Enmet ISA-RAL-M Bedienungsanleitung PDF herunterladen (Seite 7)

ISA-RAL-M, ISA-RAH-M ENMET Corporation

3.2 Internal Electronic Circuitry

Figure 5 shows the circuit board and terminal blocks housed inside the hinged oiltight control unit. Specific relays and

adjustments are defined:

Internal Relay Contacts Relays can be used to activate an external remote alarm signal when a

hazardous CO level is detected, or when the ac or dc power is interrupted.

These are double-pole relays with terminals normally open, normally closed

and common (see Figure 3 for relay contact hook-up). There is one relay for

each alarm level.

Potentiometers: The unit has five potentiometers. Only 3 are used by the customer. These vary

critical circuit resistances and are essential to calibration procedures. These

potentiometers are described below.

Meter Adjust To adjust and set the meter for appropriate gas response during calibration.

Low Level Set To adjust the trip level of the amber gas alarm light and the audio alarm.

High Level Set To adjust the trip level of the red gas alarm light and the audio alarm.

Figure 3: Utilizing the Relay Contacts

Figure 5: Internal Electronic Circuitry

Normally

Closed

Contact

Common

Contact

110 Vac

Power supply Outside

of Control Unit

Manual On/Off

Switch

Horn

White

Black

Non-Latching Relay contacts:

Identified below is the non-powered

(power to unit is off), alarm positions of

the non-latching relay contacts.

Terminal Block 2 see Figure 5

Relay 1 High Alarm

Relay 2 Low Alarm

NOTE: N.C.= normally closed

N.O.= normally open

Suggested wiring configuration for Utilizing Relay Contacts

(manual on/off switch is suggested; user supplied component)

Low Level Set

Potentiometer

High Level Set

Potentiometer

Meter Adjust

Potentiometer

110 / 115

210 / 230*

*See Section 4.0

12 VDC

INPUT

Internal Relay

Contacts

Red Lamp----

Green Lamp

Amber Lamp

Purge

GND

Meter+

Meter–

TB3

TB2

TB1

Relay 1

GND

Battery

Backup

GND

Signal

Heater

Sensor

COM.

N.C.

COM.

N.O.

N.C.

Relay 2

TB4

GND

110 VAC

RV34

RV32

RV38

RV35

TP1

RV33

Jumper Holder

Jumper 1

Jumper 2

Jumper 5

Jumper 4

Jumper 3

TP2

1 2 3 4 5 6 7 8 9 10 11 12 ... 21 22

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