Dial Weight Dynamometer User's Manual - Electro
Contents
1. P IR 9 MID MAU Oe D 9 Salient Pole Etect C OGGING coda Ad Pu E Re eds 10 Figure 4 Hysteresis Brake Cross section ssccccccccessscsccesecssseeecsssseseeseesseenaeseesssenanssesssensaesseessensaes 10 4 SPEED AND TORQUE cu ae E r a raa aa serate que E crest eur seede Rer up ODER cosine aly 11 oil c Cr PEE 11 Figure 5 Optical Encoder Circuit ies see eene ee ninnneinnnn s ennhn anstatt sss a neris 11 TOFIQUE e osse e d adu ducum NM adc DM LAMP D Me 11 Figure 6 Calibration Setup tive e pet e i an ed eet rre d XE RERO eee ec pen poen HO 11 Torque Galibratio eT ERR 11 Hysteresis Brake Control Power oo dde o taie Aids 12 Torque Sable tata S euo i iC M ace 12 Eddy Gurrents Effects oce o ee Pru ee totae orbes rie te eei indul 12 Temperature Rise Effects ii a 12 5 POWER SUPPLIES iii 13 Model 5200 2 m EU ti 13 Figure 7 Model 5200 Front and Rear Panels sse eee 13 Model 5200 2 Circuit Description score 13 Figure 8 Model 5200 2 Schematic sss narrar 13 Model G2 L0 e EM 14 Figure 9 Model 5210 Front and Rear Panels 22202 nisser NR ES nn nana Aea nn 14 Model 5210 2 Circuit Description sucias ti iia 14 Figure 10 Model 5200 2 Schematic sss cnn cane ta nnne rans enata 15 While every precaution has been exercised in the compilation of this document Magtrol Incorporated assumes no responsibility for errors or omissions Addi2. Dial Weight Dynamometers User s Manual MAGTROL INC Sales and Technical Assistance 70 Gardenville Parkway Buffalo New York 14224 In New York 716 668 5555 Outside N Y 800 828 7844 Fax 716 668 8705 www magtrol com Manufacturers of Motor Test Equipment Hysteresis Brakes and Clutches 74M015 12 99 25 Table of Contents SALES AND TECHNICAL ASSISTANCE scsi iaa 2 1 SETTING UP THE DYNAMOMETER ocasion 4 A KING 25 sions dites spun a E E E E Er E reen aii edat 4 Initerconnections tee aa hate knibe tants 4 Dynamometer Leveling si A A A rede 4 Figure 1 Torque Scale io etes o eda abra Ee dete uet es 4 Initial CheGKOUL iiie situs enira Eram idad 4 2 DYNAMOMETER SPECIFICATIONS iss cascants svat casvecvorese tics tenes catpucas Cox E Yea apena Oba seeren ennen eee es 5 Power Dissipation MEE 5 Figure 2 Dynamometer Side View sessi sisse seinen enint h esent rr nasi ann nnn 5 Power Absorption GUNES ienien as 6 VNo U lE LOA MM O AE Pp 8 General Statement of Accuracy iii tertre trenn test RR t M a Re e ERR NR eerta 8 WIN ge e 8 icm Ooe e 8 3 MOTOR WISI pepe E 9 Motor EiXturin O T em 9 Figure 3 Typical Allowable Misalignment esses eese nnne nnn nnne nennen nnns 9 cra
3. Motor Testing Magtrol Dial Weight Dynamometer User s Manual SALIENT POLE EFFECT COGGING ROTOR POLES ROTOR ASSEMBLY Figure 4 Hysteresis Brake Cross section The cross section sketch shows by one tooth the magnetic relationship of the hysteresis brake elements If the dynamometer shaft is at rest with torque applied and if the torque control is then reduced to zero a magnetic salient pole will be temporarily imposed on the magnetic rotor of the hysteresis brake If the shaft is then rotated slowly the magnetic poles on the rotor will attempt to align with the adjacent case pole tooth form This is often referred to as cogging The action is sinusoidal in that first it tries to resist rotation then as the rotor passes through the tooth form it subsequently supports rotation Ata few hundred RPM these forces integrate resulting in an effective torque of nearly zero To avoid magnetic cogging Before the shaft comes to rest reduce the torque control to zero To remove cogging once established reapply torque onto the dynamometer Then decrease the torque control while the shaft is rotating 10 4 Speed and Torque SPEED If your dynamometer contains a speed pickup there will be two cords one terminating with a two pin plug for the brake power the other is a 14 pin plug servicing an optical encoder 5V Pin 7 R2 R1 300
4. 470 5 2 OPB963 4 Fo Pin 10 1 3 U1 Pin 8 Figure 5 Optical Encoder Circuit This encoder consists of an infrared transmitter receiver pair On the end of the dynamometer shaft positioned between the LED and detector is an optical disc with opaque and clear segments Rotation of the disc results in the detector generating a frequency of 60 pulses per shaft revolution TORQUE Torsional force acting upon the hysteresis brake is produced by the test motor and applied to the brake s rotor shaft assembly Whatever torque exists on the rotor shaft must be reacted upon equally by the suspended brake dial weight assembly Sir Isaac Newton defined this effect some time ago Since the brake assembly is imbalanced by the suspended weight attached to it torsional force will lift the weight The graduated dial provides With the Base Plate and the Beam level a readout value equal to this torque Once the pial Reading D xW weights are calibrated to match the dial graduations the system accuracy becomes permanently fixed When torque is defined by a point on the radius of a weight lifted in a circular motion the scale derivation is inherently a cosine function thus the nonlinear scale graduations TORQUE CALIBRATION If you wish to check the torque calibration accuracy it will be necessary to apply a precisely known torque value The most accurate method to apply a known torque is with the use of a b
5. NOTE Ofthe four 4 voltage positions shown on the fuse holder only the 120 V and the 240 V positions are active Selecting either the 100 V or the 220 V position will not apply line power to the power supply Therefore use only the 120 V or 240 V positions NOTE The line cord must be removed before removing the fuse holder Fuse replacement Pry out the fuse holder with the blade of a small screwdriver remove and replace the fuse For 120 Vrms power use a 1 Amp fuse For 240 Vrms power use a 1 2 Amp fuse wht The 5200 2 was shipped set for 120 Vrms LINE GND power This can be verified by observing the location of the round white tab in the fuse holder of the power line filter module that is located on the rear panel it should show through the 120 V hole Line power can be NEU 3 177 6VM2 LP56 850 Figure 8 Model 5200 2 Schematic 13 J L T1 H 2 5 2 E PE05 E E 1 6 BR1 D D 4 7 L C1 R4 F F 10002 5 1K G G 7 Power Supplles Magtrol Dial Weight Dynamometer User s Manual MODEL 5210 2 This power supply is similar in application to the Model 5200 2 except that the 5210 2 is current regulated This means that the brake operating current is maintained constant at the set level The torque variations resulting from fluct
6. 240 Vrms as is done for the model 5200 2 Refer to page 23 of the MODEL 5200 2 Circuit Description for instructions An EXTERNAL CONTROL input is provided at the rear of the 5210 2 to adjust the dynamometer current from an external O to 5 0 Vdc input This input is scaled for 5 0 Vdc equals the full scale output current of each current range 0 2 0 5 and 1 0 Amp The EXTERNAL CONTROL input plug is a MAGTROL p n 85M034 Switchcraft 750 When this connector is plugged in the front panel ADJUST control is nonfunctional MAGTROL Model 5210 Power Supply MED X D ON O 0 H OFF O BRAKE CURRENT RANGE ADJUST POWER O BRAKE N EXTERNAL CONTROL H M bi 0 5VDC O 120V 1A o 90V 48 63 Hz 60VA FUSE SAY 240V 1 2 A aw O MAGTROL INC BUFFALO NY A Figure 9 Model 5210 Front and Rear Panels MODEL 5210 2 CIRCUIT DESCRIPTION Functionally the circuit is a closed loop current feedback amplifier regulating the output current at the value set by the front panel controls DC current from the internal 35 volt power supply passes through the dynamometer coil connected at the BRAKE connector J6 through the insulated gate field effect transistor Q1 HEXFET and through a current sense resistor R13 R14 or R15 selected by the RANGE control The voltage drop across the current sense resistor is amplified by
7. Operational Amplifier U1b and applied to the non inverting differential input of Operational Amplifier Uta Amplifier U1a amplifies the difference between the conditioned current signal from the sense resistor and the voltage from the front panel current ADJUST potentiometer R6 This amplified error voltage is applied to the gate of transistor Q1 to control its channel resistance and thereby regulates the output current at the value set by the ADJUST control Current is displayed by a 3 1 2 digit liquid crystal panel meter 14 Magtrol Dial Weight Dynamometer User s Manual Power Supplies Q1 i CR6 R25 L CR5 D DE 1N4745 G 13W R9 IRF740 201 c5 Ta7 pr 200 C8 T 001 R23 10M EXTERNAL CONTROL INPUT RANGE SHOWN HIGH POSITION R17 9 53k R20 1k 1ACAL J3 Y a le l5 l4 2 IH NZ AC INPUT i 5 S M BRI 5V CRI Ri LM340T15 P VR1 D y Ci C2 vat C3 EL 7 A R24 1000 1N5060 560 1 gt 8 6VM2 LP56 850 7 Y CHASSIS Figure 10 Model 5200 2 Schematic 15 MA ACZTRPRODI 70 Gardenville Parkway Buffalo New York 14224 Phone 716 668 5555 800 828 7844 Fax 716 668 8705 Web site www magtrol com E mail magtrol magftrol com
8. CCURACY Much of the above is dependant upon motor horsepower fixturing and other circumstances beyond the control of Magtrol As a general rule if reasonable care in taking readings is exercised motor test data accuracy better than 1 5 of a torque speed value can be expected Some torque scale graduations are more difficult to read rapidly than others What usually works well for most people is to record torque data points from the easiest reading scale then correct all your data to correspond to the particular range counterweight selected by multiplying or dividing by 2 or 4 WINDAGE Although a smooth surface the dynamometer rotor will drag air around with it Most of this air movement is tangential to the surface and impinges upon the stationary field assembly This acts as viscous drag and becomes part of the motor load and torque reading However there is a small amount of air dissipated as pumping loss This becomes error since it is produced by the test motor but not part of the dynamometer reading Windage effect on accuracy has been conducted on all Magtrol Dynamometers Pumping loss is between the range of 025 and 20 of maximum full scale torque atthe maximum rated RPM The larger figure tending toward the smallest capacity HD 106 dynamometer Since pumping loss increases by the square of an increase in speed above maximum rated RPM the error magnifies rapidly conversely at speeds below rate
9. Power 550 Watts 0 0 10 20 30 40 50 60 70 80 MINUTES TO 100 C 1 0 Model HD 700 1 D 4995 5000 y 90 H 5 875 6 60 Torque Ranges 100 200 400 oz in tJ Input Inertia 551 Slug Ft x 105 9 n Maximum Speed 15 000 RPM 20 Maximum Input Power 650 Watts o 0 10 20 30 40 50 60 70 80 MINUTES TO 100 C Model HD 705 1 D 4995 5000 H 5 875 Torque Ranges 200 400 800 oz in Input Inertia 1 100 Slug Ft x 10 Maximum Speed 10 000 RPM Maximum Input Power 1400 Watts HORSEPOWER MINUTES TO 100 C Dynamometer Specifications Magtrol Dial Weight Dynamometer User s Manual ACCURACY All Dial Weight systems on all ranges of each dynamometer model are calibrated to an accuracy of 1 of the torque reading with the following exceptions HD 106 1 5 oz in scale HD 106 1 1 0 oz in scale HD 400 1 2 0 oz in scale 2 of HD 400 1 8 0 oz in scale Full Scale HD 400 2 8 0 oz in scale HD 500 1 25 0 oz in scale Other factors that affect accuracy are coupling losses and dynamic windage effects e Coupling losses After a period of running depending on the size of the motor dynamometer if the coupling becomes hot to the touch or if the dynamometer motor vibrate badly coupling loss error can be in the order of several percent Please see Chapter 3 e Windage This effect is described more extensively below At speeds up to 6000 RPM it is negligible GENERAL STATEMENT OF A
10. X 1 9 X 10 HP Oz Ft X RPM X 1 19 X 10 HP Lb In X RPM X 1 59 X 10 HP G Cm X RPM X 1 38 X 10 HP N m X RPM 1 4 X 10 The following sketch shows the identifications for shaft height H and diameter D used in the following specifications Figure 2 Dynamometer Side View Dynamometer Specifications Magtrol Dial Weight Dynamorneter User s Manual POWER ABSORPTION CURVES Model HD 106 1 D 1245 1250 H 3 50 Torque Ranges 0 5 1 0 2 0 ozin Input Inertia 7 04 Slug Ft x 107 Maximum Speed 30 000 RPM Maximum Input Power 40 Watts HORSEPOWER 03 05 04 02 Ol 0 4 8 12 16 20 24 28 32 MINUTES TO 100 Model HD 400 1 2 D 2495 2500 H 3 50 Torque Range 1 2 8 16 oz in Torque Range 2 8 16 32 oz in Input Inertia 15 5 Slug Ft x 10 Maximum Speed 25 000 RPM Maximum Input Power 190 Watts HORSEPOWER MINUTES TO 100 C Model HD 500 1 D 3745 3750 H 4 00 Torque Ranges 25 50 100 ozin Input Inertia 80 5 Slug Ft x 10 Maximum Speed 20 000 RPM Maximum Input Power 375 Watts HORSEPOWER MINUTES TO 100 C Magtrol Dial Weight Dynamometer User s Manual Dynamometer Specifications 1 0 Model HD 600 1 D 4995 5000 lr ER H 4 812 3 60 Torque Ranges 50 100 200 oz in 2 ig Input Inertia 233 6 Slug Fe x 107 Q Maximum Speed 20 000 RPM 20 Maximum Input
11. d RPM the effect quickly becomes immeasurably small FRICTION Some friction exists in the carrier bearings Correctly loaded and lubricated it is negligible The level may be quantitatively established by doing the following e Remove all attachments to the dynamometer shaft e Swing the brake assembly up to full scale by hand e Carefully allow the assembly to return to zero without swinging back and forth e Repeat the above in the other direction if necessary and observe the amount the reading is off zero Any difference should be within the accuracy specifications outlined above During actual motor testing there is usually enough system vibration to maintain the carrier bearings settled negating frictional effects If you should determine there is an excessive drag or stickiness mechanical realignment axial preloading may be necessary Please contact Magtrol Customer Service for assistance 3 Motor Testing MOTOR FIXTURING Because of the wide variety of motor shapes and sizes Magtrol cannot provide standard motor mounting fixtures We will be pleased to quote the fabrication of special fixturing for you Contact Magtrol Customer Service When mounting your test motor please consider the following e Construct precise fixturing that provides good shaft alignment e Secure the test motor torsionally in the fixture and bolt the fixture to the dynamometer base plate e Give cons
12. eam and weight system Figure 7 shows the calibration set up using a beam with pins installed at a precise distance from the shaft centerline There are various sizes of these torque beams available from Magtrol Contact Magtrol Dynamometer Sales e First apply full torque onto the dynamometer to restrain the shaft from rotating e Attach a calibrated and balanced beam onto the dynamometer shaft Lock the beam with the locking screw against the flat on the shaft e Suspend a known weight at a known distance on the beam e By restraining the beam from rotation and maintaining it in a level position lift the weight dial assembly until a balance is attained between the assembly and the beam Observe the deviation if any and you have established the system accuracy Please note The calibration beam must be maintained exactly level at all times Also to attach a weight onto a pin fashion a loop of light but strong line or thread on the weight Do not use a wire hook Hooks apply the force slightly off the centerline of a pin thereby creating an albeit small but measurable error Figure 6 Calibration Set up 11 Speed and Torque Magtrol Dial Weight Dynamometer User s Manual HYSTERESIS BRAKE CONTROL POWER Hysteresis brakes require direct current for torque control They will not respond to alternating current above a few Hz The nominal voltage rating for all Magtrol Hysteresis Brakes is 28 VDC The f
13. ideration to the interaction of materials between the motor and test fixture For example a magnetic steel plate placed against the exposed lamination of an open frame motor can significantly influence performance Some thin shell PM motors may be similarly affected e The dynamometer base plate material is aluminum tool plate that is easily drilled and tapped The use of helix thread inserts is a good idea if you are going to interchange fixtures often The following is a general recommendation of allowable shaft misalignment as a guide The tolerances specified assume the use of high quality double flexure couplings This type of coupling two flexing elements separated by a solid link inherently tolerate greater parallel offset If you would like specific coupling recommendations contact Magtrol Customer Service 1 Lb In range 2 300 Lb In range 5 m duse 7 1 Lb In range 015 PARALLEL OFFSET 300 Lb In range 030 Figure 3 Typical Allowable Misalignment SAFETY For general safety considerations when shaft speeds exceed a few hundred RPM or motor horsepower attains significant levels please follow these few common sense rules e Be sure that your coupling is adequately rated for the speed and torque that you intend to run e Always wear safety glasses when working around dynamometer test equipment e Never allow anyone to stand close to the side of or lean over a shaft coupling e In
14. mometers are power absorption instruments As a dynamometer loads a test motor it is absorbing horsepower from the motor into the Hysteresis Brake The brake converts this energy into heat There are finite limits to the operating temperature that any absorption brake can withstand Rapidly rising temperature from excessive power input can cause severe mechanical distortion of the rotor assembly This in turn may cause that rotating assembly to contact the stationary members that surround it Once this happens metal transfer and seizing of the brake may occur At high shaft speeds the effect is usually memorable More moderate but still excessive power over an extended period of time can result in more obscure damage bearing lubricants break down magnetic coil insulation degrades and or plastic parts may warp out of shape The following graphs of Horsepower Vs Time provide a reference for allowable power dissipation Please take a moment to familiarize yourself with any limitations that may apply to your dynamometer and motor testing requirements The Power Time specifications assume the following conditions Maximum desired brake temperature 100 C Ambient Temperature 25 5 C The following Torque Speed to Horsepower conversion formulas are provided for your convenience They are sufficiently accurate within 196 to establish HP for use in heat rise determination curves HP Oz In X RPM X 10 HP Lb Ft X RPM
15. ollowing is a listing of the resistance and current for each brake by Dynamometer Model Model Res Ohms F S Current HD 106 171 164 HD 100 180 155 HD 400 80 350 HD 500 120 233 HD 700 80 350 HD 705 40 700 TORQUE STABILITY A major advantage in using a hysteresis brake as a loading means is the ability to produce torque essentially independent of speed This permits very low speed and locked rotor torque testing Besides control current there are two other factors that have a minor secondary influence on hysteresis brake torque Please note that the torque changes in the following explanations are always part of the actual torque measured as applied to a test motor and not errors EDDY CURRENTS EFFECTS Magnetically induced currents within the brake rotor cause an increase in brake torque proportional to an increase in speed These are referred to as Eddy Currents As hysteresis brakes become larger both the rotor surface velocity and the rotor cross sectional area increases These factors compound such that eddy current generation is much more significant on larger size dynamometers On the smaller dynamometer Sizes the eddy current torque component adds approximately 2 to 4 per thousand RPM to a static fixed current torque value TEMPERATURE RISE EFFECTS Temperature rise has a more complex effect on hysteresis brake load torque and is difficult to quantify As the brake heats differential ex
16. oltage If these fluctuations are undesirable for your application you should order the current regulated power supply MAGTROL Model 5210 2 F4 MAGTROL Model 5200 Power Supply E ox 9 ADJUST OFF POWER NA MAGTROL INC BUFFALO NY 120V 1A O e000 O 48 63 Hz 100VA FUSE 240V 1 2 A O Figure 7 Model 5200 Front and Rear Panels BRAKE MODEL 5200 2 CIRCUIT DESCRIPTION Hysteresis brake control power must be in the form of direct current The transformer bridge rectifier and filter capacitor provide a source of DC power from the AC line voltage Transistor Q1 is a PNP Darlington power device connected as an emitter follower to amplify the control potentiometer voltage setting CR2 is a transient suppression diode connected in parallel with the brake coil to absorb negative inductive surges AC INPUT Q1 gt 2N6668 gt P2 5 4 3 2 red 2 1 J4 wht blk red ADJUST P3 J3 1 red fs 5 R2 2 wht red 10 gm HH T 4 red 3 3 2 2 CRA vlt IDI5100H1 477 PM1 set for 240 Vrms by removing the fuse holder to access the inner module Then remove the small circuit board with the white tab The white tab is rotated and repositioned so that when the board and the fuse holder are reinserted the round point of the white tab now inserts into the small round hole on the fuse holder that is opposite the 240 V position
17. pansions cause dimensional changes that tend to increase torque Conversely the rotor s electrical resistivity increases with torque speed load resulting in decreased eddy current generation tending to decrease torque The time frame for these opposing factors is unmatched and variable Now toss in a few other things like thinning bearing lubricants Curie effects on magnetic materials and a precise evaluation of change in torque Vs temperature becomes very complex to define From torque stability Vs time at various HP levels tests we have found that where brake current and RPM remain fixed you may expect a gradual torque increase over a period of several minutes This increase will generally stabilize at approximately 0 596 per unit of torque per thousand RPM on smaller up to HD 500 dynamometers up to 1 5 per unit of torque per thousand RPM on the larger sizes 12 5 Power Supplies MODEL 5200 2 Torque is controlled by adjusting a ten turn ADJUST control that is located on the front panel of the 5200 2 power supply This control adjusts the output voltage to the dynamometer coil from O to about 34 volts DC Since this voltage is unregulated the dynamometer coil current will vary as a function of coil temperature resistance changes and line voltage As the dynamometer torque is proportional to power supply current the torque variation will also be a function of both coil temperature and line v
18. readout if applicable interconnections are straight forward using the cord sets Power supply options include the Model 5200 and the Model 5210 The 5200 operates in an open loop current control mode while the 5210 is a closed loop controller DYNAMOMETER LEVELING Level the dynamometer base plate in all planes The bubble level device on the base plate is convenient for front to back leveling For side to side adjustment it is more accurate to level the dynamometer by observing the torque dial for ZERO reading It works best to use the most sensitive torque scale by removing one or both of the counter weights Figure 1 Torque Scale Please note There should be nothing connected to the dynamometer shaft INITIAL CHECKOUT e Be sure the TORQUE control on the power supply is off CCW e Turn on the speed readout device if applicable and the torque controller e Rotate the dynamometer shaft by hand while simultaneously adjusting the TORQUE CONTROL clockwise very slowly You should feel resistance occurring on the shaft stop at this point If there is a speed reading instrument RPM indication should be observed e Return the TORQUE CONTROL to zero You may notice slight torque pulsations on the shaft with the TORQUE CONTROL off This is normal for a further description of salient poles please refer to Chapter 3 2 Dynarnorneter Specifications POWER DISSIPATION All Magtrol Dyna
19. sulate electrical internal and external motor connections well A power line short into the dynamometer base could pass a transient surge through all interconnected instruments and you too if you re not careful Always connect the motor frame to a high current capacity water pipe earth ground e Besure the motor control circuit breakers cannot be confused or tripped by accident at the wrong time Variable autotransformers are especially hazardous Someone plugs something in thinking that the transformer is set to zero but zap it s not VIBRATION All dynamometer rotating component assemblies are precision balanced However the dynamometer shaft has some overhang Overhang makes any assembly less stiff and more vulnerable to radial forces At high shaft speeds some vibration and noise are inevitable and not necessarily harmful However excessive resonant vibrations caused by bent shafts poor alignment out of balance couplings produce excessive data errors and a safety hazard Shaft couplings operating at speeds above their design limits are the worst hazard Many couplings contain somewhat loosely supported flexure elements When overdriven excessive centrifugal force may displace these out of axial alignment As this happens they immediately begin to absorb energy instantaneous severe vibration ensues and the various coupling elements may disconnect from each other go their separate ways spectacularly
20. tionally no liability is assumed for any damages that may result from the use of the information contained in this publication 1 Setting up the Dynamomefter UNPACKING After unpacking the dynamometer please check carefully through the packing material making certain that you have all dynamometer hardware applicable power supplies and any other small items Retain the carton s until you are sure that there is no shipping damage If there is evidence of damage please notify the carrier and Magtrol Customer Service as soon as possible Install the dynamometer counter weights They may be wrapped separately or installed on the brake Remove any tape or packing material around the brake or weights There should be as many weights 2 or 3 as there are torque scales on the dynamometer dial including the minimum scale weight permanently attached to the brake assembly The dynamometer brake assembly should swing freely INTERCONNECTIONS If an optional speed reading instrument or Model 5400 Tachometer is supplied with the dynamometer there will be two integral cord sets These include a 14 Pin for the tachometer generator and a 2 Pin for the brake control power supply If there is no speed reading capability the 14 Pin cable and internal tachometer generator are omitted You may add these yourself at anytime contact Magtrol Dynamometer Sales Connect all items together The dynamometer controller and speed
21. uations in either the AC line voltage or resistance changes within the dynamometer coil are greatly reduced Other secondary factors that affect torque stability described on page 21 will still apply The 5210 2 is universal for all Magtrol Dynamometers However because of the wide range of full scale current requirements O to 164 amps HD 106 to 0 to 700 amps HD 705 a three position current range control provides improved torque resolution control The three settings HIGH MED and LOW determine the full scale current level of the power supply Full scale for the HIGH MED and LOW ranges are 1 0 0 5 and 0 2 Amps respectively The digital panel meter indicates the current output level to within plus or minus 1 Starting on the LOW current range with the ADJUST knob set fully counter clockwise zero current increase INC current until the desired torque is obtained Select the next higher RANGE as necessary to obtain this torque There are three dash number variations of the 5210 series of power supplies each with a different maximum voltage output The 5210 1 is 90 volts 5210 2 is 24 volts and the 5210 3 is 12 volts All dynamometers are designed with a 24 volt coil therefore the 5210 2 is the only power supply you should use with a dynamometer The 5210 1 and 5210 3 are for use with MAGTROL brakes and should not be used with a dynamometer The 5210 2 is shipped wired for 120 Vrms power Line voltage can be set for
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