vectrostar r25 - r65 - r120 - VEM motors Finland Oy

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II)Commissioninga) Introduction* Important note:To be definitive, the dosing must be done onsite, in the most difficultstarting conditions. Even if the starting is exceptionally done loaded, itis necessary to have these conditions for the adjustment.b) Measuring instrumentRemark: The rotor voltage of a ring motor is equal to U r (rotor locked). This valueis indicated on the motor plate.As the motor is speeding up, U r decreases, aiming at a low voltage at the end ofstarting (lower than 6% of U r written on the plate).The best way to follow the speed variations of the motor is to measure thevariations of the rotor voltage.Connect a voltmeter between two of the three starter bars.‣ The voltmeter calibre must be compatible with the maximum alternativevoltage U r (see motor plate).c) Preparation of the electrolyteATTENTION :‣ Do not pour the electrolyte into the starter right after the preparation.‣ Electrolyte is a dangerous chemical.⇒ Handle with care.⇒ Put on gloves. In case of contact with the skin or the eyes, rinseabundantly and take medical advice.In a water bucket, pour soda gradually according to the following table:R25 R65 R120 R200Quantity of water (l) ½ 1 1 2Quantity of electrolyte (g) 250 500 500 1000It should be observed that during the dilution, an exothermic reaction occurs. Themixture temperature can rise up to 90°C.Let it cool down.Once the mixture has cooled down, pour it into the dosing bottle according to the followingfigure.
d) Time relayDuring the tests, adjust short-circuiting time relay to the higher value in order to avoidany undesirable short-circuiting.e) DosingFirst, test the starter with water only (without soda) and measure the variations of therotor voltage.‣ If the rotor voltage gets stabilized or does not decrease, stop the startingsequence within 5 seconds.Note the voltage value as:test without soda: Ur water =….Make sure that motor works properly. (ie: the motor is stopped, or runs then getsjammed or runs without speeding up)Switch off the power.Add some of the electrolyte preparation according to the following table:VectroStar R25 2 doses (50 ml) 25g of sodaVectroStar R65 4 doses (100 ml) 50g of sodaVectroStar R120 8 doses (200 ml) 100g of sodaVectroStar R200 16 doses (500 ml) 200g of sodaSwitch on the pump during 100 sec. (mixing of the bath).Switch on the power.Test the motor then repeat the procedure at : «Note Ur xg = …. » ….and so on, for sometimes.When following this procedure, the rotor voltage is getting lower. The aim is to get a rotorvoltage, lower than about 6% of Ur from the motor plate at the end of the end of thestarting sequence.When you hit the target, adjust the short-circuiting delay with a safety margin and withoutswitching on the power side.T (short-circuiting) = T (to go down to 6% of Ur) +5 sec.Check the tightening of the power cables.Secure the flow and recycling valves.Pour the bottle of electrolyte anti-evaporation oil.Close the fill-up hole and carefully replace the lid on the starter with its fastening belt.You are now ready to go !!!
Page 4 and 5: A - NOMENCLATURE - USE OF EACH PART
Page 10 and 11: I) PrincipleD - PARTICULAR CASES OF
Page 12: F - APPENDIXES

vectrostar r25 - r65 - r120 - VEM motors Finland Oy

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