SMC sierra monitor corporation Sentry Instruction Manual - Version 6
SERVICE
Page: 64
7.3.2 WARNING AND ERROR MESSAGES
7.3.2.1 SYSTEM ERRORS
If Sentry cannot operate the basic computer functions one
of the System Errors listed in Table 7-1 will display.
These failures indicate internal controller problems which
are most likely to require board level repairs by the
factory.
7.3.2.2 TROUBLE CONDITIONS
The following "Trouble Conditions" require operator
corrective action.
DISCONNECTED: The controller is not able to
communicate with the module
CHECK POWER ADJ A hydrogen sulfide sensor heater
is not functioning. Current drops
to zero or voltage increases to
maximum.
MODULE VOLT LOW The module voltage is too low
(<11.5V). This indicates there is
an excessive drop in the line
from the controller to the
module.
SENSOR FAILURE Sensor signal voltage is out of
limits.
DUPLICATE MODULE A response to one address
number has been received on
two channels.
CHK BRIDGE VOLTAGE The bridge voltage on a
combustible sensor is out of
limits.
TYPE ERROR The module which responded is
a different type than previous
response.
When any of these conditions are identified the controller:
• activates the trouble relay and trouble light
• displays an "E --” beside the corresponding
module number (i.e.: "1E --")
• describes the error condition on the lower
display, and
• logs the error in history memory for later recall
via the keyboard or printer.
NOTE
Trouble conditions logged into memory are erased by the
Reset System command. All other erasable History is
cleared by the Reset History command.
All other modules on the channel and modules on other
channels remain in full operation and continue to be
scanned by the controller. If the problem is corrected, the
trouble light and relay will turn off and the module will be
brought back on line after a warm-up period.
7.3.2.3 WARNING AND STATUS
The warning and status messages are displayed when valid
and do not log to history.
7.3.3 WARM-UP TIMERS
Three “timers” are used by Sentry to delay bringing the
system or parts of the system on-line during a stabilization
period. These timers can be cleared via the diagnostic
code “0000” described in Appendix C.
• SYSTEM WARM-UP: After any loss of power (AC
& DC) Sentry will count down a five minute
system warm-up. During this period the
modules will be under power but will not be
displayed, nor will their output be used to
determine a gas concentration.
• MODULE WARM-UP: Any module which has
been disconnected, or has just been
“recognized” by the controller will be held in a
module warm-up delay for a period of five
minutes before being displayed as “on line”.
• CALIBRATION DELAY: Immediately after
calibration each module is held in a calibration
delay which is similar to the module warm-up.
Although the controller display indicates
CALIBRATION COMPLETE/PLEASE WAIT if the
system is reset, each applicable module will be
indicated as MODULE WARM-UP.
7.3.4 ACCESS CODES
Sentry software allows users to establish user codes which
restrict access by unauthorized users to critical parameters
or functions. (See Section 8.3).
7.3.5 DIAGNOSTIC CODES
Diagnostic codes allow the technician to use the system
software to collect diagnostic data for use in system
check-out. Diagnostic code assignment is described in
Section 8.3.5.