MiCOM P921/P922/P923 - Schneider - error

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P92x/EN GS/F22Page 4/22Getting StartedMiCOM P921/P922/P9232. HANDLING OF ELECTRONIC EQUIPMENTA person’s normal movements can easily generate electrostatic potentials of severalthousand volts. Discharge of these voltages into semiconductor devices when handlingelectronic circuits can cause serious damage, which often may not be immediately apparentbut the reliability of the circuit will have been reduced.The electronic circuits are completely safe from electrostatic discharge when housed in thecase. Do not expose them to risk of damage by withdrawing modules unnecessarily.Each module incorporates the highest practicable protection for its semiconductordevices. However, if it becomes necessary to withdraw a module, the followingprecautions should be taken to preserve the high reliability and long life for which theequipment has been designed and manufactured.1. Before removing a module, ensure that you are at the same electrostatic potential asthe equipment by touching the case which is connected to the protective conductorterminal.2. Handle the module by its front plate, frame or edges of the printed circuit board. Avoidtouching the electronic components, printed circuit track or connectors.3. Do not pass the module to another person without first ensuring you are both at thesame electrostatic potential. Shaking hands achieves equipotential.4. Place the module on an antistatic surface, or on a conducting surface which is at thesame potential as yourself.5. Store or transport the module in a conductive bag.If you are making measurements on the internal electronic circuitry of an equipment inservice, it is preferable that you are earthed to the case with a conductive wrist strap. Wriststraps should have a resistance to ground between 500kΩ – 10MΩ.If a wrist strap is not available you should maintain regular contact with the case to prevent abuild-up of static. Instrumentation which may be used for making measurements should beearthed to the case whenever possible.More information on safe working procedures for all electronic equipment can be found inBS5783 and IEC 147-OF. It is strongly recommended that detailed investigations onelectronic circuitry or modification work should be carried out in a special handling area suchas described in the above-mentioned BS and IEC documents.
Getting StartedP92x/EN GS/F22MiCOM P921/P922/P923 Page 5/223. RELAY MOUNTINGRelays are dispatched either individually or as part of a panel/rack assembly.If an MMLG test block is to be included it should be positioned at the right-hand side of theassembly (viewed from the front). Modules should remain protected by their metal caseduring assembly into a panel or rack.For individually mounted relays an outline diagram is supplied in chapter 2 of this TechnicalGuide showing the panel cut-outs and hole centres.
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InstallationP92X/EN IN/F22MiCOM P92
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