COVER-AIR COMPRESSOR 7N7441 - Caterpillar

Description
Illustration 1 g01284724
(1) Transformer "T1"Transformer "T1" (1) is a multitap transformer that provides AC power to the Power Distribution Board and the Flywheel DC bus precharge circuit. Transformer "T1" (1) is supplied from the protected output of the UPS. The thermistor for "T1" is located on the top side of the transformer. The thermistor is connected to the "H1" connector of the transformer. Refer to Illustration 1 for the location of the thermistor.
Table 1
Specifications for the Thermistor    
    Size     Ohm    
T1     35mm     10    
Table 2
Specifications for the Transformer    
    Input (V)     Output (V)     Wire Gauge (AWG)    
T1     380, 400, 415, 440, 480     190, 230, 530     10-22    The transformer is installed on the lower left panel of the cabinet. Refer to Illustration 1 for the location of the transformer.Removal Procedure for the Thermistor
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Internal Component Preremoval Steps (Flywheel Cabinet)" in order to shut down the system and gain access to internal components.
Remove the two screws that attach the thermistor to the terminal block.
Remove the thermistor from the terminal block.Note: One screw is attached to the "H1" terminal connector and one screw is attached to the "COM" or the terminal connector that is not labeled.Installation Procedure for the Thermistor
Place one lead of the thermistor into the "H1" connector. Place one lead into the "COM". Refer to Illustration 2.
Tighten the two screws in order to attach the thermistor firmly.Removal Procedure for the Transformer
Illustration 2 g01284764
Wire Connections for TransformerRefer to Systems Operation, Testing and Adjusting, RENR7654, "Internal Component Preremoval Steps (Flywheel Cabinet)" in order to shut down the system and gain access to internal components.
Remove the lower metal shield.
Remove all wires from the transformer.
Remove the screws that hold the transformer to the panel. The screws are located at the corners of the transformer.
Remove the transformer from the cabinet.Installation Procedure for the Transformer
Position the transformer on the lower left panel at the bottom of the cabinet.
Install the transformer to the lower left panel.
Connect the wiring to the transformer. Refer to Illustration 2.
Install the lower metal shield on the cabinet for the flywheel.