56
YORK INTERNATIONAL
downs which occurred. The information is stored at the
instant of the fault regardless of whether the fault caused
a lockout to occur. The information is also not affected
by power failures (long term internal memory battery
back-up is built into the circuit board) or manual resetting
of a fault lock-out.
When the HISTORY key is pressed, a Printout is trans-
mitted of all system Operating conditions which were
stored at the instant the fault occurred for each of the 3
SAFETY SHUTDOWN BUFFERS. There is one buffer
(storage area) for data related to each of the last 3 safety
shutdowns.
The printout will begin with the most recent fault which
occurred. The most recent fault will always be stored as
SAFETY SHUTDOWN NO. 1 (See printout Fig. 21).
Identically formatted fault information will then be printed
for SAFETY SHUTDOWN NO. 2 and SAFETY SHUT-
DOWN NO. 3.
Information contained in the SAFETY SHUTDOWN Buff-
ers is very important when attempting to troubleshoot a
system problem. This data reflects the system condi-
tions at the instant the fault occurred and often reveals
other system conditions which actually caused the
safety threshold to be exceeded. (See Fig. 21)
FIG. 21
HISTORY PRINTOUT
NOTE: In actual printouts, this would be one continuous printout.
LD02177
Summary of Contents for YCAJ44HE8
Page 16: ...16 YORK INTERNATIONAL WIRING DIAGRAMS LD02165 FIG 5 ELEMENTARY DIAGRAM...
Page 17: ...FORM 150 60 NM3 17 YORK INTERNATIONAL FIG 5 ELEMENTARY DIAGRAM Cont d LD02166...
Page 20: ...20 YORK INTERNATIONAL CONNECTION DIAGRAM ELECTRICAL BOX FIG 7 CONNECTION DIAGRAM LD02171...
Page 21: ...FORM 150 60 NM3 21 YORK INTERNATIONAL FIG 7 CONNECTION DIAGRAM Cont d LD02172...