Specifications

69
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
8
HISTORY KEY
History Key Operation
The HISTORY key provides the user access to many
unit and system operating parameters captured at the
instant a unit or system safety (fault) shutdown occurs.
The history buffer will also capture system data at the
time of normal shutdowns such as cycling shutdowns.
When the HISTORY key is pressed the following screen
is displayed:
HISTORY CHOOSE HISTORY TYPE
< > FAULT SHUTDOWNS
The ◄ and ► (ARROW) keys allow choosing between
NORMAL SHUTDOWNS and FAULT SHUTDOWNS.
“Fault” shutdowns provide information on safety
shutdowns, while “Normal” shutdowns provide chiller
cycling information on temperature (demand), cycling,
remote, system switch, etc., shutdowns that are non-
safety related shutdowns. Once the selection is made, the
 (ENTER) key must be pressed to enter the selection.
Normal Shutdowns History
If the NORMAL SHUTDOWNS History is selected, the
following screen will be displayed:
NORM HIST XX 01-JAN-2010 12:00:00 AM
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
XX is the normal shutdown number. The display will
provide date and time of the shutdown and the reason for
the cycling shutdown (YYY…).
The operator can view any of the stored 20 single
display normal shutdown history buffers. History
buffer number 1 provides the most recent shutdown
information and buffer number 20 is the oldest safety
shutdown information saved. The ◄ and ► (ARROW)
keys allow scrolling between each of the history buffers.
The ► (ARROW) key scrolls to the next normal history
shutdown and the ◄ (ARROW) key scrolls to the previous
normal history shutdown.
The following display will typically be displayed on a
normal shutdown due to shutdown on lack of cooling
demand.
NORM HIST XX 01-JAN-2010 12:00:00 AM
SYS 1 COOLING DEMAND SHUTDOWN
Fault Shutdowns History
If the FAULT SHUTDOWNS History is selected, the
following screen will be displayed:
FAULT HIST 1 01-JAN-2010 12:00:00 AM
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
XX is the FAULT HISTORY shutdown number. The
display will provide the date, time, and a description of
the specific type of fault that occurred (YYY...).
The operator can view any of the stored 10 fault history
buffers. History buffer number 1 provides the most
recent safety shutdown information and buffer number
10 is the oldest safety shutdown information saved. The
◄ and ► arrow keys allow scrolling between each of the
FAULT HIST buffers 1 through 10. The ▲ (UP) and ▼
(DOWN) arrow keys can be used to scroll forwards and
backwards through the data in a specific history buffer,
once it is displayed.
There is a large amount of data provided under each
history. Rather than scroll sequentially through the data
in a history, which is possible using the ▼ arrow key,
the use of a combination of the ◄, ►, ▲‚ and ▼ arrow
keys allows fast scrolling to specific data the user desires
to view. To use this feature, the user needs to be aware
the ◄ and ► arrow keys allow scrolling to the top of
the data subgroups. Once a specific history is selected,
the history data is divided under the subgroups of Unit
Data, VSD Data, System Data, Hours/Starts, Setpoints,
Options, and Program data. The ◄ and ► arrow keys
allow moving to the first display under the next or
previous subgroup at any time. Once the first display
of a subgroup is displayed, the ▲‚ and ▼ arrow keys
allow scrolling though the data in the subgroup. The ▼
arrow key allows scrolling though the data from first to
last. When the last piece of data is displayed, the next
press of the ▼ arrow key scrolls to the first piece of data
in the next subgroup. The ▲ arrow key allows going to
the previous display.
Listed below is a description of the fault data displays
and their meaning. Data will be displayed in a specific
order starting with the Status Display (System Faults
only), Fault Display, All Fault Display, Unit Data, VSD
Data, System Data, Operating Hours/Starts, Setpoints,
Options, and Program Values at the time of the fault.