ASiSA USER`S MANUAL - Electro
Contents
1. MGN ELECTRO SENSORS NY ASiSA AS Interface Speed Alarm USER S MANUAL e Circle Drive 2 AA Free Catalo g and Application Assistance innetonka MN 55343 MEN 1 800 328 6 952 930 0100 o ELECTRO SENSORS Visit Us Online 930 0130 MY WW tro se O 2000 Certified rior Systems e Solutions 990 0028 00 Revision Description ASiSA continuously monitors rotating shaft speed comparing it to a trip point setting and alarming when less than the trip point The ALARM state is accessible over AS Interface communications and visibly indicated by the internal ALARM led The rugged unit requires a shaft mounted magnetic pulser target disc or wrap such as the model 255 pulser disc included The rotating pulser target produces an alternating magnetic signal at ASiSA s stationary sensing head The signal frequency varies in direct linear proportion to the rotating target s rpm ASiSA senses this frequency and compares it to the TRIP POINT setting When the frequency falls below the TRIP POINT setting ASiSA is alarmed When the frequency exceeds the TRIP POINT setting ASiSA is not alarmed Measurable Speed Range The ASiSA TRIP POINT frequency is adjustable within the range 0 53 27 Hz The frequency f to RPM conversion is given by the formulas RPM f 60 PPR Where f is in Hz pulses per second and PPR is pulser target pulses per revolution Since RPM changes inversely with PPR increasing PPR scales TRIP POINT RPM r2. ange down Pulser Target Corresponding TRIP POINT RPM range Model 256 Pulser Disc 4 PPR 8 0 400 Model 255 Pulser Disc 8 PPR 4 0 200 Custom Pulser Wrap 16 PPR 2 0 gt 100 AS Interface Profile S B A E A B slave free profile I O code B AS Interface Parameter bits P3 P2 P1 PO master Write Parameter info unused unused unused AS Interface I O Data bits D3 D2 D1 DO Output master Data Exchange req info unused unused Input slave Data Exchange resp info ALARM unused 1 ALARM D3 polarity 1 Alarmed speed less than TRIP POINT setting 0 Not Alarmed speed greater than TRIP POINT setting LEDs LED ON OFF ALARM Alarmed Not Alarmed POWER Receiving Power Not Receiving Power ASi status Communication OFF Communication ON Mechanical installation ASISA may be mounted on rigid conduit or with the mounting bracket assembly provided The gap A between the sensing head and the Pulser Disc Wrap must be 1 16 to 1 4 inch The center line of the magnets B must align with the center of the sensing head as the Pulser Disc Wrap rotates Remove the round cover from the housing and pull AS Interface network cable through the conduit port into the enclosure Connect the 2 cable wires to the terminal plug With Pulser Wrap Target Setting the TRIP POINT With network power applied and the shaft turning at normal operating spe
3. ed slowly turn the TRIP POINT potentiometer clockwise until the ALARM led turns on Then slowly turn the TRIP POINT potentiometer counter clockwise until the ALARM led turns off How far below this point you set the TRIP POINT will determine how far below the current shaft speed the ASiSA will alarm Firmly screw the round cover back onto the housing for normal use Specifications Connector Power network supplied TRIP POINT Setting Range LED indicators AS Interface Specification Extended A B addressing Profile Airgap sensing head to Disc Wrap Operating temperature Enclosure hazardous locations ratings Weight with bracket Dimensions with bracket 2 conductor phoenix style terminal plug 20 31 6 Vdc 30 mA maximum Potentiometer single turn 280 linear response 0 53 27 Hz 4 0 200 rpm with 8 PPR disc wrap ALARM red POWER green ASi status red v2 11 Yes S B A E 1 16 1 4 inch 2 6 mm 25 85 C 13 185 F Class I Div 1 Group C D US Class II Groups E F G UL File E249019 c UL LISTED 2 45 Lb 1 11 kg in inches 4 40 138 p
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