Hired-Hand System 1000 Power Curtain - Manual (Page 7)

System 1000 Power Curtain Features
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Unit Sensors
The Unit Sensors option describes which sensor, or combination of sensors the
controller uses to operate the controller. Any inside sensor, or any combination
of the three inside sensors is allowed.
The controller will take the temperature given by the sensor, (or average
temperature for the combination of sensors) and operate the power unit as
needed to maintain target temperature.
Power Unit ON/OFF
This setting is used as it’s name implies. Answer “Off” to the prompt (using the
change setting down arrow key) to disable the PowerTrak. Press Select Feature
to move to the next feature.
Set Trend Index
Trend Index is a term Hired-Hand uses for a feature in the System 1000
Power Curtain Controller. The term Trend Index refers to a factor used
in an extremely complex mathematical scheme. This mathematical
scheme is used to spot trends in temperature changes over time, and
respond more rapidly to sudden changes in these trends.
The trend index has a setpoint from .1 to .5 in increments of .1.
As the value increases, the controller takes more aggressive action to
anticipate and correct for changes in trends.
As the controller operates it checks temperature every two minutes. It
compares the temperature to target temperature and will move the
curtain machine a set amount for each degree away from target
temperature.
Variable Speed
This feature allows the operator to set up one fan circuit with
variable speed capability (up to a total of ten amps). With this feature
activated, the controller will vary the speed of the fans on that circuit as
temperature changes. (Fan speed will increase as temperature increases,
and vise versa.) When this feature is selected, the controller will prompt
you for certain information. This information is listed on the following
page.
Maximum Speed -- Usually set at 100% to gain maximum cooling
capability
Maximum offset -- The distance in degrees above or below target
temp when the fan will reach maximum speed
Minimum Speed -- The minimum speed the fans on the Variable
speed circuit will run.
Minimum Offset -- The distance in degrees below target temp when
the variable speed circuit will engage the fan(s).
Var. Speed Sensors -- Use the change setting up and down arrow
keys to chose the sensors to control the variable speed circuit.