OM3070 Operation - Section 30 Operating Instructions Page 30-19 GETTING ON LINE When operating a trolley truck, follow the procedure listed below to get on the trolley line. 3. Once aligned and moving 6 mph or faster, move the master control lever forward to one of the four speed control positions. This will start the trolley sequence and the ready for trolley indica tor light should come on. The pantograph will also raise to contact the overhead cables. After the pantograph is in contact with the cables for two seconds and the trolley sequence is com plete, the wheel motor power will switch from the engine driven alternator to the overhead power cables.
The overhead indicator light for on trolley should come on and the ready for trol ley should turn off. The trolley contactors will pick up and the system will start a notching sequence. Because of the higher voltage the stepping (notching) is necessary to give a smooth acceleration without exceeding the lim its of the wheel motors. This smooth conversion from diesel to trolley is called blended transition. This transition reduces the chances for wheel motor flashovers, contactor arcing, and mechanical shock to the motor housing frame, gears, etc. 1. Approach the trolley line equipped portion of the haul road at 7 to 10 mph to allow for smooth transition into trolley assist propulsion.
If speed of the truck (in diesel mode) is below 6 mph, the trolley system will not start the trolley sequence. Increase speed and accelerate to 6 mph. Suffi- cient distance must be allowed between trucks to prevent overloading of the trolley line electri- cal supply system and/or conductors and trucks being rejected from the trolley line. 2. Align the truck with the entrance area of the trol- ley line system when entering the overhead cables for trolley. The operator should center the truck with the cables as he enters the trolley pick up area. NOTE: The center of operation is approximately the center of the truck.
Centering or aiming the truck may be accomplished by aligning the center of the operator with the yellow navigational aid fitted on the trolley cantilever arms. This aligning technique is to be used for all operation on the trolley system. NOTE: The latch release on the master control lever must be moved and held when moving the switch into or out of the DIESEL position.