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Micro Panel 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. Once this limit is reached, a further 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 to be trans-
mitted 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
When the History key is pressed, the following message
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 shutdown
No. 1. After the ENTER Key is pressed, a message
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
150
S H U T -
( 1
T O
6 )
O C C U R R E D
N O V
9 8
Repetitively pressing the 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 ambient
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 R407C).
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
JOHNSON CONTROLS
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