SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

Action: check fuse F2 on power supply board. If power supply jumpers have been cut, cold start requires 110 VAC.

7.2.2.2 POWER SUPPLY ADJUSTMENTS

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

7.2.2.3 LITHIUM BATTERY

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.

7.2.2.4 EPROM'S

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:

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.

7.2.2.5 CHANNEL VOLTAGE

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.

7.2.2.6ALPHANUMERIC DISPLAY ANGLE ADJUSTMENT

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.

7.2.2.7 RELAY REPLACEMENT

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.

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.

SERVICE

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Sentry Industries 5000 Power Supply Adjustments, Lithium Battery, Channel Voltage, Alphanumeric Display Angle Adjustment

5000 specifications

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