SAE J3053:2019 pdf free

SAE J3053:2019 pdf free.Heavy Duty Truck and Bus Electrical Circuit Performance Requirement for 12/24-Volt Electric Starter Motors
Starter solenoid current draw varies widely based on the type of starter engagement system. Robust control circuit design is critical to the starter engagement reliability and solenoid life. Although still important, the control circuit design for starters equipped with IMS (integrated magnetic switch) is less sensitive to voltage drop based on the relatively low-current draw of the IMS coil (approximately 2 to 4 A). For starters, without IMS, the control circuit consists of the wiring from the battery power source to the magnetic switch, the magnetic switch contacts, and the wiring from the magnetic switch to the starter solenoid (see Figures 8 and 9). Vehicles with electronically managed starter controls shall consider protection for inductive voltage spikes resulting from de-energizing the starter solenoid. Likewise, the system design should ensure that (if) a control relay exists on the starter, that suppression is present on the coil of the relay, which will ensure ample protection exists at the source where such inductive voltage spikes would be generated.
●Voltage drop measurement shall be performed by applying a current suitable to the operating current level of the starter solenoid or IMS during the initial engagement phase.
●Magnetic switch shall be energized to perform total circuit voltage drop measurement. (Disconnect circuit from starter motor prior to performing measurement.)
●Measurements should be performed quickly to minimize changes in circuit resistance due to |2 X R heating effects.Figure 10 describes several different engagement system types and provides recommended values for V-drop/100 A,as well as the equivalent resistance in ohms.
●The starting motor control circuits in motor vehicles shall be designed so that the difference between the voltage at the battery terminals and the starting motor control circuit terminals (including connections) shall not exceed those values shown in Figure 10. The voltage drop values are defined with a normal circuit temperature of 20 °C (68 °F).SAE J3053 pdf free download.