Wiring method of load cell

There are two ways to wire out the load cell: 4-wire and 6-wire. There are also 4-wire and 6-wire wiring for the module or weighing transmitter. Whether to connect 4-wire or 6-wire depends on your hardware requirements. , The principle is: if you can connect to 6 wires, don't connect to 4 wires, and if you must connect to 4 wires, you must short-circuit.

General sensors are in six-wire system. When connected to four-wire system, the power cord (EXC-, EXC+) and feedback line (SEN-, SEN+) are short-circuited respectively. SEN+ and SEN- are used for compensating circuit resistance. SEN+ and EXC+ are connected, and SEN- and EXC- are connected.

EXC+ and EXC- supply power to the load cell, but due to the line loss between the weigh module and the sensor, the voltage received by the sensor will actually be less than the supply voltage. Each load cell has a characteristic of mV/V. The mV signal it outputs is closely related to the received voltage. SENS+ and SENS- are actually a high-impedance loop in the weighing module. The received voltage is fed back to the weighing module. Assuming that EXC+ and EXC- are 10V, the line loss is 0.5V, and the sensor is 2mV/V, the actual sensor output signal is 19mV instead of 20mV. At this time, the weighing module will take 19mV as the maximum range, provided that the sensor must feed back the actual voltage to the weighing module through a feedback loop. Short-circuit EXC+ and SENS+ on the weighing module, and short-circuit EXC- and SENS-. This is limited to situations where the distance between the sensor and the weighing module is very small and the voltage loss is very small, otherwise the measurement will have errors.