64
AC-SVX002C-EN
Sequence of Operation
This section provides basic information on chiller
operation for common events. Adaptive control
algorithms are used on these chillers. This section
illustrates common control sequences.
Software Operation Overview
The following figure is a diagram of the five possible
software states. This diagram can be thought of as a
state chart, with the arrows and arrow text, depicting
the transitions between states:
•
The text in the circles is the internal software
designations for each state.
•
The shading of each software state circle
corresponds to the shading on the time lines that
show the chiller’s state.
There are five generic states that the software can be
in:
•
Power Up
•
Stopped
•
Starting
•
Running
•
Stopping
S h u ttin g D o w n
R u n n in g
o r
R u n n in g L im it
S to p p e d
o r
R u n In h ib it
A u
to
C o
m
m
a n
d
C o
n f
irm
e d
S t
a r
t
S to
p
C o
m
m
a n
d
D ia
g n
o s
tic
C o
n f
irm
e d
S h
u t
d o
w
n
B o o t a n d
S e lf T e s t
S to p C o m m a n d o r D ia g n o s tic
A u to
o r
W a itin g to S ta rt
Chec
k for
Differential
to Start
Check for
Differential
to Stop
R e
lea
s e
o f
In
h ib
it
P o w e r U p
In the following diagrams:
•
The time line indicates the upper level operating
mode, as it would be viewed in the Tracer
®
AdaptiView
™
.
•
The shading color of the cylinder indicates the
software state.
•
Text in parentheses indicates sub-mode text as
viewed in the Tracer
®
AdaptiView
™
.
•
Text above the time line cylinder is used to illustrate
inputs to the UC800. This may include user input to
the Tracer
®
AdaptiView
™
touch screen, control
inputs from sensors, or control inputs from a
generic BAS.
•
Boxes indicate control actions such as turning on
relays, or pulsing compressor load or unload
solenoids.
•
Smaller cylinders under the main cylinder indicate
diagnostic checks.
•
Text outside a box or cylinder indicates time-based
functions.
•
Solid double arrows indicate fixed timers.
•
Dashed double arrows indicate variable timers.
Power Up Diagram
The following diagram shows the respective TD7
AdaptiView
™
screens during a power up of the UC800
and display. This process takes 25 seconds for the
UC800 and 90 seconds for the display. On all power
ups, the software model always will transition through
the 'Stopped' Software state independent of the last
mode. If the last mode before power down was 'Auto',
the transition from 'Stopped' to 'Starting' occurs, but it
is not apparent to the user.
Figure 46.
Sequence of operation: power up
Completing Self Test
(15 Seconds)
Apply
Control
Power
Starting Application
(15 to 30 Seconds)
Last Mode
i.e. Auto
or Stopped
as Shown
Self Test
Starting Application
