Technical Details
ZiU-5 is a high-floor big class trolleybus for city mass transit. It's duraluminium hull mounted on the steel frame and carcass constructions. The hull has two doors in its front and rear ends. The doors open and close automatically by electric gear under driver's control. The vehicle is powered by DK-207A 95-kilowatt electric motor. The current regulation system (controller unit) is an automatic indirect one. All commutation of power-circuit resistors is performed by a low-voltage electric servomotor. These resistors limit the electric current through the main motor and, therefore, regulate its speed and torque. ZiU-5 is equipped with motor-generator for transformation of the input DC high voltage (550V) to low service DC voltage of 24V. This transformation is quite simple - 550V electric motor has coaxial connection with 24V electric generator. However, the drawback of this simplicity is a constant noise of this device. However good oilment and centring procedures can reduce this noise to tolerant level. The low voltage subsystem includes mentioned above controller unit, internal and external lights, door gear and two accumulator batteries. Due to differentiating voltage levels the hazard of electric shock to driver and passengers was reduced greatly. All electric devices inside passengers' saloon and driver cabin are supplied only with safe 24V voltage. Power 550V circuits are placed under the floor. The brake system includes electrodynamic, mechanical and pneumatic brakes. The pneumatic brake has the electric compressor unit to maintain the pressure in air reservoirs.
ZiU-5 has 38 passengers seats and is able to transport 122 persons with full load. The maximal speed is limited by 68 km/h, but some drivers were able to accelerate the vehicle up to 100 km/h without passengers.
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