Table 2-1. Power Requirement Chart

TM 9-4910-663-34 Table 2-1. Power Requirement Chart Condition Speed KVA at 230/460V Starting Locked rotor 166.0 35 HP (intermittent) 1000 RPM 37.1 9000 RPM 39.3 22 HP (intermittent) 1000 RPM 24.9 9000 RPM 26.4 To determine input current requirements, use following formula: I = KVA (Amps) 1.73V (Line) When connected to a power source of less than 230/460 volts, continuous rating remains at rated HP, provided that the voltage reduction is not more than 10%. However, intermittent duty overload rating should be reduced in direct proportion to the square of percent reduced voltage to nominal voltage. For example: Nominal volts = 230 Reduced voltage = 210 210/230 = 0.913 (0.9132)² = 0.8336 New intermittent duty rating = 35 HP X 0.8336 = 29.2 HP (2) The test stand can be operated from a diesel-engine generator source of power if the input to the test stand is regulated and maintained at 230/460 volts, 60 Hz. For diesel-engine generator operation, note the following: (a) Compensation for the low voltage starting condition associated with a diesel-engine generator is provided by using a low voltage coil for starting and a voltage dropping resistor in series with the coil for running conditions. (b) If the nominal output voltage of the diesel-engine generator is less than 230/460 volts, the power delivered by the output shafts is reduced as shown in table 2-1. b. Site Selection. Ensure that the selected installation site for the test stand is dry, free from moisture drips, and clean. The selected site should also be in a cool, ventilated location that is free from hazardous processes. Outline dimensions o-f the test stand are shown in figure 2-2. Change 1 2-3