ROBWAY RCI-4100, Operation And Installation

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OPERATION AND INSTALLATION
RCI-4100 SYSTEM
MAN-1111 Rev H ©Copyright 2015 LSI-Robway Pty Ltd Page 76
10.3. Maintenance Work in Hazardous Areas
When the Control Unit is installed in a hazardous area it is protected by a flameproof enclosure and
must not be opened when a hazard is present. To work on the Control Unit, all power must be
removed for at least four (4) minutes before the lid can be removed. Alternatively a gas free permit
may be obtained allowing for the removal of the lid while power is still connected. The same
constraints apply to the power and motion control cabling as these are not Intrinsically Safe (I.S.)
Work external to the Control Unit should be restricted to the following:
•
Disconnection of, and removal or replacement of, items of electrical equipment and cabling
although it is recommended that power be removed from the Control Unit prior to this being
done.
•
Measurement of various parameters such as loadcell excitation voltage or resistance, or other
such maintenance activities. Note, however, that such measurements can ONLY be done with
certified test instruments (e.g. Multimeters) otherwise a gas free permit must be obtained. The
parameters that may need checking are listed in the “error/possible causes” paragraphs in the
Troubleshooting section.
It is important that the person performing the maintenance tasks ensures that the
equipment meets the requirements of the relevant documentation on completion.
10.4. Maintenance Work in Non-Hazardous Areas
There are few items in the RCI-4100IS system that are located in a non-hazardous area, these being;
•
Applications where the Control Unit is located in a safe area and contained within an enclosure
other than a flameproof enclosure,
•
Power supply for the Control Unit, and
•
The motion control solenoids or relays.
If any work is required to be done on the above items other than measurements power must be
removed from the Control Unit. Measurements made on the IS circuits in the Control Unit must only be
made with a certified test instrument if a hazard still exists on the other end of the cables. Failure to do
this may cause an ignition source to be transferred into the hazardous area from the test instrument.
Care should also be taken to ensure that safety components are not "bypassed" by the test
instrument, thus voiding the safety aspect of the Control Unit.
10.5. Modification or Repair
Repairs performed in a hazardous area are specifically discouraged by the Standard. Such repairs
should be performed away from the hazardous location.
10.6. Inspection after Maintenance
It is considered essential by the Standard that a Detailed Inspection is performed following any
maintenance to ensure that the equipment and installation continue to comply with the documentation.
10.7. Records
Ensure that that dates of all inspections, tests, maintenance, and defects are recorded.
10.8. Printed Circuit Board (PCB) Handling
If the RCI-4100 controller PCB is removed for any reason anti-static precautions must be employed.
10.9. CUFRCI4100 Flameproof Controller Mating Surfaces Precautions
The mating surfaces between housing and cover of the CUFRCI4100 flameproof controller must be
kept clean and damage free. Always ensure surfaces have thin coating of Dow Corning #4 Silicone
Grease to prevent corrosion.
NOTE: If the mating surfaces are damaged the controller must be replaced.