REGARD mA output module. Installation, operation and maintenance

Transcription

1 REGARD mA output module Installation, operation and maintenance Issue 1 November 2006

2 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 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. 2 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 mA output module will not work with Regard 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. Issue 1 November

4 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) 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. 4 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: Link on position 9-16: Issue 1 November

6 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 signal from all or some outputs; green LED is lit. Output constant approx. 1mA Output constant but gas level display changing Output current too low or will not reach 20mA Red LEDs unlit or permanently lit No DC supply to module Faulty module No signal from input modules Wrong channels selected on 4-20mA module No signal from input module(s) Fault on output module. Connect system ribbon cable to module Replace module Check input modules Check position of Channels link Press Acknowledge Check connection to input module(s) If fault persists then replace module. System in inhibit Return Inhibit switch to position 0 Load resistance too high Fault on output module or input or relay modules Reduce load resistance Check all modules 6 Issue 1 November 2006

7 SPECIFICATIONS Output range ma Isolation 50 V Cable cross-section 0.5 to 2.5 mm 2 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 mA output module manual (English) mA output module manual (German) The Regard mA output module will not work with Regard Issue 1 November

8 Draeger Safety UK Ltd Riverside Business Park Blyth, Northumberland NE24 4RG United Kingdom Tel Fax Manual part number Issue 1 November 2006