YORK INTERNATIONAL
78
FORM 150.62-NM7 (103)
HISTORY DISPLAYS
The HISTORY key gives the user access to many unit
and system operating parameters at the time of a unit
or system safety shutdown. When the HISTORY key is
pressed the fol low ing message is displayed.
While this message is displayed, the UP arrow key 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 se lect ing the shutdown number, press ing the EN-
TER key displays the following message which shows
when the shut down occurred.
Pressing the DOWN arrow key repeatedly from the
DIS PLAY SAFETY SHUTDOWN NO. X displays the
soft ware version.
The version shown below is only an exam-
ple. The EPROM's for the YCAL0043-0253
and YCAL0287-0377 each have their own
part and version number.
HISTORY PRINTOUT
Pressing the PRINT key and then the HIS TO RY key
al lows the operator to obtain a printout of information
re lat ing to the last 6 Safety Shutdowns which oc curred.
The in for ma tion is stored at the instant of the fault, re-
gard less of whether the fault caused a lockout to occur.
The information is also not affected by power failures
(long-term internal memory bat tery backup is built into
the circuit board) or manual re set ting of a fault lock-
out.
When the HISTORY key is pressed, a printout is trans-
mit ted of all system operating conditions which were
stored at the “instant the fault occurred” for each of the
6 Safety Shut downs buffers. The printout will be gin with
the most recent fault which oc curred. The most recent
fault will always be stored as Safety Shut down No. 1.
Iden ti cal ly for mat ted fault in for ma tion will then be print ed
for the re main ing safety shut downs.
Information contained in the Safety Shut down buffers is
very im por tant when at tempt ing to trou ble shoot a sys tem
prob lem. This data refl ects the system con di tions at the
instant the fault oc curred and often re veals other system
con di tions which actually caused the safety thresh old
to be exceeded.
The history printout is similar to the operational data
printout shown in the previous section. The dif fer enc es
are in the header and the sched ule in for ma tion. The
dai ly schedule is not printed in a history print.
One example history buffer printout is shown following.
The data part of the printout will be exactly the same as
the op er a tion al data print so it is not repeated here. The
dif fer ence is that the Daily Schedule is not print ed in the
S H U T D O W N O C C U R R E D
0 3 : 5 6 P M 2 9 J A N 0 2
D I S P L A Y S A F E T Y S H U T-
D O W N N O . 1 ( 1 T O 6 )
Unit Controls
S O F T W A R E V E R S I O N
C . M M C . 0 4 . 0 1
YORK INTERNATIONAL COR PO RA TION
MILLENNIUM LIQUID CHILLER
SAFETY SHUTDOWN NUMBER 1
SHUTDOWN @ 3:56PM 29 JAN 02
SYS 1 HIGH DSCH PRESS SHUT DOWN
SYS 2 NO FAULTS
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