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Hi everybody, I'm using an 2-axis system, p/n 6SN1118-1NH01-0AA0, controlled via profibus, p/n 6SN1114-0NB00-0AA2, by a 315DP PLC. The customer told us they keep getting A799 fault almost daily. I wrote some logic that allows the operators to re-reference the servo position (parameter 175) via...

Hi everybody, I'm using an 2-axis system, p/n 6SN1118-1NH01-0AA0, controlled via profibus, p/n 6SN1114-0NB00-0AA2, by a 315DP PLC. The customer told us they keep getting A799 fault almost daily. I wrote some logic that allows the operators to re-reference the servo position (parameter 175) via...

Sorry, It's a AC-DC converter. AC line voltage is 115/230, and it produces 0-90 VDC/0-180 VDC armature voltage...

hey guys, I'm using a 120/220VAC drive to power a 1/3 HP DC motor. I want to calculate the FLA. What's the formula??? Can I use this relatioship 1HP =746W =746x1Vx1Amp ? Thank you,

hey guys, I'm new in the field and I'm running into this basic problem that's giving a headache. I got a pneumatic slide that's supposed to go up and down. It's controlled by a double sol, 2 position (I'm pretty sure that's the type of valve on the machine now). The valve power is tied to a...

Hi everyone, What can cause a servo motor to lose its refernce position? I ran into a problem when my motor lost its home position. It showed that the slide was at home even though it was sitting in the middle position. I had to set the reference position again in Simocom U to get it to work. I...

NEC 2005 Aricle 409 requires SCCR rating label on control panel, so far 31 states have adopted this. I'm doing SCCR calculation on my panel (50 KA SCCR required) and have a very fundamental question: My panel has 2 transformers: one auxiliary disconnect and one control. The PRIMARY sides of...

I'm doing short circuit current rating for my panel as required ny NEC 2005, article 409 (first time doing this so please bear with me). I have some questions: 1) According to article 409, power transformer's not included in the SCCR calculation. Why ? and I assume this means that I don't have...

Does the current NEC say anything about who should be responsible for detailing the arc-flash labels on new equipment?

Normally, is it the OEM's responsibility to do arc flash calculation or it it more of the end user's ?

What's the easiest/quickest way to do arc flash calculation? Thank you

I used On Delay Timer, what's the symbol of the one-shots in Siemens look like again? Thanks,

I ran into another problem. The accepted code is made of the trigger byte and the "good" barcode scanned. The accepted code's used to open the safety gate. Now every time I scanned a good barcode, the logic opened the gate; but my timer wouldn't reset and the gate remained opened. I think I...

Thank you all. Jacekd, I manually entered (9), the number of valid character in my VAT table and got the compare function to work. Is modifying in the VAT table the right way/only way? What must I do to manually enter number of valid character in the strings to get the FC to work? Thank you...

Hi, I'm scanning a code from each box to compare and see if the box scanned is a "good" box. The whole code is about 21 bytes and I only want to compare 9 bytes since those 9 bytes differentiate between the 2 types of box. I created (2) 9-byte strings in DB98, string1[9] starts at 0.0 and...

Hi, I'm scanning a code from each box to compare and see if the box scanned is a "good" box. The whole code is about 21 bytes and I only want to compare 9 bytes since those 9 bytes differentiate between the 2 types of box. I created (2) 9-byte strings in DB98, string1[9] starts at 0.0 and...

I'm using a 460VAC/230VAC single phase transformer. My customer insists wanting to have 440VAC/220VAC one instead. The ratio between the two transformers are the same. How different are the two? Are they essentially the same ? Thank you,

Hi everybody, I recently graduated and currently work as an entry level electrical engineer and I wonder if you can give me some tips/rule of thumb when it come to sizing contactors. Thank you,