Sentry Industries 5000 User Manual

 

 

Action: check fuse F2 on power supply board.  If power 

supply jumpers have been cut, cold start requires 110 
VAC. 

The +24 volts can be measured at TP1 or TP2 (Test Point 1 
or 2) with respect to ground (GT1). Figure 7-3.  If there is no 
+24 volts  and replace fuse F1 

The +5 volts can be measured at TP4  If there is no +5 volts 
check and replace fuse F3. 

The +15 volts can be measured at TP5. 

The -12 volts can be measured at TP7 

The lithium battery which is located on the main control 
board,  Figure 7-2, looks like a large coin and is mounted in 
a round battery holder with a metal retaining clip.  Typical 
battery voltage should be 3.0 volts and can be measured by 
connecting the negative lead of the meter to Ground Test 1 
(GT1) on the main control board, and the positive lead to the 
shoulder of the battery holder arm.  The voltage should be 
greater than +2.2 volts or the battery should be replaced. To 
remove the battery (use Panasonic BR2325 or equal) use a 
nonmetallic probe to carefully lift the metal clip and push the 
battery to one side. 

It is advisable to increase the tension on both the positive 
and negative contacts before installing the new battery.  To 
do this slide an insulator between the contacts and use a 
small screwdriver to lift the lower contact up and push the 
upper contact down.  Install the new battery with the positive 
terminal ("+") facing up.  The insulator is important to avoid 
shorting the two terminals as this will erase the data 
accumulated in RAM. 

Battery replacement is necessary when the  REPLACE 
BATTERY message appears on the lower display during 
normal operation. The controller memory of factors, 
calibration and history will be retained for a period of several 
minutes during battery replacement. 

There is one EPROM located on the main control board. 
Figure 7-2.  The EPROM can be identified by the white label 
on the window.  The EPROM stores all the software for 
Sentry.  The EPROM needs  replacement when the user 
wishes to upgrade to additional options or when a factory 
upgrade is issued for the system.  The following precautions 
must be exercised when replacing the EPROM: 

• 

EPROM’

S

 are sensitive to static discharge and 

extreme care must be used in their handling.  The 
technician should be grounded before picking up 
or installing EPROM’

S

. 

• 

Always remove power to the controller before 
removing or installing EPROM’

S

. 

• 

Before installing check each EPROM for bent 
pins. 

• 

Insure that pin orientation is correct, pin 1 toward 
center of controller. 

• 

After installation clear RAM using diagnostic 
code 0099.  (See Section 8.3.5) 

• 

If there is a problem with the EPROM, the display 
will read an "E-01" error.  This is usually a result 
of an improperly installed EPROM. 

There are eight regulated power supplies on the main control 
board.  The regulators supply power to the module channels.  
The voltages which can be measured between the power and 
ground connectors of any channel  should be between +20.5 
and +19.0 volts with no  sensor modules connected to any 
channel.  If the channel voltage is greater than +21 volts that 
channel should not be used.  

The alphanumeric display is the lower display on the front 
panel.  The viewing angle can be altered via the display angle 
adjustment potentiometer located on the side of the display 
panel.  To access the adjustment slide the left panel back and 
use a small screwdriver on the only visible potentiometer on 
the front panel assembly.  

The three socketed DPDT 3 Amp dry contact relays are on 
the main control board Figure 7-2.  The relay function can be 
tested using the TEST ALARMS function of the controller 
which causes each relay to throw during the time the 
respective display is indicated on the front panel. 

It is important that replacement relays be installed in the 
same orientation; pin 1 of the relay must line up with pin 1 
of the socket.