Motor control centers
Motor control center services for Northern Colorado plants
The motor control center is where a facility's motors start, stop, and get protected. When it is old, crowded, or mislabeled, every repair takes longer than it should. We install, retrofit, and document MCCs and the motor circuits they feed, with outages planned around your production schedule.
The work
Installation, retrofit, and the circuits in between
MCC work covers everything from setting a new lineup to swapping a single starter bucket. The common thread is that the equipment, the protection, and the paperwork all have to agree with each other when we leave.
Scope
What we do inside and around the lineup
On new work we set the sections, land feeders, and run the motor circuits out to the equipment. On existing lineups we replace or add buckets, convert starter buckets to drive buckets, and rework sections that have been modified one emergency at a time. Each motor circuit gets the overload setting, branch protection, and disconnect it actually needs for the motor on the other end.
When a lineup is old enough that parts are hard to get, we lay out the options plainly: retrofit buckets into the existing structure, replace individual sections, or plan a new lineup and cut circuits over in stages.
- New MCC installation and feeders
- Bucket replacement and additions
- Starter-to-drive bucket conversions
- Retrofit of aging lineups
- Overload and protection settings
- Motor circuits, starters, and disconnects
- Labeling and bucket schedules
- As-built and one-line updates
What goes wrong
Common MCC problems we find
Most MCC failures build slowly and show up at the worst possible moment. A walkthrough with a meter and a thermal camera usually finds them first.
Loose and overheated connections
Lugs, terminals, and bucket stabs that loosen over years of heating and cooling run hot, discolor, and eventually fail. A thermal scan under load finds them before they take a bucket or a section with them.
Wrong overload settings
Overloads set too high stop protecting the motor. Set too low, they trip on a normal start and someone eventually bypasses them. We check settings against the motor nameplate and the load.
Worn contactors and buckets
Contactors on frequently started motors wear out, and buckets that have been forced in and out stop seating properly. Both cause intermittent faults that are easy to misdiagnose from the floor.
Dust, moisture, and pests
MCC rooms in ag and process facilities collect dust and moisture, and rodents find their way in through open conduit and missing covers. Sealing the room and the enclosure is part of the repair.
Labels that do not match reality
In many older facilities, the bucket marked for a pump has fed something else for years. That costs time on every service call and is a real safety problem when someone isolates the wrong circuit.
Process
What to expect when you call
Work inside an MCC usually means taking something out of service, so most of the job is planning.
- Walkthrough. We look at the lineup, the loads, and what you want changed, and trace anything that is not clearly labeled.
- Straight quote. Scope, parts lead times, and how many outage windows the work needs, in plain language.
- Outage planned with you. Single-bucket work can often happen with only that circuit out, depending on the equipment and your site's safety procedures. Bus and main section work needs a planned outage, scheduled around production.
- Install and test. Material is staged before the outage starts, and every circuit is checked for rotation and protection before it goes back in service.
- Documentation. Updated labels, bucket schedules, and as-builts. If your facility has an arc flash study, we will tell you when changes mean it should be updated.
Questions
MCC questions, answered plainly
Should we retrofit our old MCC or replace it?
It depends on the condition of the structure and bus, whether parts are still available, and how much outage time you can give us. Retrofitting buckets into a sound structure is often the cheaper path. If the bus or structure is the problem, replacing sections or the lineup makes more sense. We will give you the options with the trade-offs.
Can you add a bucket to our existing MCC?
Often, if there is space and a compatible bucket is available for that lineup. We check the manufacturer, the bus rating, and the available space before quoting, and tell you up front if a new section is the better route.
Can MCC work be done without shutting down the whole plant?
Some can. Replacing a single bucket can often be done with only that circuit out of service, depending on the equipment and your safety procedures. Work on the bus or main section needs a planned outage, which we schedule with you around production.
What does MCC documentation include?
Labels on every bucket that match the load it actually feeds, a bucket schedule listing each circuit and its protection settings, and updated drawings showing what changed.
Do you wire the motor circuits outside the MCC?
Yes. Conduit and cable runs, local disconnects, and the motor connections are part of the same job, so one crew is responsible from the bucket to the motor.
Related
Related work
MCC work rarely stands alone. Drives, controls, and the facilities they serve are covered on our services and industries pages.
Start a project
Lineup due for work?
Send photos of the MCC nameplate and the buckets you are concerned about, plus a description of what needs to change. We will get back to you the same business day with a straight answer.