mjr6550
Aluminum
- Joined
- Oct 7, 2012
- Location
- Lansdale, PA
This starter is an old one-about 1958. It is on a Gorton P2-3 pantograph milling machine that I recently acquired. It is controlled by momentary start/stop switches. The machine is 240-volt 3-phase with a 1/2 hp motor. I am operating on a static phase converter and have only used it a few times.
The control circuit is 120 volts supplied by a 0.15 kVA transformer in the electrical enclosure with the magnetic starter. The control circuit has a 10 amp cartridge fuse.
Now to the possible problem. I started the machine over the weekend and the contactor immediately tripped out. I tried the reset button by no help. I took apart the reset button and removed the heaters to look for problems. They seemed fine, as does the contacts and wiring. I realized then that the fuse must have blown. No continuity through the fuse. I don't have a spare, so I ordered a few. My only thought is that I release the tension on the belts when the machine sits unused and I tightened them (maybe too much) before I tried to use it. Could that have caused the current draw to be too high? And, since this is a control circuit fuse, would that be affected by a high current draw?
The control circuit is 120 volts supplied by a 0.15 kVA transformer in the electrical enclosure with the magnetic starter. The control circuit has a 10 amp cartridge fuse.
Now to the possible problem. I started the machine over the weekend and the contactor immediately tripped out. I tried the reset button by no help. I took apart the reset button and removed the heaters to look for problems. They seemed fine, as does the contacts and wiring. I realized then that the fuse must have blown. No continuity through the fuse. I don't have a spare, so I ordered a few. My only thought is that I release the tension on the belts when the machine sits unused and I tightened them (maybe too much) before I tried to use it. Could that have caused the current draw to be too high? And, since this is a control circuit fuse, would that be affected by a high current draw?