3M GD-6 manual Wwarning, Power Up, Operation, Default Configuration - Factory Settings

Typical Connection to the 3M™ Macurco™ Detection and Ventilation Control Panel DVP-120

Gas detection and exhaust fan control is provided by a 3M™ Macurco™ DVP-120 system. This System will use the GD-6 Combustible Gas to current transducer, Nitrogen Dioxide to current transducers or Carbon Monoxide to current transducers. Each transducer will measure the level of the target gas and provide this information to the DVP-120 over a 4-to-20mA current loop.

All power and signal connections for the transducers are provided from the DVP-120 control panel, via unshielded four conductor cable. The DVP-120 control panel provides three relays which can be used for ventilation fan control or alarm signaling. These relays (SPDT-Form C) are for pilot duty only, capable of switching 10 amps loads up to 240VAC.

NOTE:

1. Power connections at the sensor are non-polarized.

	GD-6				GD-6
power			output	power			output
		– +				– +

Power Up

WWARNING

Each time the unit is turned on it performs a self-test, which activates visual alarms. If the self-test fails, or if all the alarms do not activate, do not use. Failure to do so may adversely affect product performance and result in sickness or death.

The 3M™ Macurco™ GD-6 Combustible Gas Detector cycles through an internal self-test cycle for the first minute that it is powered. The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the firmware version number, then count down from 60 to 0 and finally go into normal operation. The fan and alarm relay will be activated for the power-up cycle unless the “Power Up Test” (PUt) option is OFF. The indicator light (LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of the air and

Exhaust Fans

120VAC

ALARM

120VAC

Power

Main Fan Power

coil

coil

STARTER RELAYS

120VAC COILS

8	7	6	5	4	3	2	1
24 V RET	-1 LOOP	+1 LOOP	+24 VDC	24 V RET	-1 LOOP	+1 LOOP	+24 VDC
							- Strobe	4
3M™ MACURCO™							+ Strobe	3
DETECTION AND VENTILATION							- Horn	2
CONTROL PANEL DVP-120
							+ Horn	1
			Relay 1		Relay 2		Relay 3

Panel Power

Gnd 120/250VAC

N	L	N.C.	N.O.	COM	N.C.	N.O.	COM	N.C.	N.O.	COM
1	3	1	2	3	4	5	6	7	8	9

the light will turn solid green.

WWARNING

Do not cover or obstruct visual alarm LED. Doing so may adversely affect product performance and result in sickness or death.

Operation

1.With the display function turned “On”, the 3M™ Macurco™ GD-6 Combustible Gas Detector will show the current concentration of gas % LEL or “0” (zero) in clean air. When the gas concentration reaches the Fan Relay setting (10% LEL, for example) the display will flash back and forth between “FAn” and “10”. With the display function turned ”Off”, the display does not show the gas concentration, but will show “FAn” as long as the fan relay is activated.

2.With the display function turned “On” and the gas concentration reaching the alarm relay setting, (20% LEL, for example) the display will flash back and forth between “ALr” and “20”. The buzzer will sound indicating “Alarm” if the buzzer is turned “On”. With the display function turned off the display does not show the gas concentration, but will show “ALr” when the Alarm relay is activated.

3.With the 4-20mA function turned “On”, the 4-20mA output will correspond to the concentration (0-50% LEL). The display will show “FAn” and “ALr” and sound as outlined above.

Default Configuration – Factory Settings

•The default Display setting is Off

•The default Power Up Test setting is On

•The default Buzzer setting is Off

•The default Alarm Relay setting is activation at 20% LEL

•The default Fan Relay Delay setting is 3 minutes

•The default Fan Minimum Runtime setting is OFF

•The default Fan Relay setting is activation at 10% LEL

•The default Alarm Relay Configuration is Normally Open

•The default 4-20mA Output setting is OFF

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