WattMaster WM-WCC3-TGD-01B - Manual (Page 325)

4. SCUSCR.EXE SCREENS
WCC III Technical Guide 4-15
WCC III VAV BOX III Trend Logging
Alarm Detection and Reporting
The VAVBOX TUC-2R controller continuously performs self
diagnostics during normal operations to determine if any operating
failures have occurred. These failures can be reported to the user in
several ways, depending on the type of system and options installed
by the user. If WCC III computer front-end software is installed,
the alarms will be reported on the Alarm summary screen of the
WCC3.exe program and will be logged to disk of the WCC III
- MCD. These system logs can be downloaded and viewed with
the WCC3Utilies.exe program. If the WCC III - MCD is set up to
Email out alarms, then the alarm can initiate an Email callout to
alert someone to the alarm condition. See the WCC III computer
front end WCC3.exe program operations manual for further
information on this topic.
Internal Trend Logging
The Satellite controller can maintain an Internal Trend Log which
records a fi xed set of values at an interval programmed by the user.
In order to utilize these logs, a computer with WCC III front-end
software installed must be able to communicate with the WCC III
system.
The available options for Satellite internal trend logging are:
Change of State, Run Time Total, Analog Trend, and Analog
Peaks. The Change of State trend log can log the on time and
date, and off time and date for up to 8 binary points per Satellite.
The Run Time Total trend log can log the total accumulated on
or off time in seconds, minutes, or hours of up to 8 binary points
within the satellite controller. The total amount of on time that can
be accumulated without being reset is 9999 seconds, minutes, or
hours. The Analog Trend log can log the current analog value for
up to 8 analog points within the satellite. The timed interval for the
Analog Trend logging can be from 1 to 99 minutes, or from 1 to
99 hours. The Analog Peaks trend log will record the time, date,
and value of the Last Low Peak and the time, date, and value of the
Last High Peak for up to 8 analog points.
On the Change of State and Analog Trend there are 48 log
positions available. Once the last (48th) position has been recorded,
depending on how the user programs the log, it can Roll(saving the
latest and deleting the oldest), or stop until the log is reset. This
means the user is required to retrieve the logs at an interval that is
shorter than the duration of the last 48 logs.
Shown below are some log intervals and the duration of 48 logs.
1 Minute Interval .......................... 48 Minute Duration
15 Minute Interval ........................ 12 Hour Duration
30 Minute Interval ........................ 24 Hour Duration
60 Minute Interval ........................ 48 Hour Duration
8 Hour Interval ...............................16 Day Duration
The items that can be logged in the log are listed below:
•
Date (Automatic)
•
Time (Automatic)
•
Space Temperature (Analog Input “AX” with X =
1 to 8)
•
Date and Time of latest High and Low Space
Temperature Peaks
•
Cooling/Heating Demand (Data Register A
(“RXA” with X = 1 to 8)) Note: This point will
read out as a whole number with no decimal,
examples: a 3.4 cooling demand will read out 34, a
2.5 heating demand will read out -25
•
Supply Air Temperature (User programmable
Global Analog “GAXXX” with X = 1 to 256)
•
Push Button Override Status (Logic Switch/Input
“LX” with X = 1 to 8)
•
Airfl ow on Pressure Independent Terminal Units
(Data Register B (“RXB” with X = 1 to 8))
•
Damper Position (Analog Output “PX” with x = 1
to 8)
For more information on Internal Trend Logging, see chapter 3 of
the WCCIII manual.
CAUTION: These logs are subject to loss if a long power
outage occurs because there is no battery backed memory
on the VAVBOX controller. These values are stored on the
Satellite controller and its memory may only last up to 3 days.
External Trend Logging
Any addressable point on the WCC III system is capable of being
trend logged with the WCC3Trendlog.exe program. See section 8
for further details.