4.5 COMPRESSOR STATUS
As described in Section 4.1.9 there is a pair of front
panel status LED’s “Sequence” and “Loaded”, for each
compressor under the control of the ISC. Each
“Sequence” LED lights to indicate that compressor is in
Sequence mode through the communication channel to
the ISC. Each “Loaded” Led lights to indicate that com-
pressor is running loaded.
In addition, there are more detailed status messages
available through the display. Repeatedly pressing the
COMPRESSOR STATUS button will step the display
through each compressor number (#1 through the num-
ber of compressors entered during initial set up), accom-
panied by a message indicating that compressor’s sta-
tus. There are seven different status messages that can
be displayed for each compressor. The messages and
their meanings are as follows:
“#1 LOCAL” Compressor number 1 is not under
sequence control.
“#1 RUNNING Compressor number 1 is not under
LOCAL” sequence control and is running.
“#1 STOPPED” Compressor number 1 is under
sequence control and is stopped in its
auto restart mode.
“#1 RUNNING” Compressor number 1 is under
sequence control and is running.
“#1 WARNING” Compressor number 1 is in a “WARN-
ING” state defined by its own controller.
“#1 ALARM” Compressor number 1 has stopped
itself in an “Alarm” state defined by
its own controller.
“#1 COMM Compressor number 1 com-
FAILURE” munication channel has persistent
serial communication problems from
which the ISC is unable to
automatically recover.
4.6 ALARMS
The “Alarm” LED on the ISC’s front panel will light for
any one of the following three reasons.
1. Any time the ISC receives an Alarm status message
from any compressor, it turns on the “Alarm” LED and
provides the Alarm message for that particular compres-
sor as described in Section 4.5 . When the compressor’s
Alarm condition is cleared at the machine, the ISC auto-
matically turns off the “Alarm” LED and changes that
compressor’s status message accordingly.
2. Any time the ISC detects a failure to communicate
with a compressor, it turns on the “Alarm” LED and pro-
vides the Communication Failure message for that par-
ticular compressor as described in Section 4.5. When
communication is reestablished with the compressor, the
ISC automatically turns off the “Alarm” LED and changes
that compressor’s status message accordingly.
3. If the ISC determines it is no longer receiving valid
readings from its pressure transducer, it turns on the
“Alarm” LED, displays “SENSOR FAILURE” and stops all
sequencing, allowing the compressors to return to their
local controls. The ISC will stay in this state until the sen-
sor problem is corrected and the alarm is manually
cleared through the front panel. The alarm state is
cleared by pressing the SET button. To resume sequenc-
ing, the ISC must be started by pressing the
SEQUENCER START button. This is the only alarm that
will not automatically clear when the problem is correct-
ed.
The “Volt-free Alarm Contacts” on connector J1 terminals
4, 5 and 6 will activate for any compressor Alarm or for
an ISC sensor failure. The contacts reset to normal con-
dition when the Alarm is cleared per the above Alarm
LED descriptions.
The ISC software versions for which the Alarm LED and
the Alarm Contacts are active are summarized in the fol-
lowing table:
ISC Software Alarm LED Alarm Contacts
v1.0/v1.1/v1.2 Activated Activated
Any Compressor Alarm v1.0, v1.1, v1.2 v1.2
Communication Failure v1.0, v1.1, v1.2 None
ISC Sensor Failure v1.0, v1.1, v1.2 v1.0, v1.1, v1.2
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