ROD AS 4531014 - Caterpillar

Table 1
Insulation Class     F     H    
Ambient temperature    
40° C (104° F)    
40° C (104° F)    
T = temperature rise (resistance method)    
105° C (221° F)    
125° C (257° F)    
Difference between the hottest point and the average temperature    
10° C (50° F)    
15° C (59° F)    
Total: Temperature of the hottest point    
155° C (311° F)    
180° C (356° F)    Note: If the generator is exposed to winding temperatures above the values listed in Table 1, the service life of the insulation and service life of the generator is reduced substantially. A high operating temperature can cause the generator to melt insulation and short the windings causing a fire.Thermal Protection for the Bearings
Temperature sensors are available for installation on the bearings. The sensors are to protect the bearings from damage due to overheating.Alarm and Shut Down
The temperature parameters for unit alarm and shutdown must be set as low as possible. The temperatures can be determined based on the results of tests or by the operating temperature of the generator. The temperature for initiating an "Alarm" should be set as follows:
10° C (50° F) above the operating temperature of the generator
While at full load
Consider the highest ambient temperature where the unit is installedThe temperature that will cause a shutdown must be set to a lower temperature than the temperatures listed in Table 2 and Table 3.
Table 2
Stator Winding (1)    
Class of Insulation     Maximum temperature of protection setting    
Alarm Shut down    
F    
140° C (284° F)    
155° C (311° F)    
H    
155° C (311° F)    
180° C (356° F)    
( 1 ) Maximum temperature of stator - continuous dutyNote: The temperature for generators that are used in emergency standby systems can be allowed up to 25° C (77° F) above the temperature for continuous operation. The allowance in temperature per the standard NEMA MG 1 and MG-22:40-1- 22.84. Generators that are installed in higher temperature conditions reduce the service life of the generator.
Table 3
BEARINGS    
Maximum Temperature Setting    
Alarm     Shut down    
110° C (230° F)    
120° C (248° F)    Space Heater
Some generators are equipped with a heater to prevent condensation of water that can occur due to long periods without operation. The heater must be programmed to turn on after the shutdown of the generator and turn off before the unit is placed into operation. The required power for the space heater is shown on the identification plate that is located on the generator.Note: If the space heater remains energized while the machine is in operation, generator windings may be damaged.Auxiliary Winding Protection
The generator uses a fuse to protect the auxiliary winding and/or the voltage regulator against overload. The fuse is connected in series with the auxiliary winding and/or the voltage regulator.Note: Failure to use the specified fuse may result in burning of the auxiliary coil and the stator winding.If