Figure 5-15. Control Relay Assembly TB10, Test Setup

Figure 5-16. Annunciator Control Assembly, TB6 (Sheet 1 of 2)

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 a. Test. Test by disconnecting one lead from each resistor. With an ohmmeter, check each resistor for 7.5 ohms 0.5 percent. b. Replacement. Remove resistors by unsoldering leads and removing from clips. 5-6. ANNUNCIATOR CONTROL ASSEMBLY TB6 (76, figure 5-1). The annunciator control relay assembly contains four terminal boards, 20 diodes, and 13 relays: REF DES FUNCTION K25A Alarm Silence K25B Alarm Silence K26 Alarm Arming K27 High Coolant Temperature K28 High Oil Temperature K29 Low Oil Pressure K30 Low Fuel Level K31 Overspeed K32 Overvoltage K33 Undervoltage K34 Reverse Power K35 Overload K36 Short Circuit a. Test. (1) Check each relay using test circuits shown in figure 5-16. Energize each set of relay contacts individually by applying 24V DC directly to leads. Check for open or closed contacts (no continuity or continuity) as indicated in figure 5-16. Check that each set of contacts revert (to either closed or open position) when deenergized. If only relay fails to either open or close as indicated, it is defective and must be replaced. (2) Check diodes for polarity. A good diode will read high resistance one way and low resistance the other way. A defective diode will read full scale both ways, or will read infinity (no reading) in either direction. (3) Check terminal boards and printed circuit wiring by repeating steps (1) and (2), but apply 24V DC to TB6 terminals. b. Repair. If any of the relays or diodes are defective, Annunciator Control Relay Assembly TB6 is repairable by replacing the defective Figure 5-15. Control Relay Assembly TB10, Test Setup 5-18

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