Dräger REGARD 4208797 Montage- und Bedienungsanleitung

Issue 1 – November 2006

REGARD 3900

4-20mA output module

Installation, operation and maintenance

2 Issue 1 – November 2006

FOR YOUR SAFETY

Follow the instructions

Read this manual before installing the module.

Maintenance

The equipment must be inspected and serviced regularly by trained personnel. Keep

a record of inspections and servicing.

Repairs of this equipment should only be carried out by competent personnel.

We recommend that either a training course or service contract is obtained from

Draeger and that all repairs are carried out by them.

If the system is being used to monitor flammable gases/vapours and/or oxygen, refer

to EN 50073 and/or local regulations.

Not for use in areas where explosion hazards are possible

This equipment is not approved or certified for installation in potentially explosive

atmospheres.

Liability for proper function or damage

Liability for proper function of the equipment is irrevocably transferred to the owner or

operator to the extent that the equipment is serviced or repaired by personnel not

employed or authorised by Draeger, or if the equipment is used in a manner not

conforming to its intended use.

Draeger Safety UK Limited can not be held responsible for any damage caused by

non-compliance with the above recommendations. The warranty and liability

provisions of the terms and conditions of sale and delivery of Draeger Safety UK

Limited are likewise not modified by the recommendations given above.

Issue 1 – November 2006 3

INTENDED USE

•For remote indication or recording of gas levels.

•Not for control of counter-measures against risk of explosion. The 4-20mA output

module is not included in the scope of the Regard 3900 ATEX EC-type

examination.

The module must be mounted within the Regard 3900 control unit enclosure. Up to

four modules can be installed if there is space in the enclosure.

•Do not mount the module outside the 3900 enclosure.

•Do not extend the 3900 ribbon cable or use a longer ribbon cable, in order to

install output modules remote from the input module(s).

The module can be used in Regard 3910 systems. Do not exceed 2m ribbon cable

length.

The Regard 3900 4-20mA output module will not work with Regard 3800.

DESCRIPTION

The module has eight outputs, electrically isolated from the Regard 3900 system.

Each output is a current source and will only work when connected to a passive load.

Each output has two terminals:

+ output

– module 0V

The module’s 0V is isolated from the Regard 3900 system 0V.

Each output supplies a 4..20mA signal proportional to the gas level for its

corresponding input channel. The module’s outputs correspond to channels 1-8 or

channels 9-16 of the Regard 3900 system, depending on the position of the

Channels link on the 4-20mA output module.

The output of inactive channels is 0mA.

4 Issue 1 – November 2006

Zero clamp

Because the system’s gas level reading is clamped to zero when the gas level is

within 2% of zero, the output of the 4-20mA will also will also jump between 4.0 to 4.3

mA when the gas level varies around zero.

Example for input channel with measuring range 0 – 100:

Gas sensor input

(mA)

Regard 3900 display

reading

4-20mA module output

(mA)

4.0 0 4.0

4.1 0 4.0

4.2 0 4.0

4.3 2 4.3

12.0 50 12.0

20.0 100 20.0

Inhibit

When the Regard 3900 inhibit switch is set to position ‘1’ all 4-20mA outputs freeze

at the output level at that time the Inhibit switch is operated. When the inhibit switch

is returned position ‘0’ all outputs return to normal.

Module fault

If the 4-20mA output module has a fault all outputs on the module will jump to a

steady 1mA (±0.3mA)

LEDs

Green LED: DC power on; lit when DC supply to the module is on.

Red LEDs: diagnostics; flicker or dimly lit during normal operation.

Issue 1 – November 2006 5

INSTALLATION & CONFIGURATION

1. Fit the output module in an unused position, or on top of any existing modules, in

the 3900 enclosure using the spacers and fittings provided.

2. Connect the Regard 3900 ribbon cable to the module(s).

3. Set the Channels link on the module.

Link on position 1-8:

1 8765432

+–+–+–+–+–+–+–+–

Link on position 9-16:

6 Issue 1 – November 2006

Two or more modules can be set to the same channels (1-8 or 9-16)

4. Connect the signal outputs. Unused outputs can be left unconnected.

MAINTENANCE

Check the module for correct operation at regular intervals.

Fault finding

Fault Cause Remedy

No signal from all

outputs; green

LED not lit.

No DC supply to

module

Connect system ribbon cable to module

Faulty module Replace module

No signal from all

or some outputs;

green LED is lit.

No signal from

input modules

Check input modules

Wrong channels

selected on 4-

20mA module

Check position of Channels link

Output constant

approx. 1mA

No signal from

input module(s)

Fault on output

module.

Press Acknowledge

Check connection to input module(s)

If fault persists then replace module.

Output constant

but gas level

display changing

System in inhibit

Return Inhibit switch to position 0

Output current too

low or will not

reach 20mA

Load resistance

too high

Reduce load resistance

Red LEDs unlit or

permanently lit

Fault on output

module or input or

relay modules

Check all modules

Issue 1 – November 2006 7

SPECIFICATIONS

Output range 0.1 – 21.7 mA

Isolation 50 V

Cable cross-section 0.5 to 2.5 mm2

Resolution 0.1mA

Accuracy ± 1%

Maximum load 500 ohms

Operating temperature range 0 to 55 C

Storage temperature range -25 to +70 C

DC input voltage 18 to 30V DC

Power / current consumption Approx. 7W / 300mA at 24V

Part numbers

Description Part number

4-20mA output module 4208797

4-20mA output module manual (English) 4208839

4-20mA output module manual (German) 4208840

The Regard 3900 4-20mA output module will not work with Regard 3800.

8 Issue 1 – November 2006

Draeger Safety UK Ltd

Riverside Business Park

Blyth, Northumberland

NE24 4RG

United Kingdom

Tel +44 1670 352891

Fax +44 1670 356266

Manual part number 4208839

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