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MicroPanel Contents
4.5
HISTORY KEY
If a safety shutdown occurs on the chiller, a compre-
hensive list of operating and programmed settings data
is stored by the microprocessor. The information is
stored at the instant of the fault, regardless of whether
the fault caused a lockout to occur. This information is
not affected by power failures or manual resetting of a
fault lockout.
The microprocessor stores data for up to 6 safety shut-
downs on 2 System units and 4 safety shutdowns on 3
or 4 compressor units. Once this limit is reached, a fur-
ther shutdown will cause the oldest set of data to be
discarded in favor of storing the new shutdown data.
The Safety Shutdowns are numbered from 1 to 6 with
number 1 always being the most recent.
If a remote printer is not connected, pressing the His-
tory key allows the operator to locally scroll through
information relating to the stored safety shutdowns on
the control panel display.
If a remote printer is connected, pressing the History
key will cause data from the last 6 shutdowns on a 2
compressor chiller or 4 shutdowns on a 3 or 4 compres-
sor chiller to be transmitted from the microprocessor to
the remote printer. The printout will begin with the most
recent fault which occurred. This does not affect the
stored data and as many prints as desired may be taken.
See Section 4.7 for a HISTORY printout sample.
4.6
FAULT HISTORY DATA –
LOCAL DISPLAY MESSAGES
YCAS 2 SYSTEM MODELS:
When the History key is pressed, the following mes-
sage will appear:
D I S P L A Y
S A F E T Y
D O W N
N O . 1
To select a Safety Shutdown, press the appropriate key
on the numeric key pad then press Enter. Remember
that the most recent fault information is stored as shut-
down No. 1. After the ENTER Key is pressed, a mes-
sage indicating the time and date of the Fault Shutdown
will appear:
S H U T D O W N
5 : 5 9 A M
2 9
164
S H U T -
( 1
T O
6 )
O C C U R R E D
N O V
9 8
Repetitively pressing the áâ Keys allows scrolling
through the information available in the Safety Shut-
down buffer. This is divided into Common (Whole
Chiller) Data and Individual System Data displays as
follows:
Common Data:
S Y S
1
N O
F A U L T S
S Y S
2
H I G H
This message indicates the fault that caused the shut-
down; in this case, a high motor current in System 2
was the cause of the shutdown.
S 1 - 1
C H I L L E D
W A T E R
This message displays the type of chilled liquid selected
(water or glycol) at the time of the fault.
S 1 - 2
A M B I E N T
L O W
A M B I E N T
This display indicates whether standard or low ambi-
ent operation was selected at the time of the fault.
S 1 - 3
R E F R I G E R A N T
R - 2 2
This message indicates the type of refrigerant that was
programmed at the time of the fault (R-22 or R-407C).
D I S C H A R G E
C U T O U T
=
3 9 5 . 0
This message indicates the discharge pressure cut-out
programmed at the time of the fault.
D I S C H A R G E
U N L O A D
=
3 7 5 . 0
This display provides the discharge pressure unload
point, programmed at the time of the fault.
S U C T I O N
P R E S S U R E
C U T O U T
=
4 4 . 0
This message displays the suction pressure cut-out pro-
grammed at the time of the fault.
M T R
C U R R
L I Q U I D
C O N T R O L
P R E S S U R E
P S I G
P R E S S U R E
P S I G
P S I G
YORK INTERNATIONAL
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