The auxiliary input is primarily used for the four functions listed below. Figure 3.10 illustrates a typical control cycle with
an auxiliary input.
NOTE: REFER SECTION 5.3.3 for auxiliary control software settings.
BiGain Control:
StandBy:
(Refer Figure 3.11)
Hold:
(Refer Figure 3.11)
Inverse Actuator
Control Action:
Two control gain settings: useful for normal control and an “other” condition were
normal gains do not provide stable flo , especially for conditions around the
minimum controllable flow rates for Emech control valves
StandBy pauses the response of the actuator after receiving the enble auxiliary
signal. The actuator will remain in the paused position until...
i) The signal is disabled, in which case the actuator will resume control.
ii) The pause time expires (StandByTimeout) then the actuator will move to a
“Angle StandBy” flow position
The actuator will stay indefinitely in the StandBy position until..
i) The signal is disabled: then the actuator will go to the HOLD position and
either timeout (TimeHold) and return to normal control, OR return to the
StandBy position after receiving the enabled signal again.
With normal operation the actuator opens counter clockwise from the closed
position. Inverse operation implies a clockwise opening direction. This feature is only
supported with Emech F4 mixing valves.
Figure 3.10: StandBy and Hold control cycle.
Armstrong
International
221
Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
Phone (269) 279-3602 Toll Free (888) HOT-HOSE (468-4673)
Designs, materials, weights and performance ratings are
approximate and subject to change without notice. Visit
armstrong
international.com/emech for up-to-date information.
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