Poultry House Control
72
emergency pressure operation. In this event
the controller opens all known air sources to
provide air. This situation typically occurs
when there is an equipment failure preventing
the usual air sources from functioning. An
emergency pressure event latches the
controller until the operator performs an
Alarm Reset in the Management Menu. All
devices continue to operate at their
temperature settings except for those that
allow air to enter the facility.
f. Curtain Position in Emergency
Pressure: for many users the default
100% open is satisfactory. However, in
cold climates with young birds, it may be
necessary to prevent total opening of
curtains in the event of a side vent failure
producing high pressure. The curtains
(tunnel and natural curtains) open this
amount in an emergency pressure event.
g. Minimum Tunnel Curtain Level (%)
: if
pressure during tunnel is selected, this is
the minimum that the tunnel curtain will
open on entering tunnel ventilation
without regard to pressure. High pressure
will induce further opening of the tunnel
curtain. If no pressure during tunnel is
chosen, this parameter sets the actual
curtain position in tunnel ventilation. It
will not open further in this case.
h. Minimum Tunnel Curtain Level to
Start Fans: during tunnel curtain
movement, the Platinum Plus turns off all
exhaust and tunnel fans until the curtain
reaches this position. This feature
alleviates problems with tunnel curtains
sticking under static pressure.
i. Vent Motor Slow/Fast
: enter 1 for fast if
your side inlets fully open or close in less
than 60 seconds. If they take longer than
this, select the slow option.
j. Time to Produce Pressure (seconds)
.
Enter the length of time to reach target
pressure when minimum ventilation fans
cycle on. The default of 10 seconds is
satisfactory in most cases, but some
buildings take longer to reach target
pressure. If the automatic inlet advance
fails to function, try increasing this
parameter to 20 seconds.
7. Curtains
a. Stage Step Size, %: this is the standard
movement of conventional curtains during
natural ventilation. The curtains initially open
the ‘minimum’ amount specified in Control,
:Min Vent Timer upon entry into Natural
Ventilation, then this amount each step
thereafter. Note that the minimum and
maximum curtain positions in the Control,
Min Vent menu do not appear unless Natural
Ventilation is turned on.
b. Number of Stages for Calibration
: to ensure
accurate positioning of the curtains, the
Platinum Plus may periodically calibrate the
curtain position. This parameter sets the
maximum number of curtain movements or
stages between calibrations. Calibration
consists of forcing the curtain to the nearest
limit, 0% or 100% with adequate overtime to
ensure reaching the limit switch. Then the
curtain returns to its proper position. In the
event several curtains require calibration, they
calibrate one at a time to reduce the amount
of restriction to normal ventilation. The stage
counter resets automatically each time the
curtains reach a limit point to prevent
excessive calibration.
c. Delay Between Stages (minutes)
: this is the
minimum length of time to wait between
curtain adjustments in natural ventilation.
Five minutes has proven to be a reasonable
delay.
d. Stop Fans Curtain Move, Total %
: sets the
curtain opening up to which fans will stop
temporarily when any curtain moves. The
term ‘total %’ means that the sum of all
conventional curtain openings must total this
amount. For example, 3 curtains at 20% each
totals to 60%, as does 2 curtains at 0% and
one at 60%.
e. Per Cent to stop fans on Natural
: This is
the ‘total’ opening of curtains at which to stop
stir fans.
f. Hold Relay at Edges
: this option selects
whether to keep curtain and side vent relays
active at the travel limits, or to turn them off
after a 50% overrun. Choosing to keep the
relays active provides visual feedback on the
indicator lights, and resets any curtain or side
vent machines that may be out of position due
to over heating when they reset themselves.
Leaving this parameter off reduces damage in
the event that the limit switches in the curtain
or side vent machine failed. Most machines
today have both limit switches and safety
dead out switches behind them to minimize
the risk of a machine failing and damaging a
building by reeling in many feet of cable.
8. Curtain Minimum Ventilation
a. Curtain No. 1 Min. Vent. Cycle: choose
whether conventional curtain number 1
participates in curtain purge cycles to
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