Protector Trip Relays - Crompton Instruments

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Speed SensingThe Speed Sensing protector trip relay monitors rotatingequipment using a magnetic pick-up and provides three outputcontacts which can be used to initiate alarms or shutdown signals.The relay also provides a tachometer output for speed indication.Basic Parameters• Magnetic pick up input• 1mA output signal• 3 adjustable rotation set points• Power on LED (green)Part no. Type ProtectionPH3 Speed sensing Crank 10 to 50%Under-speed 50 to 100%Over-speed 100 to 130%OperationThe Speed Sensing relay will detect under-speed, over-speed and stop conditions,the set points can be used to raise an alarm or shut down the monitoredequipment. The front panel provides three user set trip levels with relay LED stateindication and a speed indicator analogue output signal in the form of 0-1mA.The relay can be calibrated such that the standard 100% of the relay represents therequired nominal engine speed. This is achieved by supplying the appropriate inputto the sensor input terminals and pressing the adjust button for more than 3seconds thus tripping the relay to become 100% reference.Cranking TripThe cranking function detects if the engine is running or stopped. This function canbe used to ensure the cranking motor is disconnected once the engine has startedrunning. The crank yellow LED illuminates and the relay energises when the enginespeed exceeds the cranking setting. This is normally set just above the crankingspeed of the crank motor to indicate the engine has started.Under-Speed TripThe under speed red LED illuminates and the relay de-energises when the enginespeed falls below the under-speed control setting minus the fixed 2% differential.Over-Speed TripShould the engine speed exceed the over-speed control setting, the over relayde-energises and the red over LED illuminates.Fail Safe OperationShould the sensor become disconnected (open circuit) the over red LED flashes,the over relay de-energises and the crank and under relays energise (crank andunder LED's illuminate).Characteristics26
Speed SensingTechnical parametersPH3-12/24•Magnetic pick-upSystem typeSpeed sensingSupply terminals AUX (+/-)Sensor terminals PULSE IN (+/-)Supply voltage12-24V DCSupply voltage burden (max)2.5VA/1.4WSupply voltage tolerance +20/-10%Input pulse amplitude5-75V p-pFrequency range0-1kHz min, 0-10kHz maxTrip settings:Cranking 10-50%Under-speed 50-100%Over-speed 100-130%Differential Fixed at 2%Analogue (meter) output0-1 mAat 100% rated speed0.75 mAat 133% rated speed1.0 mAOutput relay-contact; for general switching operation3x change over (AgNi) plated, volt-freeOutput relay-contact terminals 11, 12, & 14, 21, 22 & 24, 31, 32 & 34Load capability of relay contact AC250V/8A, max.2 KVALoad capability of relay contact DC30V 8AMechanical life3x10 6 by rated loadANSI no. 12/14Operating temperature-20 +55°CStorage temperature-30 +70°CElectric strength (supplying -contact relay)4kV/1min.Overvoltage categoryIII.Pollution degree 2Enclosure integrityIP40 from the front panel/IP20 terminalsEnclosure styleDIN-rail, 3 moduleCase materialFlame retardant polycarbonateConnecting conductors profile (mm 2 ) Max 2x1.5mm 2 /1x2.5mm 2DimensionsH90xW52xD64mmWeight145g approxStandardsEN 60255-6, EN 60255-27, EN61000-6-2, EN6100-6-4Protector OverviewPH3ConnectionPH3MAGNETICSENSORMETERPOWERSUPPLY+ - + - + -RELAY CONTACTSUNDER OVER CRANK12 11 14 22 21 24 32 31 3427
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Protector Trip Relays - Crompton Instruments

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