OM3050 7/09 Operating Instructions - Section 30 Page 30-13 Operating on trolley Getting off line As the truck approaches the end of the trolley line, it must exit the line properly. There will be signs or sig- nals near the end of the line indicating to the operator to exit the trolley lines. 1. The directional control lever must remain in the T position while on trolley. 2. Truck speed is regulated by throttle pedal position. 3. If stopping or rapid slowing is required while on trolley, release the throttle pedal and depress the retarder/brake pedal as necessary. This action will lower the pantograph and the truck will switch back to diesel mode. NOTE:
The overhead cables taper upward as the truck approaches the end of the line. If the proper drop out sequence is not started at the right location, the truck will drive out from under the cables with the pantograph still up. This will cause damage to the pantograph because of the arcing that will occur. 4. If the current leakage circuit detects a short between the overhead trolley system and the truck chassis, the pantographs will lower and the truck electrical controller will switch back to diesel mode. 1. At the designated location, the operator must press the pantograph switch to lower it, or move the directional control lever from T to F.
This will start the change over process from trolley mode to diesel propulsion mode. 5. While on trolley: If something happens to cause the trolley to reject, the pantograph will lower and the truck will return to diesel power. 2. Truck speed will decrease, and the engine speed will increase to high idle. If the pantograph becomes disconnected from the trolley line for any reason, the pantograph will lower and the truck will return to diesel power. 3. The drive system will cut over to diesel propulsion mode as smoothly as possible. The Status Monitor Panel indicator light for “Pantograph Energized” and “Pantograph Up” will turn off.
If the brake/retarder pedal is used while on trolley, the pantograph will lower and the truck will return to diesel power. 4. After the pantograph is fully retracted, the operator can steer the truck out from under the trolley cables. If the truck speed drops below 8 kph (5 mph) while on trolley, the pantograph will lower and the truck will return to diesel power. In the event an operator is required to get off of a trol- ley line to drive around an obstruction, such as rocks or disabled equipment, the operator will follow the procedure for getting off line, drive around the obsta- cle and follow the procedure for getting on line.
To obtain trolley operation again, ensure the truck is properly aligned under the power cables. With the directional control lever still in the T position, the operator can press the pantograph switch to raise it and try to connect again. The truck speed must be over 8 kph (5 mph) before this sequence will be completed. DO NOT touch the trolley assist lines unless the system has been de-energized and grounded by qualified electricians. Only persons who have been properly trained and are qualified to perform the lock-out and grounding will be authorized to isolate the line or lines.
Such authorization will be made in writing by the electrical engineering or electrical mainte- nance departments. DO NOT operate the truck on the trolley line if the truck trolley system is not working correctly.