WattMaster WCC III part 19 - Manual (Page 11)

18. SAT 3P INSTALLATION GUIDE
WCC III Technical Guide 18-9
Alternate Limits Selected By:
Specifi es the point that initiates the Alternate mode. When this
address is zero (or OFF), the Normal alarm limits are selected;
when it is one (or ON), the Alternate alarm limits are selected.
Limits Low High
On _____ _____ °. F
Off _____ _____ °. F
On (alt) _____ _____ °. F
Off (alt) _____ _____ °. F
Local Set _____ _____ °. F
This group of inputs specifi es the alarm limits for the “Normal,”
“Alternate,” and “Local Set” modes. Each mode has a LOW and
HIGH limit. When the value of the analog input goes out of these
limits, an alarm is generated, and the alarm will automatically
display and e-mail out.
There are two fi elds on this screen that determine which set of
limits are active—the status of the “Controlled by” fi eld and the
status of the “Alternate Limits selected by” fi eld. When the value
that has been input in the “Controlled by” fi eld is ON, either the
“On” limits or the “On (Alt)” limits are active depending on the
status of the value input in the “Alternate Limits selected by” fi eld.
If the value in the “Alternate” fi eld is On, the “On (Alt)” limits are
used, and when the “Alternate” value is OFF, the “On” limits are
used.
Alternate Limits Active Alarm
Controlled by: Selected by: Limits:
On Off On
On On On (Alt)
Off Off Off
Off On Off (Alt)
The local set alarm limits become active if the MCD quits
communicating with the satellite controller. After communications
are re-established, any alarms that occurred while the satellite was
in local set will be reported.
Limit overlap time after control change:
This specifi es the amount of time the WCC software will wait after
a control change (i.e., on/off schedule, alternate mode, local set
mode) before deciding to generate an alarm. The fi rst input is a
user-entered number from 1 to 60, and the second input is either
seconds or minutes. This second input is a “choice” fi eld; the list of
available choices will be displayed at the bottom of the screen:
<Seconds, Minutes>
You may make your selection by pressing the <space bar> until
the desired choice is selected and then pressing <Enter> .
------ BINARY SETPOINTS ------
____Above:____
____Below:____
These inputs are used to convert the analog signal to a binary (On/
Off) signal. The value that is going ON and OFF is a software point
referred to as a comparator. Each analog input has a comparator
associated with it named “Cn.” The comparator for analog input #1
is “C1,” analog input number 2 is “C2,” and so on. The status of the
comparator can be seen on the Analog Input Summary Screen.
When the
user has
selected:
The value of the comparator is:
OFF Above &
OFF Below: OFF when the Analog Input value is greater than the
ABOVE setpoint or less than the BELOW setpoint,
and ON when the Analog Input value is equal to
either one or between the two setpoints.
OFF Above &
ON Below: OFF when the Analog Input value is greater than
or equal to the ABOVE setpoint or until the Analog
Input value becomes less than the BELOW setpoint,
and ON when the Analog Input value is less than or
equal to BELOW setpoint or until the Analog Input
value becomes greater than the ABOVE setpoint.
ON Above &
OFF Below: OFF when the Analog Input value is less than or
equal to the BELOW setpoint or until the Analog
Input value becomes greater than the ABOVE
setpoint, and ON when the Analog Input value is
greater than or equal to the ABOVE setpoint or
until the Analog Input value becomes less than the
BELOW setpoint.
ON Above &
ON Below: OFF when the Analog input value is equal to either
one or between the two setpoints, and ON when
the Analog Input value is greater than the ABOVE
setpoint or less than the BELOW setpoint.
Because this is a “choice” fi eld, a list of available choices will be
displayed at the bottom of the screen:
<ON, OFF>
You may make your selection by pressing the <space bar> until
the desired choice is selected and then pressing <Enter> .
On Message #:
Off Message #:
Specifi es a pair of message numbers, the fi rst for the ON state and
the second for the OFF state of the comparator. These numbers
are used by the system to reference a message on the ON/OFF
Units Message Screen. For example, the comparator might be set
up to come on when the outside air temperature is below 55 °F for
economizer operation. Set up the On/Off Message Screen so that
message #3 is “ECON” and message #4 is “REFRIG.” The “On
Message” number would be “3” (ECON), and the “OFF Message”
number would be “4” (REFRIG).
Analog Input Screen