PLCs and plant controls
PLC and controls electrician for Northern Colorado facilities
A PLC program is only as good as the wiring underneath it. We build and install control panels, wire PLC hardware and field instruments, and check every point out, working alongside the integrator or in-house controls staff who write the program.
The work
The physical side of plant controls
Controls work splits cleanly in two. Your integrator or controls staff own the logic. We own the panel, the wiring, the field devices, and the checkout that proves every signal goes where the drawings say it does.
Scope
Panels, field wiring, and checkout
We build and wire control panels to the integrator's drawings, install PLC racks and I/O, and run control and instrumentation wiring out to the field: level and pressure transmitters, flow meters, float and limit switches, motor starters, drive control terminals, and alarm devices.
Signal cable gets routed and grounded so analog readings are stable, field junction boxes are sealed against the environment, and every terminal is labeled to match the drawings. Before startup, we check each point from the device to the PLC with the integrator so the program goes in on wiring that is already proven.
- Control panel builds to drawings
- PLC rack and I/O installation
- Instrumentation and transmitter wiring
- Field junction boxes and terminations
- Point-to-point and loop checks
- Adding I/O to existing systems
- Shielding and grounding corrections
- Updated drawings and labels
What goes wrong
Controls problems that turn out to be wiring
Many problems that get blamed on the program are physical. These are the ones we find most often.
Intermittent inputs
A signal that drops out now and then is usually a loose terminal, a cable damaged by heat or equipment, or water in a junction box. They are hard to catch from the program and straightforward to find with a meter once you know where to look.
Noisy analog signals
Readings that jump around often come from signal cable run alongside power cable or drive output, or shields grounded at both ends or not at all. Rerouting and correcting the grounding usually settles them.
Power supply and grounding faults
A failing control power supply or a poor ground can cause faults that look random across the whole panel. We check the basics before chasing individual points.
Moisture and corrosion
Field devices and junction boxes in washdown and wet areas corrode at the terminals. The fix includes the right enclosure and fittings, not just a new device.
Undocumented changes
Years of quick fixes leave panels where the wiring no longer matches the drawings. Every change we make gets documented so the next troubleshooting call starts from accurate prints.
Process
What to expect when you call
Whether it is a new panel or a fault you cannot pin down, the process is the same.
- Tell us the scope. Drawings and an I/O list for new work, or a description of the symptom and when it happens for troubleshooting.
- Coordinate with your integrator. We agree on drawings, terminations, and the checkout plan before we start, so nobody is surprised at startup.
- Build and install. Panels and field wiring are scheduled around production, with cutovers planned for downtime windows.
- Check every point. Each input and output is verified from the field device to the PLC with the integrator or your controls staff.
- Closeout. Marked-up drawings, labeled terminals, and a record of what was checked.
Questions
Controls questions, answered plainly
Who writes the PLC program?
Your automation integrator or in-house controls staff. We work with them so the panel and field wiring match their I/O list and drawings, and we take part in checkout so the program goes in on proven wiring.
Can you build a control panel to our integrator's drawings?
Yes. Send the drawings and bill of materials, and we will quote the build and the field installation together so one crew is responsible from the panel to the field devices.
What is a loop check and why does it matter?
A loop check confirms that each instrument signal travels from the field device to the right PLC input and reads correctly. Doing it before startup separates wiring problems from programming problems, which saves time for everyone.
Our controls have intermittent faults. Can you track them down?
Yes. Intermittent faults are usually loose terminations, damaged cable, moisture, or grounding problems. We trace them with a meter on the physical side and work with whoever supports your program if the logic needs a look.
Can you add I/O or new field devices to an existing system?
Yes. We install the hardware and wiring and update the drawings. Your integrator or controls staff handle the program changes, and we check out the new points with them.
Related
Related work
Controls tie together the drives, motor control centers, and process equipment covered on our services page, in the facilities on our industries page.
Start a project
Panel to build or a fault to find?
Send drawings, an I/O list, or a description of the symptom. We will get back to you the same business day with a straight answer.