Sentry Industries 5000 User Manual

 

 

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. 

The following "Trouble Conditions" require operator 
corrective action. 

: 

The controller is not able to 
communicate with the module 

A hydrogen sulfide sensor heater 
is not functioning.  Current drops 
to zero or voltage increases to 
maximum. 

 

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 signal voltage is out of 
limits. 

 

A response to one address 
number has been received on 
two channels.  

  The bridge voltage on a 

combustible sensor is out of 
limits.  

 

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 "

” beside the corresponding 

module number (i.e.: 

) 

• 

describes the error condition on the lower 
display, and 

• 

logs the error in history memory for later recall 
via the keyboard or printer. 

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. 

The warning and status messages are displayed when valid 
and do not log to history. 

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. 

• 

 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. 

• 

  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”.  

• 

  Immediately after 

calibration each module is held in a calibration 
delay which is similar to the module warm-up.  
Although the controller display indicates 

 if the 

system is reset, each applicable module will be 
indicated as 

 

Sentry software allows users to establish user codes which 
restrict access by unauthorized users to critical parameters 
or functions.  (See Section 8.3). 

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.