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a r r ir I Preliminary Tests r--�� " VLrE _ °n DHM VALUE��„� MEGADNM YALtlE COND[n0�f DFMOTQR Afffi SUPPLY How to Measure What it Means Motor not yet Installed VOLTAGE By means of a voltmeter which has When the motor is under load the 2 000,000(or more) 20 New Motor been set to the proper scale measure voltage should be within t 10%of the t 11,000 000{or mote tJ V,4�1 Z0 Z& Used iotorawhlch can tie rel sn taffed fn ilia well a � � l the voltage at the control box Onsingle nameplate voltage Larger voltage I Motor In well(Ohm readings are for drop cable plus motor) Q phase units measure between line and variation may cause winding damage I Soo 000 1 000 000 05 10 A motor in reasonably good condition neutral — 4 F . ,� -sem¢i t r, x a �mr aw � ra u k s �y� Large variations in the voltage indicate 20,000-500,060 -,o 02,0 5 e A motor whit may;have beers�damagedrliy rightrting of watt damaged a poor electrical supply and the pump � tT� $ '$ ' R� leads Uo hat puff the puhTp for this reason/;:__, should not be operated until these fi 10 000 20 000 001 002 A motor which definitely has been damaged or with damaged cabte variations have been corrected The pump should be pulled and repairs made to the cable or the motor replaced The motor will still operate but probably not for long If the voltage constantly remains high less 1han110,000, `'"1ij'-1OF` f"*5 0 DA motor w"filchtf as lel r whf completely,destWe—d katals I sula't€ori; or low,the motor should be changed to I � Ft" e jThe',purrip'musf a puflea and the c.&I9'repa:red oaths molar��phi*' the correct supply voltage �w, , � eeplaced Theiinotor will not rti6 in this condibon'„ CURRENT How to Measure What It Means I A PDoes Not Run MEASUREMENT By use of an Pump ammeter set on the proper If the amp draw exceeds the listed 9 scale measure the current on each service tactor amps (Si check for power lead at the control box See the the following PossreLe cnusl How ra CHECK How 70 CORRECT Electrical Data Table C,for motor amp 1 Loose terminals in control box or 1 No power at pump Check for voltage at panel If no voltage at panel check feeder O draw information possible cable defect Checkwindmg panel panel for tripped circuits l - Current should be measured when the and insulation resistances 2 Fuses are blown or Remove fuses and check for continuity Replace blown fuses or reset Circuit 1 pump is operating at a constant f circuit breakers are with ohmmeter breaker if new fuses blow or circuit 3 Toa high or low supply voltage tri ed breaker tris the electrical installation discharge pressure vnth the motor fully I PP P loaded 4 Motor windings are shorted and motor must be checked 5 Pump is damaged caussng a motor 3 Defective controls Check all safety and pressure switches Replace worn or defective parts overload for operation Inspect contacts in I control devices 4 Motor and/or cable are Turn off power Disconnect motor leads If open motor winding or ground is WINDING How to Measure What it Means defective from control box Measure the lead found remove pump and recheck RESISTANCE Tum oft power and dtsconnectthe drop If all the ohm values are normal andthe to lead resistances with the values at the surface Repair or replace ohmmeter(i Measure lead to motor or cable cable leads in the control box Using an cable colors correct the windings are JJ ground values with ohmmeter ohmmeter, set the scale selectors to not damaged If any one ohm value is ] (Rx104K) Record measured values LlJ Rx1 forvaluesunder loohmsand i less than normal the motor may be 11 5 Defective capacitor Turn off the power then discharge If there is no needle movement for values over 10 ohms shorted if any one ohm value is greater capacitor Disconnect leads and replace the capacitor O than normal, there is a poor cable check with an ohmmeter Rx100K Zeroadfustthemeterandmeasurefhe { } 9 resistance between leads Record the connection or joint The windings or When meter is connected the values cable may also be open If some of the needle should Jump forward and ohm values are greater than normal and slowly drift back Motor resistance values can be sound some less, the drop cable leads are in Electrical Data Table C Cable mixed To verify lead colors see resistance values are in Table D resistance values in Electrical Data i Table C INSULATION How to Measure What it Means RESISTANCE Turn off power and disconnect the drop For ohm values refer to table below cable leads in the control box i an Motors of all Hp, voltage phase and IMohm or mega ohmmeter,set the scale cycle duties have the same value of o selector to Rx 100K and zero adjust the insulation resistance I! a meter Measure the resistance between the lead and ground(discharge pipe or well casing if steel) I - Page 7 Page 8