MiCOM P921/P922/P923 - Schneider - error

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P92X/EN IN/F22Page 4/12InstallationMiCOM 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, although not always immediatelyapparent, will reduce the reliability of the circuit. This is particularly important to considerwhere the circuits use complementary metal oxide semiconductors (CMOS), as is the casewith these relays.The relay’s electronic circuits are protected from electrostatic discharge when housed in thecase. Do not expose them to risk by removing the front panel or printed circuit boardsunnecessarily.Each printed circuit board incorporates the highest practicable protection for it’ssemiconductor devices. However, if it becomes necessary to remove a printed circuit board,the following precautions should be taken to preserve the high reliability and long life forwhich the relay has been designed and manufactured.1. Before removing a printed circuit board, ensure that you are at the same electrostaticpotential as the equipment by touching the case.2. Handle analogue input modules by the front panel, frame or edges of the circuitboards. Printed circuit boards should only be handled by their edges. Avoid touchingthe electronic components, printed circuit tracks 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 anti-static surface, or on a conducting surface which is at thesame potential as yourself.5. If it is necessary to store or transport printed circuit boards removed from the case,place them individually in electrically conducting anti-static bags.In the unlikely event that you are making measurements on the internal electronic circuitry ofa relay in service, it is preferable that you are earthed to the case with a conductive wriststrap. Wrist straps should have a resistance to ground between 500kΩ to 10MΩ. If a wriststrap is not available you should maintain regular contact with the case to prevent a build-upof electrostatic potential. Instrumentation which may be used for making measurementsshould also be earthed to the case whenever possible.More information on safe working procedures for all electronic equipment can be found in BSEN 100015:Part 1:1992. It is strongly recommended that detailed investigations on electroniccircuitry or modification work should be carried out in a special handling area such asdescribed in the aforementioned British Standard document.
InstallationP92X/EN IN/F22MiCOM P921/P922/P923 Page 5/123. STORAGEIf relays are not to be installed immediately upon receipt, they should be stored in a placefree from dust and moisture in their original cartons. Where de-humidifier bags have beenincluded in the packing they should be retained.The action of the de-humidifier crystals will be impaired if the bag is exposed to ambientconditions and may be restored by gently heating the bag for about an hour prior to replacingit in the carton. For phase 1, to prevent battery drain during transportation and storage abattery isolation strip is fitted during manufacture. With the lower access cover open,presence of the battery isolation strip can be checked by a red tab protruding from thepositive side.Care should be taken on subsequent unpacking that any dust which has collected on thecarton does not fall inside. In locations of high humidity the carton and packing may becomeimpregnated with moisture and the de-humidifier crystals will lose their efficiency.Prior to installation, relays should be stored at a temperature of between –25° to +70°C.
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MiCOMP921/P922/P923Voltage and Freq
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Pxxx/EN SS/G11Safety Section Page 1
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IntroductionP92x/EN IT/H42MiCOM P92
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