used in non-pump S611s has no effect on units with
the Pump Control Option installed if start method is Pump
Start.) These adjustments are application dependent, and
should be made to minimize any surge or water hammer
effects. Typically Pump Stop would not be set short because
the stop might not differ much from a coast-to-stop. The soft
stop time adjustment may often be in the range of 30–40
seconds, but needs to be set appropriately for the system
requirements. If reduction or elimination of water hammer is
not achieved, it may be necessary to lengthen
Pump Stop to
achieve the desired result. Note that long stop times will
result in greater motor heating than shorter stop times. This
can affect the number of start/stop cycles allowed per hour
due to the S611 soft starter or motor thermal limits.
Pump Control Option
100%
tr
Start Soft Pump Stop
Speed
Time (Seconds)
ts
Run
Coast to Stop
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