1、test the weighing sensors of belt scale

( 1 ) In terminal 15 and 16 is connected to the AC voltage meter
( 2 ) When stooping the conveyor,the output is 0 VAC;
( 3 ) When starting belt scale,the output is about 3 VAC,the output of using the encoder as speed sensor;
is associated with the power supply,but not more than the power supply voltage;
( 4 ) If there is no voltage,it should be repaired or replaced;
( 5 ) Check whether the working power supply and power line is normal.

2、check weighing sensors through resistance

Belt scale uses precision strain gauge load sensor,with a sensitivity about 3 MV/V,applying the following procedure to prove its performance.

( 1 ) Check whether the terminals 1,2,3,4 and 7 are disconnected;
( 2 ) When using an ohm meter,check both ends of the resistance of 1 and 2,3 and 4,the resistance should be 350Ω±2Ω;
( 3 ) Check the terminals 7 (shield) and the resistance of 1,2,3,4,the resistance should be infinite,that is open;
( 4 ) If the checked resistance is incorrect,you should check the cable lines of weighing sensor.

3、check weighing sensors through millivolt meter

Use DC voltage meter which can read the millivolt signal to prove the performance of weighing sensors connected line of belt scale.

( 1 ) Complete the checking of the resistance;
( 2 ) Through the integration 4 (-) and 3 (+) to check the voltage for the bridge that should be 10V±5%;
( 3 ) If there is no voltage for the bridge,remove the field wiring,re-examination,if still not,should be repaired or re-examine the display controller;
( 4 ) Through the terminals 1 (+) and 2  (-) to measure DC millivolt voltage;
( 5 ) The reading must be between 0~30Mv DC;
( 6 ) The output of the millivolt signal  is directly related to the applied weight,the output signal is also increased when the weight increases the output signal is also increased.