jeffhansen

It's a project that is a conversion from a C1000H program. I don't know what the default should be, just that it wasn't what I needed (and no reason why it should be). It was set to Controller Link. I'm new to Omron, and have no idea what Toolbus or Controller Link mean. I've used Mitsubishi, and I think it has a Communication tab at the top of the page, easy to find. I guess the more options and flexibility a machine has, the more complex and unfriendly it becomes.

GEC became GEC Alsthom Industrial Products Division. Now known simply as IPD, and still have similar product lines.

Thanks. Got it. Network type default wasn't what it needed to be, which was Toolbus. That's not very obvious or intuitive.

I know the answer to this is going to be simple, but I can't find the right button to click. CJ1G-CPU43H I'm trying to transfer the program I've written to the PLC. I'm usin a USB/serial port adaptor which has decided it will be serial port 3, connected to a CS1W-CN226 cable to the Peripheral port of the PLC CPU. CX-Programmer tells me the comms port doesn't exist, and I should change it. I fully agrre, but I'm buggered if I can find where to change the comm port setting. Yours in Frustration, Jeff

Sometimes a motor with a high inertial load, suach as the one in the picture, can drive the motor, especially is it unbalanced, resulting in an overspeed. You might try decreasing the ramp rate (increasing the ramp time) ACC DEC, which I've found to work in the past. If that doesn't work, I'd suggest you add a braking resistor and enable the dynamic braking function. Do you have an encoder for speed feedback fitted?

I said I was new to this! I didn't know I could edit in the IO table. Thanks dweste! So...... I'm going to use the CT021 to give me a rate output, by setting the Time Window Rate Measurement to, say, 200mS. I then extract the rate History Date by using IORD #1F01 #00020003 D500 As far as I can make out, this will put the rate measurement for the two counters into D500 and D501. I'm then going to compare the PV with the SV plus/minus a hysteresis factor, and increment or decrement the output to the speed control if required. If I set up a self resetting timer to control the INC/DEC, I can control the rate at which the output changes, thus preventing oscillation. As I don't need precise control, this should do the job, rather than using PID. Looking at it now, I should have just put a 24VDC digital input card in to do the job, as the process is very slow, the encoder pulse frequency is low, and I could have made a simple rate counter in ladder. Any thoughts on this?

This doesn't really help you Mick, but I've never had much luck with soft starters when coupled to big motors- especially compressors. It's always a fine balancing act to keep the ramp time fast enough to not trip the supply protection, and slow enough to keep within the current capability of the starter. On something with a high inertial load, I'd be oversizing the starter to keep the ramp time down and the current up, thought this may exceed your supply capability from what you are saying. Is the fuse you are using a motor starting rated fuse? In my experience fuses do degrade over time (as do MCCB's) when subjected to high starting currents. There are some very good electronic trip MCCB's on the market that would suit the job. Talk to your local NHP/Schneider/Moeller/ABB rep - any of them would be able to supply a MCCB to do the job. Is 500amp the largest fuses you can fit to the cable as per AS3008? Remembering that when using fuses you must automatically derate to 0.9 so you should be able to use a bigger circuit breaker than you could a fuse. The benefit of using an adjustable circuit breaker is that you can dial up the exact current carrying capacity of the cable, not just pick the next smallest fuse size.

Firstly - I'm relatively new to using Omron, having just completed my first project using a CP1H-XA. For my next job, I'm replacing a C1000H with a CJ1G-CPU43H. Most of the code converted straight over, with only a couple of errors due to Analog I/O, but that is not my issue. I'm upgrading an existing installation, and wish to integrate several speed control functions into the PLC. I have a rotary encoder, which I am using as a speed feedback, not for position, so am only going to use the A output, and feeding it into a CT021 counter module. The output is analog 0-10V, DA041 card. So basically, I need to compare the speed input PV to a SV set via the HMI. I've not used the CT021, and I'm finding the manual rather confusing. What I'm looking for is - is there code required to set up the CT021? - What will be the address of the data register for PV? - Should I use PID, and if so, is there an easy way? I'm happy to be pointed toward the right pages of whichever manual. Thanks for your help. Jeff