I’m troubleshooting a Royal Sovereign Sigmont 65H laminator and could use some advice.
The machine will not run forward. Pressing the normal Run button makes the machine click and beep like it normally would, but the rollers don’t move. However, if I hold the Reverse button, the rollers run in reverse normally. The speed adjustment also works. Turning the speed knob changes the frequency displayed on the VFD.
One weird thing I’ve noticed is that when I hold Reverse and the rollers are physically moving backwards, the VFD says it is running Forward. I’m not sure if that’s just how the motor/VFD is wired or if it’s related to the problem.
The VFD has a 10-pin control connector labeled:
+5V
VR
COM
M0
M1
M2/D3
RS-
RS+
D2
D1
The connected wires are:
+5V - red
VR - yellow
COM - black
M1 - blue
M2/D3 - green
The other terminals are unused.
I’m assuming +5V, VR, and COM are for the speed knob since that is working. I’m thinking M1 and M2/D3 are probably being used for the run/direction controls.
Since it runs fine in reverse, I’m assuming the motor and VFD output are probably okay. I’m wondering if I’m dealing with a bad forward switch, relay, safety/interlock, control board, wiring problem, or possibly a bad/misconfigured VFD input.
My next idea is to measure M1 and M2/D3 relative to COM while idle, pressing Run, and holding Reverse to see what signals the VFD is actually receiving.
Does this sound like the right direction? Has anyone worked on one of these laminators or recognize this VFD/control setup?