WattMaster WCC III part 4 - Manual (Page 184)

WCC3.EXE SCREEN DESCRIPTIONS
WCC III Technical Guide 3-180
PWM Mode
The PWM mode monitor analog input and convert it to binary
output with pulse width modulation. The PWM mode has three
setpoints—PWM period, Maximum Input, and Minimum Input.
When the monitored analog input exceeds Maximum Input, this
binary will always be ON. When the monitored analog input drops
below Minimum Input, this binary will always be OFF. When
the monitored analog input is between the Maximum Input and
Minimum Input, the binary will modulate between ON and OFF
based on the monitored analog input value. For example, the PWM
period is 100 seconds, the Maximum Input is 10, the Minimum
Input is 0. When the monitored analog input is less than 0, this
binary will be OFF all of the time. When the monitored analog
input is above 10, the binary will be ON all of the time. When the
monitored analog input is 5, the binary will be OFF for 50 seconds
and ON for 50 seconds. When the monitored analog input is 3,
the binary will be OFF for 70 seconds and ON for 30 seconds.
When the monitored analog input is 8, the binary will be OFF for
20 seconds and ON or 80 seconds.
Value is the modulation of ______ with period
of ______ seconds.
The “modulation of” is an analog input point within the system. A
valid WCC III analog structured value must be used as an analog
input value for this screen to operate correctly. Satellite Analog
Input (XXXAY), Satellite Data Register “a” (XXXRYa), Satellite
Data Register “b” (XXXRYb), Satellite Analog Output (XXXPY),
Global Analog (GAZZZ), where XXX equals 1 to 239, Y equals 1
to 8, and ZZZ equals 1 to 256.
The “period of” is the total amount of time in one cycle. This is the
combined amount of time on and off in one cycle. The term duty
cycle describes the proportion of on time to the regular interval or
period of time; a low duty cycle corresponds to low power, because
the power is off for most of the time.
maximum value of _______
When the monitored analog input exceeds Maximum Input, this
binary will always be ON.
minimum value of _______
When the monitored analog input drops below Minimum Input,
this binary will always be OFF.
In Local Set this global defaults to _____.
Specifi es the state (or value) of the binary global when the satellite
is in the Local Set mode. The satellite is in local set when it has lost
communications with the front end computer.
Since the fi rst fi eld is a “choice” fi eld, the list of available choices
will be displayed at the bottom of the screen:
<Off, On, Last Value>
Make your selection by pressing the <space bar> once for each
choice until the desired contact state has been selected, and then
press
<Enter> .
------------ALARM-------------
Set Condition: None Type: 0 Message 0
The system has the capability of generating an alarm if the value of
this binary global is either ON or OFF.
Set the condition to “None” to not generate an alarm whenever the
Binary Global is Off or On. Set the condition to “On” to generate
an alarm whenever this Binary Global is On. Set condition to “Off”
to generate an alarm whenever this Binary Global is Off.
Because this is a choice fi eld, the list of available choices will be
displayed at the bottom of the page.
<None, Off, On>
Make your selection by pressing the <space bar> once for each
choice until the desired event type has been selected, and then
press
<Enter> .
Type specifi es the priority (or “importance”) level for any alarms
generated by this input. Alarm types range from one (highest
priority) to eight (lowest priority). The system displays and e-mails
higher priority alarms fi rst. (The fi rst fi ve alarm priorities (1-5)
have e-mail-out-on-alarm capabilities.)
The message number corresponds to a message on the ON/OFF
Message Screen.
Binary Global PWM Mode Screen