5.3 History Key
The 'HISTORY' key displays unit and system operating
parameters at the time of a unit or system safety
shutdown.
5.3.1 Clearing History Buffers
The history buffers may be cleared by pressing the
'HISTORY' key and then repeatedly pressing the 'UP
ARROW' key until you scroll past the last history buffer
choice. The following message will be displayed:
Pressing the 'ENTER/ADV' key at this display will cause
the history buffers to be cleared. Pressing any other key
will cancel the operation.
5.3.2 History Messages
When the 'HISTORY' key is pressed the following
message is displayed.
While this message is displayed, the 'UP ARROW' or
'DOWN ARROW' keys can be used to select any of the
six history buffers. Buffer number 1 is the most recent,
and buffer number 6 is the oldest safety shutdown that
was saved.
After selecting the shutdown number, pressing the
'ENTER' key displays the following message which
shows when the shutdown occurred.
The 'UP ARROW' and 'DOWN ARROW' keys are used
to scroll forwards and backwards through the history
buffer to display the shutdown conditions. The history
data messages are shown below in the order that they
are displayed:
1-24
Form 201.26.OI1(11/09)
INITIALIZE HISTORY
ENTER = YES
DI SPLAY SAF ET Y SHUT-
DOWN NO. 1 ( 1TO 6)
SHUT DOWN OCCURRED
11:23PM 29MAY 98
UN I T FAUL T :
LOW L I QU I D TEMP
UN I T TYPE
LIQUID CHILLER
CH I L LED L I QU I D
WA T E R
LOCAL / REMOTE MODE
LOCAL
LEAD / LAG CONTROL
AUTOMAT I C
MANUAL OVERR I DE MODE
D I SABLED
POWER FA I L RESTART
AUTOMAT I C
EXTERNAL
EVAP PUMP
For YLAA and YLAE units
YORK HYDRO K I T
PUMP = 1
Or
YORK HYDRO K I T
PUMP = 2
D I SCHARGE PRESSURE
CUTOUT = 2 5 . 7 BARG
SUCT I ON PRESSURE
CUTOUT = 3 . 0 3 BARG
LOW AMB I ENT TEMP
CUTOUT = - 1 7 . 8 ° C
LEAV I NG L I QU I D TEMP
CUTOUT = 2 . 2 ° C
LCHLT = 6 . 2 °C
SETPO I NT = 6 . 7 ° C
RANGE = + / - 1 . 1 ° C
AMB I ENT A I R T EMP
<-17.4 °C
LEAD SYSTEM I S
SYSTEM NUMBER 1
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