Print Keys - York Millennium YCAS 316 Installation Operation & Maintenance

PRINT
KEYS
FIG. 31 – PRINT KEYS
GENERAL
The Print keys allow the operator to obtain two different
remote hard copy print-outs. A print-out of real-time sys-
tem operating data and a print-out of system history data
at the "instant of the fault" on each of the last three faults
which occurred on the chiller is available. These print-
outs are available by pressing the "OPER DATA" and "HIS-
TORY" keys.
If a remote printer is not being used, and the desire is to
obtain data locally at the panel, the same keys allow
access to identical real-time operating data as well as
fault information. This information is available by using a
combination of the OPER DATA and HISTORY keys in
conjunction with the ENTER key on the keypad.
An explanation of the use of the keys for remote printer
or local data retrieval will follow. An optional printer will
be required for remote printout.
REMOTE PRINTOUT
Oper Data
The OPER DATA key allows the operator to remotely
obtain a printout of current system operating parameters
114

PRINT KEYS

at the instant that the key is pressed. When the key is
pressed, a snapshot will be taken of system operating
conditions as well as all of the user programming selec-
tions. This data will be temporarily stored in memory,
after which, transmission of this data will begin to the
remote printer. As the data is transmitted from the micro-
processor to the printer, it will be erased from the memory
locations where it is temporarily stored in the micropro-
cessor. A sample printout is shown in Fig. 32.
History
The HISTORY key allows the operator to remotely obtain
a printout of information relating to the last 3 Safety Shut-
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
OPER
last 3 safety shutdowns.
DATA
The printout will begin with the most recent fault which
occurred.
28164A
HISTORY
YORK INTERNATIONAL