CONTROLS AND INSTRUMENTS

ARMY TM 9-6115-464-12 AIR FORCE TO 35C2-3-445-1 NAVY NAVFAC P-8-624-12 n. o. p. q. r. s. t. u. v. w. x. Y- z. aa. ab. ac. 2-2 Overload lndicator (13, Figure 2-1). The overload indicator is an indicator Iamp with a red lens. It illuminates when the load on any phase reaches 130% of rated Ioad and the overload protective device actuates. Under Voltage Indicator (14, Figure 2-1). The under voltage indicator is an indicator lamp with a red lens. It illuminates instantaneously when voltage drops below 48 volts or 6 ± 2 seconds after voltage drops to 99 ± 4 volts (tactical precise generator sets only). Under Frequency lndicator (15, Figure 2-1). The under frequency indicator is an indicator lamp with a red lens. For ModeI sets in 60 Hz operation, it illuminates when frequency drops to 55 ± 1 Hz. For Mode I sets in 50 Hz operation, it illuminates when frequency drops to 46 ± 1 Hz. For Mode II sets, it illuminates when frequency drops to 370 ± 5 Hz. This indicator is operational on tactical precise sets only. Reverse Power Indicator (16, Figure 2-1). The reverse power indicator is an indicator lamp with a red lens. It illuminates when reverse power exceeds 20% and the reverse power protective device actuates. Over Voltage Indicator (17, Figure 2-1). The over voltage indicator is an indicator lamp with a red lens. It illuminates when voltage exceeds 153 ± 3 volts and remains for 180 milliseconds and the over voltage pro- tective device actuates. Fault Indicator Fuse (18, Figure 2-1). The fault indicator fuse is 1-1 /4 x 1/4 inch, glass, 1 amp, 250 volt fuse. It protects the fault indicator circuits from overload. Test or Reset Switch (19, Figure 2-1). The test or reset switch is a single pole, momentary on, toggle switch. It permits testing of the fault indicator lamps and resetting of fault indicator lights. DC Circuit Breaker (20, Figure 2-1). The DC circuit breaker is a push type circuit breaker. It closes the 24 Vdc circuit from the battery to the controls. The DC circuit breaker is depressed (closed) during genera- tor set operation. Manual Speed Control (21, Figure 2-1). The manual speed control is a push-pull control. It controls en- gine speed and thereby frequency output. A vernier type adjustment allows finer control. This control is inoperable on precise models of the generator set. Battle Short Switch (22, Figure 2-1 ). The battle short switch is a four pole on-off toggle switch. It is pro- tected by a plastic guard. It permits emergency operation by bypassing the protective devices circuits (with the exception of the overspeed and short circuit). The battle short switch also locks out the starter circuit. During normal operation, the battle short switch is in the OFF position. Battle Short Indicator (23, Figure 2-1). The battle short indicator is a press-to-test indicator lamp with a red [ens. It illuminates when the battle short switch is moved to the ON position and the generator set is operating. Voltage Adjust Rheostat (24₁Figure 2-1). The voltage adjust rheostat allows adjustment of the generator set output voltage. Synchronizing Lights (25, Figure 2-1). The synchronizing lights are indicator lights with clear lens. They indicate the synchronization of frequency when the operation switch is placed in the PARALLEL position for paralleling of the generator sets. Operations Switch (26, Figure 2-1). The operations switch is a four pole, two position, toggle switch. It is placed in the single unit position for single unit operation and in the PARALLEL position for parallel operation. Voltage Sensing Switch (27, Figure 2-1). The voltage sensing switch is a double pole, two position toggle switch. It permits either local or remote monitoring of the voltage regulator circuit. Panel Light Switch (28, Figure 2-1). The panel fight switch is a single pole toggle switch. It controls the panel illumination fights.