Orion System SA E-BUS Controller - Manual (Page 52)

Zone
Zone
Sequence of Operations
SA E-BUS Controller Technical Guide
52
Scheduling
The SA E-BUS Controller has an internal power source for the Real
Time Clock (RTC) that allows the controller to keep the time and ac-
curately control scheduling. It can also broadcast the time to the VAV/
Zone Controllers if that option is confi gured.
The SA E-BUS Controller has an internal 7-day Schedule with 2 Start/
Stop Events per day. You can also have 1 Holiday Schedule with 2 Start/
Stop Events per day. This Holiday Schedule can be used for 14 different
Holiday periods.
You can change the time on the SA E-BUS Controller through the Modu-
lar Service Tool, Modular System Manager, or the System Manager TS.
You can also broadcast the time and date to all SA E-BUS Controllers by
using a Personal Computer and the Prism Computer Front-End Software.
The Internal Scheduling in the SA E-BUS Controller also includes a
Self-Teaching Optimal Start Routine that can be activated by entering
a value of 1.0 or greater for the Soak Multiplier Setpoint. The Optimal
Start function can only be used if your SA E-BUS Controller has a Space
Temperature Sensor installed and it is being used as the Controlling
Sensor or if you are using WattMaster VAV/Zone controllers with the
SA E-BUS Controller.
No adjustments other than the Soak Multiplier are required because the
SA E-BUS Controller monitors how long it takes to reach the Target
Temperature each day and adjusts the Starting Time accordingly. That
means the fi rst day you operate your HVAC unit, it will not be able to
Optimally Start because it does not have a history of previous Starts
and their results. After the fi rst day, the SA E-BUS Controller will begin
adjusting the Start Time, and after six Normally Scheduled Starts have
occurred, the Optimal Start Routine will have gathered enough data
to provide an accurate Pre-Start based on the learned conditions. This
is an ongoing learning process of the six previous starts, so the unit
automatically adjusts for the changing seasons. If you don’t need this
feature, but you are using the Space Temperature Sensor as the Con-
trolling Sensor, you can set the Soak Multiplier to zero to eliminate the
Optimal Start Routines.
Internal Trend Logging
Internal Trend Logging
The SA E-BUS Controller continuously maintains an Internal Trend
Log, which records a fi xed set of values at a user-programmed interval.
These values can be retrieved only with the Prism Computer Front-End
Software. If you do not have a computer with Prism Software installed
and connected to the system communications loop, you do not have
access to these logs.
There are 120 log positions available. Once the last (120th) position
has been recorded, the log jumps back to the fi rst position and begins
overwriting the old data. This means the you will need to retrieve the
logs at an interval that is shorter than the duration of the last 120 logs
Shown below are some log intervals and the duration of 120 logs.
1 minute interval = 2 hours
12 minute interval = 24 hours
15 minute interval = 30 hours
30 minute interval = 60 hours
60 minute interval = 120 hours
The fi xed items in the log are listed below:
Date
Time
Space Temperature
Entering Water Temperature
Entering Air Temperature
Cooling Setpoint
Heating Setpoint
Supply Air Temperature
Supply Air Temperature Setpoint
Entering Humidity
Space Humidity
Water Side Economizer Position (Analog Output #1)
VFD Fan (Analog Output #2)
Modulating Heating (Analog Output #1)
Modulating Cooling Stage 1 (Analog Output #2)
Digital Compressor Stage 2 (Analog Output #3)
Modulating Reheat Position
Coil A Suction Pressure
Coil B Suction Pressure
Circuit A Head Pressure
Circuit B Head Pressure
Condenser Signal A
Condenser Signal B
WSE Bypass A
WSE Bypass B
On Board Relay Status (Bit Pattern)
Expansion Module Relay Status (Bit Pattern)
These items and values are explained in greater detail in the Prism
Computer Front-End Software Technical Guide.