SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

Connect the necessary remote audible and visual alarms or other process control equipment to the

"HIGH", "LOW" and "TROUBLE" dry contact relays on the connector panel.

The Double Pole/Double Throw (DPDT) relay connections are marked to indicate Normally Open (N/O) , Normally Closed (N/C) and Common (COM) terminals for each pole. No voltage is applied to the terminals internally.

Typical wiring configuration is described in Figure 3-11. The trouble relay is fail safe so that it will switch from Normally Closed to Normally Open if all system power is lost.

NOTE

It may be preferably to delay wiring the alarms, or delay powering them, until the detection system has been fully activated, tested and calibrated.

Connect 120 volts AC wiring to the terminals marked Hot (black), Neutral (white), and Ground (Green).

If a 12-28 VDC supply is to be used as either back-up or as the primary operating voltage make the necessary connections to the terminal marked "DC INPUT 12 - 28V" "+" (Red) & "-" (Black).

NOTE

When a battery is to be used for back-up DC supply only,

a Sentry feature provides protection against battery damage by shutting off the battery before complete discharge. When this feature is used, the Sentry controller can only be restarted by AC voltage.

To implement the battery protection feature, two red

jumper wires located on the power supply board must be

cut. See Figure 7-3.

If splice boxes are used to combine multiple modules on a channel the splice connections should be made using a terminal block/wire lug assembly or all wires should be soldered and insulated. Figure 3-5.

3.5.3 ALARM DEVICE INSTALLATION

Alarm devices must be installed according to the manufacturer's instructions for the particular device. Sentry dry contact relays provide switching capability as rated in the specifications. (See Appendix A.)

NOTE

Certain warning strobes have a very high peak current which is dependent upon the phase angle of the AC line at the precise moment the strobe is switched on. A high current at the time of switching may cause the relay contacts to stick together.

The corrective action to avoid contacts sticking together is

to install a 10 Ohm, 5 Watt resistor in series with the

strobe power, preferably close to the relay.

3.5.4 RELAY OUTPUTS

Three relays on the standard Sentry controller are for: high alarm, low alarm and trouble. The trouble relay is normally energized (power applied to coil). The gas alarm relays (high and low) are normally not energized. Individual low and high alarm relays are optional hardware.

NO

RELAY

MOV

 

COM.

Install MOV

 

110 VAC

close to switch

NO

 

 

RELAY

1N4005

 

 

 

COM.

 

Install diode

+

-

close to load

 

DC

 

 

Figure 3-1

Typical Protection Circuit

The relays are dry contact and may be used to actuate bells, lights, sirens, solenoid valves, or contactors as required. It is recommended that for 120 VAC circuits a metal oxide varistor (MOV) rated for 150 Vrms be place across the load (Figure 3-1). (General Electric V150LA20A or equivalent). For DC circuits a general purpose rectifier diode should be placed across the load (1N4005).

3.5.5 DC POWER LOAD

Table 3-7 is provided to allow correct sizing of battery back-up. To determine total load add the applicable individual loads. (All measurements are at 12 VDC.)

Test Condition

Amps

Watts

 

 

 

Controller, No Sensors, No Alarms

0.560

6.7

Controller, No Sensors, All Alarms

0.660

8.0

Controller, 8 Combust, All Alarms

4.000

48.0

Individual Relay Board

0.750

9.3

Hydrogen Sulfide (Type 1) Module

0.260

3.1

Combustible (Type 2) Module

0.420

5.0

Electrochemical Sensor (typical)

0.050

0.6

Table 3-7

Sentry Power Load

INSTALLATION

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Sentry Industries 5000 instruction manual Mov, Install MOV, Typical Protection Circuit, Sentry Power Load

5000 specifications

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