TM 5-6115-545-34Figure 3-4. Control Cubicle Transducer, Test Setup3-9. Frequency Meter and Transducer Test.To test the frequency meter and transducer of the controlcubicle, proceed as follows:NOTE3-10. Control Box Relay Testing.To test the control box relay assembly of the control cubicle(see figure l-l) and proceed as follows:CAUTIONThe frequency meter and transducer are amatched set and must be tested as a set.a. Connect a variable frequency 120 Vac sinusoidal input—to the ac side of the frequency transducer,b.Connect a master frequency meter across the input.The master frequency meter shall have inaccuracy of aminimum of 3/4% or greater of the set frequency meter andtransducer (l/20 of l percent).c.Vary the frequency from lowest scale reading to fullscale reading.d.The error at any point infrequency meter shall not begreater than l percent.e.If the above requirements are not satisfied, replaceboth the frequency meter and transducer.When applying the 120 Vac to control box relayassembly terminals, insure correct placement ofpower supply leads. Damage to other com-ponents could result if leads are inadvertentlymisplaced.a.With no power applied, check continuity across follow-ing terminals of the control box relay assembly: terminals10 and 11; 5 and 6; and 1 and 3 (fig. l-l).b.Apply a dc voltage of 24 volts to terminals 2 and 8.The normally open contacts between terminals 7 and 9, andthe normally closed contact between terminals 1 and 3should transfer (fig. l-l).c.Apply an ac voltage from 50 to 80 volts, 50/60 Hz or400 Hz to terminals 4 and 12. The normally open contactsbetween terminals 4 and 6, and terminals 10 and 12 and thenormally closed contacts between terminals 5 and 6, andterminals 10 and 11 should transfer (fig. l-l).3-6Change 8
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