Interroll MultiControl Card Failures: The Real Reason Your Conveyor Line Went Down at the Worst Possible Time

The 10:42 Call

In November 2024, a warehouse manager called me at 10:42 p.m. A dead zone on a conveyor line. One of the motorized rollers had stopped communicating. The line had orders backed up, and a contract that would trigger a $50,000 penalty if they missed the morning sort.

He figured they needed a new motor. I asked if the belt had been drifting. He paused. 'Yeah, a little. The last two weeks.' That little drift was the whole story.

If you've ever watched a line go dark right before a deadline, you know the feeling. It's tempting to blame the motor, the PLC, or the maintenance person who 'should have caught it.' But the real problem isn't usually the part that failed. It's the pattern leading up to it.

The Surface Problem: 'It Just Stopped'

When a conveyor zone stops, the first symptom is simple: no movement. The immediate reaction is to rush a replacement part. So you order a motor, pay for expedited shipping, and schedule overtime.

From the outside, a stoppage looks like a sudden random failure. The reality is it's the endpoint of a series of ignored signals. Belt drift is one of those signals. A belt slowly moves sideways until it rubs the frame. That adds load to the drive. The drive draws more current. The control card takes the stress. It doesn't die in a second. It dies over weeks.

In my role coordinating emergency service for a material handling company, I've processed more than 200 rush orders in six years. Honestly, the pattern is almost always the same: someone saw a small thing, and the small thing turned into a big thing.

The Deeper Cause: It's the Card

People assume that if a roller doesn't turn, the motor is bad. In my experience, the motor usually survives. The part that actually fails is the control card. For Interroll systems, that's the Interroll MultiControl card. It is the brain: it handles start/stop, direction, speed, and communication with the PLC. When the brain stops, the muscle doesn't move.

What kills MultiControl cards? Heat, voltage spikes, moisture, and overwork. A misaligned belt makes the drive work harder, which drives more current through the electronics. The card starts running hot. It starts missing faults. Then one day it stops.

I didn't fully understand this until March 2023. A client had already replaced three motors on a line before someone thought to check the MultiControl card. The motors were fine. The card was the problem. That mistake turned a $400 repair into a $2,800 one.

The Cost of Waiting

The cost of a dead conveyor isn't the roller. It's the sequence that follows: the late-night call, the rush freight, the overtime, the missed deadline, the penalty clause, the customer who starts looking elsewhere.

One client paid $800 in expedited shipping to get a MultiControl card through the Interroll USA LLC support channel by 6 a.m. That's frustrating because we could have caught it with a 15-minute check two weeks earlier.

The prevention habit I started using after that: check drift when the line is running. If a belt is close to the edge of the frame, adjust it before it becomes a jam. If a card is warm, find out why. Not every problem is preventable, but most are visible early.

What Actually Works: PUSS

I call it the PUSS method—Prevent Unplanned Stops & Shutdowns. Yes, PUSS. It sounds a little ridiculous. It works.

• P — Pre-shift check. Look at belt tracking on every zone with a motorized roller. If the belt has wear marks on one edge, that's drift. Fix it before it becomes a repair.
• U — Understand the card. MultiControl cards come in different voltage and communication variants. Know the exact part number and fault code meanings before the line goes down. Per Interroll documentation (as of March 2025), LED fault codes vary by card revision—check the latest at interroll.com.
• S — Standardize spares. Keep a spare MultiControl card for each line. One $200 card can save you a $1,400 emergency shipment.
• S — Schedule the check. Quarterly, or monthly during peak season. Five minutes is cheaper than a 2 a.m. call.

You don't need a complex CMMS or a consultant. You need a piece of paper and a rule: before you replace anything, check the things you're not going to replace.

The Fight Analogy You Didn't Ask For

This is where Lewis vs Francis Ngannou comes in. I'm not a martial arts expert, but from the outside that fight looks like two athletes trading punches until one falls. The truth is the fight is won in preparation—the camps, the film study, the sparring. Conveyor reliability works the same way. The line fails in the weeks you didn't check it, not in the minute it stopped.

Check Before You Replace

If you're staring at a dead Interroll roller right now, here's what I'd do:

1. Check belt drift first. If the belt is touching the frame, you've found your starting point.
2. Look at the MultiControl card's LED status. Write down the fault code.
3. Confirm the card's voltage and communication version before ordering.
4. Then call an authorized distributor in your region—including Interroll USA LLC if you're in the U.S.—with the part number from the card label.
5. And order a spare if you don't have one.

The next time a conveyor 'suddenly' stops, ask what it was trying to tell you before. Belt drift. A warm card. Fault codes that appeared and disappeared. The symptoms are usually there—we just don't look when the line is running.

Bottom line: a little prevention beats a big emergency. If you don't have a checklist yet, make one. Or call someone like me—but call before you need to.