SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

7.2 CONTROLLER

7.2.1 MECHANICAL/FUNCTIONAL DESCRIPTION

The controller consists of four sub assemblies. Figure 7-1.

7.2.1.1CONNECTOR PANEL

The Back Panel contains all the connectors for providing system power, powering and communicating with the modules, operating alarm devices and communicating with a printer. The panel also contains the AC fuse.

The connector panel contains, internally, an edge card connector which connects the main control card.

To remove the panel from the controller unscrew the four corner screws and gently slide the edge connector apart. This procedure allows the controller to be removed for repair without disconnecting all the wiring from the connector panel.

Except for the AC fuse there are no field repairable components on the connector panel.

7.2.1.2 POWER SUPPLY ASSEMBLY:

The power supply assembly includes the transformer which is installed on the bottom plate of the controller and the power supply board which is "piggy backed" to the main control board. To gain access to the power supply board remove the six screws which hold the perforated side panel on the left side of the controller and slide the panel off toward the connector panel.

The power supply board provides various DC voltages for system operation and is described in Section 7.2.2

To remove the power supply board unplug the large in- line harness connector, remove the four nuts from the corners of the board, and lift the board off the multi-pin connectors which interface the power supply to the main control board.

7.2.1.3 MAIN CONTROL BOARD

The main control board assembly is a printed circuit board which connects to the connector panel and the power supply as described above and to the front panel via a ribbon cable. To access the component side of the board remove the perforated side panel on the right side of the controller.

Field repairs to the main control board involve socketed component replacement only. Board removal is not required for these repairs.

7.2.1.4FRONT PANEL

he front panel assembly contains the membrane panel, the two displays and the indicator lights (LED's). A ribbon cable connection to the main control card is the only electrical connection to the panel.

Access to the lower display angle adjustment is by removal of the left side panel.

7.2.2 ELECTRICAL DESCRIPTION

7.2.2.1 POWER SUPPLY DESCRIPTION

The controller power supply is configured to accept 120 VAC and/or 12 VDC. See specifications Section 8.1 for specific requirements.

The controller can also accept +10 to +29 VDC. If both AC and DC supplies are connected and the AC drops below 90 VAC the system will operate on DC until that supply drops below 10.5 VDC. At that time the controller will reset.

The power supply provides a regulated +24 to +26 volts for the channel regulators, +5 volts for the main control card and front panel board, and +15 & -12 volts for the main control card. A 1 Amp (120 VAC) or .5 Amp (220 VAC) slo-blow fuse protects the AC input power. Check the fuse on the connector panel if the power light is off. - Figure 3-9

The power supply is protected by an over-voltage transient protector (MOV), an EMI/RFI line filter and Zener transient protectors.

The following are symptoms of power supply failure. Figure 7-3.

1.No +24 volts: no modules recognized by the system.

Action: check the fuse on the connector panel, check that the 9 pin in-line connector is fully seated. If the +24 volts is still absent, replace the power supply board. (The failed board can be factory repaired.)

2.No +5 volts: no lights or displays on the front panel. Action: check fuse F1 on power supply board.

3.No +15 volts: no modules recognized by the system & no bottom display.

Action: replace power supply board.

4.No -12 volts: no lower display and/or no modules recognized, no printing and no alarm functions.

Action: replace power supply board.

5.No +12 volts with battery back-up: no lights on front panel.

SERVICE Page: 58

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Sentry Industries 5000 Controller MECHANICAL/FUNCTIONAL Description, Connector Panel, Power Supply Assembly, Front Panel

5000 specifications

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