Strapping/Banding Machine Won't Power On
A machine that won't power on usually points to one of a small number of causes - the supply, an engaged stop, a blown fuse, or the control board. Most are quick to rule out before an engineer is needed.
Common symptoms
If one of these matches what you're seeing, you're in the right place. More than one symptom at once usually narrows it down faster.
Nothing happens when the power switch is turned on
No lights, no sound, no panel response at all. Usually a supply issue upstream of the machine rather than a machine fault.
Panel lights up but the machine won't start
Power is reaching the control board but the machine isn't responding to start commands. Check for active faults or an engaged e-stop before assuming a board fault.
Machine trips the breaker immediately on switch-on
A hard trip on power-up usually means a short in the motor or wiring. The circuit is protecting itself - don't keep resetting it.
Machine was running, then stopped mid-shift and won't restart
Mid-shift failures often point to a thermal cut-out or a fuse blown under load. Less likely to be a wiring fault unless the machine has had recent work done.
Power light is on but nothing functions
The machine has power but is sitting in a fault or lockout state. Check for alarm codes on the display before touching anything else.
Fuse keeps blowing after replacement
A fuse that blows again immediately after replacement is a symptom, not the fault. Something downstream is drawing excess current. Find that before replacing it again.
Typical causes
Power supply fault
The socket, supply cable or isolator is faulty and power isn't reaching the machine. Often the last thing people check because the fault seems too simple - but it's the most common cause.
Emergency stop engaged or stuck
The e-stop circuit is open. The machine won't run by design. Check every e-stop on the machine and any connected to the production line - a latched button anywhere in the circuit will prevent start.
Blown fuse or tripped breaker
A fuse has blown or a circuit breaker has tripped. Often the secondary effect of another fault rather than a cause in itself. Replace it once - if it blows again, stop and find the root cause.
Control board or electrical fault
The control electronics have failed. Less common than the causes above, but more likely on machines with high cycle counts, moisture exposure, or a history of electrical issues.
What to check first
Work through these in order. If you get a clear answer at any step, that's your starting point. If none of them land, the fault needs hands-on diagnosis.
Check every e-stop on the machine
Walk the machine and release every emergency stop button - even ones that look like they haven't been touched. One latched button anywhere in the circuit keeps the machine off. This takes 30 seconds and clears the most common cause.
Check the supply back to the socket
Is the socket live? Has the isolator been turned off? Is the supply cable visibly damaged? Work from the machine back to the supply point before opening any panels.
Check the machine fuse
If the machine has an accessible fuse, check it. Replace it if it's blown - but power up with nothing else changed and watch what happens. A fuse that blows again immediately means something is drawing too much current.
Check the display for alarm codes
If the panel shows anything at all - even a partial display - look for a fault or alarm code. Take a photo of it. The code is the machine telling you which subsystem triggered the fault and is the first thing we'll ask for when you call.
If any of these apply, don't wait
- The breaker trips immediately every time the machine is powered up
- A fuse has been replaced more than once and keeps blowing
- The machine has had moisture exposure or visible damage to wiring or connectors
- The control panel is completely dead with confirmed supply at the socket
Intermittent electrical faults get harder to diagnose the longer they're left. If the checks above haven't given you a clear cause, call before the next shift starts.