travish

Why do A/C units for Control Panels cost so much? Using Hoffmans online calculator, I need 6000 BTU's, would be using 480 vac, my quote was a little over $3000. My unit for my house didn't cost but $2500. You can buy a window unit from Lowes for $500. Does anyone know of a cheaper option? Travis

Anyone on here ever use the Murr/Mac MMM? It is a Mac Air Valve Manifold that has a Murr elektronics Ethernet adapter on it. My pnematic sales guy is wanting me to try it. Looks pretty clean and easy to use. I am wondering about how well (reliable) the E-net communication will be. By the way this machine has 5 resistance welding heads on it. Will the magnetic field generated by the welding cause a problem with the E-Net. Weld transformers are 120kva all firing simultaneous. Any help would be greatly appriciated Travis

thanks I went out and slowed the motion way down and tried to watch the input value progressing slowly, and it looks like the jumping that I occasionally see occurs at the transition from 0 to 10 may can get around this with a couple of less than and greater than. I will change the format and let you know Travis

I have a L35 Compactlogix using Numatics G3 fieldbus IO. The Numatics IO is 9 digital input modules, 3 output modules and 1 analog input module. The module is a 4 channel 0 - 10v input module. All of the digital IO works perfectly. Looking in rslogix5000 all of my data from the G3 system shows up as 32bit words, so there are 4ea 8 bit rows in each word. So the 4 analog inputs use 8 bytes, 2 bytes for each input. Each input is a 16 bit value, example word 11 11111111 11111111 11111111 11111111 word 12 11111111 11111111 11111111 11111111 My 1st analog input is the value of the last byte of word 11 and the 1st byte of word 12, the next input is row 2 and 3 of word 12 so how do i look at the value of input #1? Thanks for your help Travis

I am still doing something wrong. I incorrectly gave the word 11 and 12 last week, it is actually 12 and 13 for input 1. I moved to input 2 so that both Bytes of data would be in the same word. Open the attached program and look under the file called "Drives" on rung 31 is my BTD instruction. Looks like it works but something is not corect, because when watching it count i occasionally see a number way out of progression, like maybe it is counting around 50k and I see a 20k number flash up for just a second and then continue back at 50k. You will also see I added a few rungs under the BTD to make sure which BYTEs were counting. the analog input is a Turck RI360 rotory prox sw that should give 0 - 10. This works correctly when I check it with my meter, so I feel it is not the reason the count jumps around sometimes. I know it goes all the way to 10 and starts at zero, so notice under the BTD instruction it looks like the value never went below 214 or above 65276, Do you see anything I am doing wrong? thanks Travis Slat_Welder.ACD

thanks Bob, I will let you know how it worked Travis

If I understand you are basically running the conveyor at some speed thru the VFD and then stopping at some preset encoder count? Is that correct? Are you doing some kind of controlled stop or is the drive just coasting to a stop? Might not have anything to do with accuracy but why not use a high speed cntr instead of creating your own encoder logic? Travis

What are the Pro's and Con's of using voltage or current for an analog input. I am using a 1769-IF4 input module and Turck Ri 360 rotary inductive sensors, I will have 3 of the Turck sensors monitoring the rotary position of 3 axis. The sensors give the option of using Voltage or Current and the Module will accept either. So is one better than the other. I have used both in the past with no real issues, except on 1 application I was using an air pressure switch that had an analog voltage output (I think it was Sunx, but not sure) I did not get good repeatable readings. Is this typical of voltage inputs, or was my sensor the problem? Thanks Travis

"Put a 1/4 amp fused disconnecting terminal block on a convenient terminal rail so you can connect the meter and then open the fuse for testing" That is brilliant, some people are so smart, thanks for the tip

thanks guys, I like using the current inputs myself Travis

thanks guys, I already ordered the high dollar unit, next project I will check out the suppliers that you mentioned Travis

Our air is nasty, you can always find an air leak at our plant if it is blowing on something, it leaves a black oily film. Travis

Hey guys, I am building an automaticly fed resistance welding machine. We are going to make rebar mats that will have 5 longitudinal wires (spelling???) and 3 cross wires. The mats will be roughly 5 feet wide by 10 feet long. It will use 5 - 120kva transformers 480 primary to around 10 to 15volts secondary. Secondary voltage depends on the tap setting. So on the Supply side I am coming into the machine with 3 phase 500 mcm feeder thru a 400 amp breaker. Then need to break out the power to terminal blocks or a buss to tap the primary of the x-formers, and to feed 5VFD's (2hp largest) a 7 1/2 Ton Chiller. Don't have any Terminal blocks that large with that many wire terminals. Thought about using solid copper buss and just drilling holes and attaching like ground lug to the buss to make the connections, I really don't think I like this option. I guess I could use a panel board and use breakers to feed the devices. But I have never seen this done in a control panel. The panel is a 4 door approx 150" wide and 72" tall. Does anyone have any suggestions? Thanks Travis

Shiner, I like the idea of the buss bar with the crimp on connectors much better than with the ground lugs. BobB can you post a picture of what you are talking about I looked up the Erico links and saw what looked like hangers for the cable, How are ou terminating the cables? Travis

Just found it. it is under Legacy Primatives Thanks

Hey Guys, I am building a straighten and cut line for deformed wire, using a compactlogix and a redlion G310 operator interface, I would like to put a gauge on the main screen to show the speed. Trouble is I can not find a gauge in the options in Crimson 3. using panel builder it would be under graphic indicators/ gauge Can anyone help? Thanks Travis

I have a servo I am putting on a machine, using a ML1500 with a 1769-IQ16. I want a servo ready output from the drive to the PLC. Trouble is the servo wants to pull down 24v from the plc instead of sending 24v to the PLC input, this will be the only input on the plc like this so I hate to add a module for 1 input. I did this years ago so I know it works, but have forgotten what resistor I used. I wired 1 end of a resistor to 24VDC, on the other side of the resistor I went to the input card and also to the servo drive that i need an input from. So my input was ON all the time, except when the servo output turned on, this switched the 24 coming thru the resistor to 0vdc which turned OFF the input on the PLC. So I just inverted my logic in the PLC. The servo output is rated 200ma max, so what size resistor do I need? If I use a 330ohm resistor @ 24vdc that would be roughly 75ma, but 24v X 75ma is 1.8watt. I think I did this with a 1/4 watt resisitor before so if I start with 1/4 watt/24v = 10ma and 24v/10ma =2400ohm resistor, my question here is, is 10ma enough load on an output from a servo. Thanks Travis

yea, I may do the relay, the resistor trick was pretty clean and worked well. don't have time to do much trial and error on this project

I have a ML1500 LRP (1764-28BXB) Processor with Panelview 600 (2711-K6C16) Operator interface. Panel has 2 control relays. CR1 is energized when a 3 pos SS is turned from Off (pos 1) to On (pos 2 maint). CR1 sends Input control power (24vdc and 120vac) to power up the plc and the touchscreen and power to inputs and voltage to the top of CR2. CR2 is energized and latches itself when the operator turns the SS to Enable (pos 3 spring return) If all E-stops are ok. CR2 sends 24 vdc and 120 vac to all outputs. Here is the problem. On start up of the Hydraulic system 60 hp (start button is on touchscreen) the main breaker will occasionally trip. When breaker is reset selector switch is in "On" pos CR1 energizes immediatly. If while the touchscreen is still going thru it's startup diagnosis routine some one turns the SS to "enable" Pos 3 CR2 will energize and the hydraulic system will sometimes start even though the start button was not pressed (screen is still in power up). If i delay turning the SS to enable untill after the screen finishes power-up the hydraulics do not come on ever. It is like the logic is in the last state when the breaker tripped. It does not do this regular enought that I can watch it and see Anyone seen this before? Thanks Travis Rolling_Machine.RSS

Bernie, I understant your logic just fine, Thanks I can see how that would work, unless the panelview is holding the contact closed for the power up time. in which case after the first scan the plc would still start the hydraulics on the second scan. Okie, I am tripping the main CB to the machine, therefore I am losing all power Paul, Look at the way I did the "manual/auto latch" Rung 6,7 & 8 is that what you are talking about in option #1. If I press the auto/man button once it goes into auto mode, if I press the same button a second time it goes into manual mode. At power up the button should not be pressed so by default the plc has the machine in manual mode at power up. By breaker tripping problem is caused by a 60 HP motor on a 100a breaker. The panel that the breaker is in will not accept a larger breaker than this. But my logic problem has me really concerned that some thing can start up at powerup by itself. I have never seen this before, maybe because never had problems with breakers before. Travis

The company I work for purchase a used piece of equipment that has a s5 115u-943 processor in it. I need to make slight modifications to the program for our product so I purchased "S5 for windows" from software toobox. When I go online I can see the processor connected to my computer but can not see any logic or Blocks. do you think this processor is password protected? if so how can obtain the password? We bought the machine from a used equipment dealer not from the company who previously ran the machine (I think they are out of buisness) Thanks Travis

Thanks Guys, I am on vacation this week I will try next week when I return to work. Travis

The PLC battery was dead and PLC in Stop Mode when we recieved the machine. I purchase a new battery, There was an eprom in the cabinet that was not installed in the processor. I inserted the eprom, transferred the program that was on the eprom to CPU. The CPU went into run mode. Then Tried to upload program to my lap top using S5 for Windows. I could not see OB1, but I think there is some program in there because the Processor usage shows 83% No I did not transferr any blocks to my laptop, I can not figure out how. I have No experience with Siemens, but 16 years with AB.

I am configuring a HSCE2 in a 13 slot rack with a 5/04 processor. One of the examples in the book basically fits my application (example 2 pg 6-7). The example does not show ladder 2 jumping to sub 8 Is this only done on a 1st pass or does it jump every scan? Thanks Travis

FINFIN, I have the users manual that I printed off of the Internet on AB's Website Bob O, Basically that is my question Should it jump to lad 8 everscan or just the 1st?