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How to monitor the Safe Torque Off in Power Brick LV


Yiven
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The Power Brick LV does not exhibit an amplifier fault in the motor status when the STO is triggered, it is strongly advised to issue a kill to all active motors as soon as the STO is triggered. This can be done in a background PLC. It is suggested to wire the STO feedback to input#1 of the Power Brick LV.

 

See the "STO" section of the "Power Brick LV User Manual" for implementation details.

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  • 6 months later...

Dear steve.milici,

 

I saw the 'STO' section of the "Power Brick LV User Manual" and I got confused in 3 points.

 

1) Is the 'STO feedback' mentioned the same as 'STO Out (pin #1)'?

2) When you say "It is suggested to wire the STO feedback to input#1 of the Power Brick LV". Is the input#1 the Digital Input pin1 'X15: D-sub DC-37F'?

____

3) (Assumed STO feedback the same as STO Out)

It seems the 'recovering from the STO' suggested PLC code has mistakes in the conditionals sentences

 

OPEN PLC STOResetPLC

LOCAL Mtr1PrevI2TSet;

IF (Input1) // I think this should be 'IF (~(input1))' once STO Out has 0V in failured condition

// STO ENGAGED?

{

IF (Motor[1].I2tSum > 0)

// I2T CHARGED?

{

KILL 1

Mtr1PrevI2TSet = Motor[1].I2TSet

DO {Motor[1].I2tSet = 0} WHILE (Motor[1].I2tSum > 0)

Motor[1].I2TSet = Mtr1PrevI2TSet

}

WHILE(Input1){} // Same here

}

 

 

Thanks in advance,

Guilherme

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