ELECTRICS 2.19 LONGITUDINAL STABILITY INDICATOR Description The Longitudinal Stability Indicator (LSI) monitors the forward stability of the machine. The LSI provides audible and visual signals in order to alert the operator to the condition of a loaded machine. The electrical signal that is sent from the sensor to the display module is proportional to the strain that is applied to the sensor. The sensor is subject to the same strains that are applied to the rear axle. These strains depend on the weight of the load that is carried on the work tool and the amount of boom extension. The main components of the LSI are a sensor (2) and a display module (1).
The sensor is mounted on the rear axle and the display module is located inside the cab on the cab right side console. An intermediate harness (3) connects to the display module connector (5) and the sensor. The intermediate harness is routed from the space between the rear of the cab and the hydraulic control valve through the cab to the instrument panel. The LSI is powered by the machines electrical system and power is supplied to the display module through a connector (4). The following power supply table shows the power supply required to operate the LSI. The current will depend on the load that is indicated on the display module (1).
The LSI is activated when the engine start switch is turned to the ON position. The sensor sends electrical signals to the display module which then provide the operator with audible and visual signals. The display module attempts to simulate the load chart for the machine. Power Supply Nominal Voltage 12 Volts DC Voltage Range 10.5 Volts to 15.5 Volts Current 100mA to 300mA (1)