Two and Three Element Speed Switches

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1 SECTON N T E RN A TtONA Speed Supersedes EG 70-12B and EG 70-12C Both Dated December 1984 Two and Three Element Speed SWA 675 SWA 675 A-1 Pr,/led in USA :,sued J_rlu_ry 1991

2 SECTON Speed NTERNATONAL NTRODUCTON Two- and three-element speed switches have two or three is in the form of a relay energizing and a LED lighting. frequency adjustments which are designed to signal when Manual testing and reseting of one of the switches particular engine speeds have been reached. The frequency (OVERSPEED) is provided. A voltage output is available input is usually from a magnetic speed sensor which is for connection to a tachometer. sensing engine speed. The signal from each of the switches SPECFCATONS SWA 676B THREE ELEMENT SPEED SWTCH PERFORMANCE --nput mpedance... 5K ohm --Response Time milliseconds nominal --Cranking Termination Set Point Range Hz (25 turn control)-n.c, and N.O. contacts --Parallel (Auxiliary) Set Point Range Hz (25 turn control)-n.c, and N.O. contacts Automatic Reset: 6% below set point --Overspeed Set Point Range Hz (25 turn control)-n.c, and N.O. contacts --Tachometer Signal... Adjustable (May require suppresed zero adjustment. See Figure 3.) --Repeatability of Set Points... Cranking: _+5% maximum over temperature range Parallel (Aux): +2% maximum over temperature range Overspeed: + 1% maximum over temperature range --Resets... Crank: latching, remove power to reset (see Page 5)... Parallel: non-latching, automatically resets when frequency drops below set frequency... Overspeed: latching, reset switch or remove power POWER NPUT --Magnetic Speed Sensor Signal volts rms (referred to DC negative) --Supply VDC (reverse voltage protected to 800 volts) --Polarity... Case isolated --Power Consumption watts maximum - standby less than 0.75 watts 32V nominal --Relay Contact Ratings... Dual 5 Amp. 250 VAC, 1250 VA maximum, 5 Amp. 30 VDC ENVRONMENTAL --Temperature Range to + 70 C (-40 o to F) --Relative Humidity... up to 100% --Case... Fungus proof and corrosion resistant PHYSCAL --Dimensions... See Figure 1 --Weight kgs (1.9 lbs) --Mounting... Any position RELABLTY --Tested % --Vibration... All printed circuit boards are conformally coated on both sides SWA 675 and SWA 675A-1 SPEED SWTCH (see Variations, Table 1, Page 4) Same as SWA 676B with following exceptions --Parallel (auxiliary) switch omitted --CRANK reset... SWA 675: latching (same as SWA 676B)... SWA 675A-1: non-latching: remove power, or automatically resets at zero input frequency. Printed in U.S.A. Page 1 ssued January 1991

3 SECTON ["_"_E R N A T O N A L Speed 6.76 mm.266" DA. J 26.2 mrn (_ oo = ', QVERSPEED RESET TEST r _, O OVERSPEED ' i PARALLEL,, 127 mm 5.00" CRANK O --%,, 140 mm 5.50" TACH CAL _ j = i / BAT TACH CRANK PARALLEL OVERSPEED, k_,,,,_ PCKUP OUT 5 6r-, _"-_(-, 7 8 r-_ 9 _ _- k--j,,_q '!,r "-"-'_'_ 1 r "_'_ mm.250" "" " 127 mm : " rnm 146 mm " Figure 1. Speed Dimensions DESCRPTON Once DC power and input signal is applied, the speed switch As the speed surpasses the set points, the internal relay becomes functional. The input signal is typically a magnetic changes state and an indicator (LED) lights. The set points speed sensor monitoring the engine flywheel ring gear or any for the three speed settings are independent and can be other convenient gear available on the engine or machine, adjusted precisely with its own 25 turncontrol. Each element Any other signal source can also be used as long as it meets functions in the following manner: the low speed (cranking) the signal requirements in the specification, element latches when the setpoint has been exceeded. Parallel use of the magnetic speed sensor is advisable as long Cranking duration may require a time limit for unattended as the speed sensor signal level meets the specification, installations. The mid speed (paralleling) element after Failure of the speed sensor signal must automatically shut energizing must fall to 6% below its set point before off the speed control unit, if used, since all functions within automatic resetting. The high speed element (overspeed) the speed switch will cease with a speed sensor signal which latches and remains on until power is removed or the overspeed reset button is pushed. The test button lowers does not meet the specification. As the speed of the rotating gear increases, the frequency of the AC signal from the the overspeed setting by 30%, thus initiating a shutdown. magnetic speed sensor increases until each set point (low, Routine testing is recommended to insure positive mid, and high) is surpassed, protection. Prir_ted in U.S.A. Page 2 ssued January 1991

4 SECTON G 0 VERNNG S YS TEMS -_* NTERNATONAL Speed A tachometer output is available to measure speed. The 3 (-). A 1 milliampere movement may be used. Set the wiring is shown in Figure 2. Calibration is simple and tachometer calibration adjustment 25 turns CW. Connect requires only a known standard or oscillator. The graph in the meter observing polarity. Figure 3 shows the voltage available at terminals 5 (+) to F 100K-ohm rj" removed, / t_ OVERSPEED CRANKresets i _r,,,_ autom.tica,,y - _-- OO,),/ RESET TEST JUMPERFOR / _ [ OVERSPEED 12vONL [_ outline ""T- /'_ L_J _ CRANK LED's } _RAL,E, jagged,_._._, "1 _6 TACH*CAL / /// O/ BAT TACH CRANK PARALLEL OVERSPEED PCKUP - + OUT r -_ r H --J,J -i MAGNETC SPEEDSENSOR /\ ANDSWA675A1}CONTACTS OPTONAL CONNECTON TO "-7 SPEEDCONTROL UNT SG TERMNAL.S GND /_._ + "C" SERES S T ECD / ECD C D BATTERY ECJ Figure 2. Wiring to Speed Printed in U.S.A. Page 3 ssued January 1991

5 SECTON _T E R N A T O N A L Speed 6 / 4 TACH CALBRATON ADJUSTMENT RANGE WTH 5.1 K-ohm TERMNAL 5 BETWEEN TERMNALS OUTPUT VOLTAGE 3 _- ":. _ 5 and 3. (VOLTS DC) 2 1 ) o _ l l 1 1 8K 10K 12K NPUT FREQUENCY (HZ) --* Figure 3. Output.voltage versus frequency Withan accurate signal source for the magnetic speed sensor the tachometer does not read zero, adjust the meter's zero or using a master tachometer on the engine, bring the engine adjustment. Recheck the maximum setting and trim with the or signal up to the maximum operating speed or full scale as tachometer calibration adjustment. f a meter movement desired on the tachometer. Turn the tachometer calibration lower than 1 milliampere is desired, a fixed series resistor adjust CW until the reading corresponds with the master will be required (see Adjustments). tachometer. Stop the engine or remove the signal source. f SWA 676B ' 3 CRANK, PARALLEL, OVERSPEED latching / SWA CRA_, OVERSPEED latching SWA 675A-1 2 CRANK, OVERSPEED non-latching Table 1. Variations in Speed Printed in U.S.A. Page 4 ssued January 1991

6 EN T E R N ATO N A L SECTON Speed NSTALLATON An installation wiring diagram is shown in Figure 2. connected to Ground. Shielded wire is recommended. Connect the shield to terminal 2. Do not connect the POWER shield to ground at the magnetic pickup unit. Connect a DC power source to terminals 4 (DC +) and 3 (Ground). The unit is designed for 24 VDC power. For 12 TACHOMETER VDC: remove cover and solder jumper between posts E4, Output on pin 5 is designed to drive a 1 ma DC ammeter E5 (see Figure 2). For 32 VDC: remove cover and solder movement. Figure 3 shows output voltage adjustment range jumper between posts E4, E6. No jumper required for 24 V (appx mV/KHz, beginning at 0.0 VDC at zero systems. Figure 2 shows post locations, frequency. MAGNETC PCKUP UNT Connect to terminals and 2. Terminal 2 is internally ADJUSTMENTS CRANK OVERSPEED This adjustment is factory set to its minimum setting in This relay switch and associated LED are latched. f the order to avoid inadvertent damage to the starter motor. t input frequency drops below the set point, removing DC may be necessary to increase set speed (clockwise adjust- power or pushing the momentary "Reset" switch will ment) to enable engine to start initially. Green LED lights reset the switch. This switch is factory set to energize when CRANK relay is energized, when input frequency reaches approximately 8060 Hz. On models SWA 676B and SWA 675, the CRANK relay Pushing the momentary "Test" switch lowers the adjusted is latched and only removing DC power will reset it. set frequency by approximately 30%. To set an overspeed Removing the 100 K-ohm resistor installed across posts set frequency, adjust engine speed to 70% of desired El, E2 (Figure 2) will defeat this feature, and the unit overspeed set point. Then, push "Test" switch and hold will then reset automatically when input frequency is at while turning Overspeed adjustment counterclockwise. When or very near zero. red Overspeed LED lights, the adjustment is complete. On model SWA 675A-1, the resistor mentioned above is not TACHOMETER installed. The unit resets by either turning power off or For meters with high input impedence (greater than 50 reducing input frequency. K-ohm), a 5.1 K-ohm, 1A W resistor from terminal 5 to PARALLEL ground (terminal 3 or 2) will result in a larger adjustment This auxiliary relay switch and associated LED is on model range for the TACH potentiometer. (Figure 3, bracketed SWA 676B only. t is factory set to energize when input region) frequency reaches approximately 6000 Hz. t is nonlatching and resets automatically when input frequency drops approximately 6% below the set point. TROUBLESHOOTNG Remove the tachometer connections at terminals 3 and 5. f the reading does correspond, check wiring to the relays. With DC power applied and using the magnetic speed sensor Should both the magnetic speed sensors and relay wiring signal or an oscillator as a speed input, measure the voltage prove to be satisfactory, then the unit is defective. at terminal 5 with reference to Figure 3 (open circuit output). f the reading does not correspond, check the magnetic speed sensor signal. Printed in U.S.A. Page 5 ssued January 1991

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