PROXIMITY CONTROLS - Dwyer Instruments, Inc.
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1. the output relay at the pre set speed Field adjustment of the signal set point is easily accom plished by means of an adjustment screw on the electron ics For underspeed sensing the signal point is set below the normal operating speed of the unit The output relay will then de energize if the speed drops below the signal point For over speed sensing the pick up point is set above the normal operating speed The output relay will energize if the speed exceeds the pick up point Zero speed sensing can be accomplished by turning the adjustment screw to its minimum setting The output relay will then de energize when the shaft speed of the unit approaches zero INSTALLATION LOCATION amp MOUNTING The Series DSS motion switch can be mounted for opera tion in any position The surface to which the switch is affixed should be as flat and as smooth as possible Bearing brackets and shim plate sets can be used to mount the unit directly to the pillow block supporting a shaft On installations where vibration conditions are not extreme use 1 4 diameter machine bolts with lock washers through the four mounting holes in the base of the switch Mounting bolts and lock washers are not furnished with the switch If vibration conditions are extreme use of a doweling is rec ommended through two mounting holes in the switch base The switch should be mounted as axially in line and or par allel as possible to the existing shaft which is to d2. to 45 seconds This setting should be set depending on the application and the length of time it takes for the conveyor to reach its nor mal operating RPM This time delay takes effect upon power up of the Series DSS after shutdown AC power to the Series DSS must be interrupted for timer to be reset This delay only effects start up avoiding nuisance Start up alarms TROUBLESHOOTING PROBLEMS amp SOLUTIONS PROBLEM SOLUTION No pulses from yellow LED Check power supply Make sure input shaft is turning PROBLEM SOLUTION Relay is not energized or de energized Check power supply When expected l e green LED not on Make Sure input shaft is turning Or off when expected Check for proper set point Check for proper speed setting LOW MEDIUM or HIGH PROBLEM SOLUTION Alarm sounds when equipment is started Check start up delay setting Check for proper connections between alarm and relay AC power must be interrupt ed for alarm to reset PROBLEM SOLUTION Alarm does not go off when expected Check power supply Check for proper connections between alarm and relay PROBLEM SOLUTION Equipment is not shut off when expected Check power supply Check for proper connections between control circuit and relay MAINTENANCE Upon final installation of the Series DSS Direct Contact Speed Switch no routine maintenance is required A periodic check of the system calibration is recom mended The Series DSS is no
3. TTI MITY The Series DSS Direct Contact Speed Switch is a compact switch designed to include all mechanical and electronic components in one housing It will produce an output signal at a predetermined speed which may be either over speed under speed or zero speed Rugged heavy duty construction combined with solid state elec tronics and photo electric technology makes this one of the most advanced motion detectors available Series DSS protects all valuable rotating equipment including belt con veyors bucket elevators rotary feeders or screw convey ors It operates in a clockwise or counter clockwise direc tion and mounts in any position PROXIMITY CONTROLS A DIVISION OF DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Bulletin E 17 Series DSS Direct Contact Speed Switch Specifications Installation and Operating Instructions 8 63 64 228 09 94 3 4 1 17 64 3 4 NPT PIPE TAP 3 8 120 65 32 03 BOTH SIDES 9 53 D 1 60 8 D t H FRONT VIEW SIDE VIEW REAR VIEW 2 1 4 718 7 67 15 22 23 7 gaa i 4 atti _ 1 1 4 81 75 MOUNTING HOLE PLAN SPECIFICATIONS Temperature Limits 50 to 150 F 45 to 65 C Enclosure Aluminum with screw cover Enclosure Rating DSS W NEMA 3S 4 amp 4X DSS E NEMA 3S 4 amp 4X NEMA 7 Class groups C amp D NEMA 9 Class Il groups F amp G Switch Type DPDT Ele
4. ain to use the provided ground screw The output of the Series DSS is a DPDT relay There are two sets of output contacts Each set includes normally open normally closed and common As a result the unit can be used to control two separate circuits such as a motor starter and a signal light CONDUIT INSTALLATION Use only hubs of suitable sizes that are UL CSA approved for WATERTIGHT use Install per the hub manufacturer s instructions Be sure the location selected will provide ade quate wire bending space SIGNAL SET POINT FOR USE AS AN UNDER SPEED SWITCH Select the speed range required by changing the switch to LOW for 0 1 to 10 RPM MEDIUM for 1 to 100 RPM and HIGH for 10 to 1000 RPM Turn the set point potentiometer to the counter clockwise stop With motion present on the input shaft and at normal operating RPM the yellow LED should blink The green LED should turn on indicating that the output relay is energized Slowly turn the set point adjustment screw clockwise until the output relay de ener gizes A click will occur at this point Back up until the output relay energizes Thus when speed drops below the set point the green LED should turn off indicating that the output relay is de energized If the normal operating speed of the input shaft exceeds 10 RPM for the LOW 100 RPM for the MEDIUM or 1000 RPM for the HIGH the unit should be adjusted as follows Turn the set point adjustment screw clockwise until it reac
5. ctrical Rating 3A 120 240 VAC 1 10 Hp 120 240 VAC Electrical Connections Screw terminal Conduit Connections 2 3 4 female NPT Mounting Orientation Any Set Point Adjustment Adjustment screw Power Requirements 105 135 VAC 50 60 Hz 210 250 VAC 50 60 Hz or 24 VAC DC depending on model Power Consumption 3 Watts Repeatability 2 maximum at constant voltage and temperature Pick up Point 3 speed ranges at which relay will ener gize Low 0 1 to 10 RPM Medium 1 to 100 RPM High 10 to 1000 RPM Signal Point Speed at which relay will de energize Recommended to be 15 20 lower than pick up point Start up Delay Adjustable up to 45 seconds Radial Load on Input Shaft 125 lbs maximum End Thrust on Input Shaft 100 lbs maximum Rotation Either clockwise or counter clockwise Driving Torque 1 lb maximum Shaft 5 8 diameter with 3 16 x 7 8 key Weight 5 lbs 2 3 kg Phone 219 879 8000 Fax 219 872 9057 www dwyer inst com e mail info dwyer inst com OPERATING PRINCIPLE The Series DSS Motion Switch senses motion by means of a precision metal disc mounted on the input shaft This disc generates measurable light pulses by a series of slots on its periphery which rotate past an infrared light source A photo electric sensor monitors the series of light pulses and converts them to digital electronic signals Solid state cir cuitry then analyzes the digital signals and activates or de activates
6. hes the stop When the speed drops below 10 RPM for the HIGH the relay will energize NOTE Typically the motor contact is wired in series with one of the NO output contacts and an alarm is wired with one of the NC output contacts FOR USE AS AN OVER SPEED SWITCH Select the speed range required by changing the switch to LOW for 0 1 to 10 RPM MEDIUM for 1 to 100 RPM and HIGH for 10 to 1000 RPM Turn the set point potentiometer to the counter clockwise stop With motion present on the input shaft and at normal operating RPM the yellow LED should turn on indicating that the output relay is energized Slowly turn the set point adjustment screw clockwise until the output relay de energizes and the green LED turns off A click will occur at this point with the potentiometer on that setting if the speed increases the output relay will ener gize NOTE Typically the motor contact is wired in series with one of the NO output contacts and an alarm is wired with one of the NC output contacts FOR USE AS A ZERO SPEED SWITCH Select the LOW speed range by changing the switch to LOW for 0 1 to 10 RPM Turn the set point potentiometer to the counter clockwise stop This will give a set point of 0 1 RPM Thus when the speed drops below 0 1 RPM the out put relay will de energize NOTE Wiring should be the same as for under speed appli cations TIME DELAY SETTING The Series DSS motion switch has a start up delay that is adjustable up
7. rive the Switch The Series DSS motion switch can be driven by one of the following means 1 FIGURE 1 Suggested Coupling Arrangement side view Direct connection through a coupling preferred means Note Switch should be concentric with the mating shaft If stub is used it must be concentric with the main shaft If a stub shaft is required we suggest the use of a 5 8 stub shaft Use with a split or flexible type coupling Customer s shaft with concentric stub shaft e y i EN 2 FIGURE 2 Cog Belt Drive timing or Roller Chain Drive A V Belt drive is not as desirable because of possible slip page oo Cog belt timing or roller chain drive 3 FIGURE 3 Suggested Spur Gear Arrangement top view Customer s shaft with concentric stub shaft Spur gears Ca WIRING FIGURE 4 Electronics View Normally open 2 r Normally closed 2 Normally open 1 Common 1 L2 L1 Use only solid conductors of 14 AWG of smaller Normally closed 1 Common 1 Speed set point 11 c YQ Time Delay Green LED Indicates relay energized Speed Range LHM Yellow LED Indicates pulses Remove end cap to expose terminals and pick up speed adjustment screw Wire input power from source to termi nals L1 amp L2 Be cert
8. t field serviceable and Should be returned if repair is needed field repair should not be attempted and may void warranty Be sure to include a brief description of the problem plus any relevant application notes Contact customer ser vice to receive a return goods authorization number before shipping Copyright 2007 Dwyer Instruments Inc Printed in U S A 6 07 PROXIMITY CONTROLS A DIVISION OF DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Phone 219 879 8000 Fax 219 872 9057 FR R4 443493 00 www dwyer inst com e mail info dwyer inst com
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