leeko
Stainless
- Joined
- Jun 30, 2012
- Location
- Chicago, USA
Hi all,
I'm wiring in a TECO FM100 VFD to my new-to-me drill press, and need to ask some advice. After completing any power wiring, i like to check with a multimeter to male sure none of the machine surfaces are hot. When i did this, i got a reading of ~30v between the drill press table and ground. This happens only when the spinddle is running. I got the same reading (30v) between any 2 points on the drill press table or column, which doesn't make much sense to me. Similarly, checking 2 bare points on the VFD electrical box (wall mounted) gives the same reading. I decided it best to stop, disconnect and ask for advice before going any further.
I'm assuming i have a problem with the wiring either between vfd and machine, or in the machine itself. But, I've checked and don't have continuity between any of the hot leads and ground. How else would i have voltage?
The VFD is wired to single phase 220v, then to the three power wires for the motor and a ground to the casting. But, between the motor and those three leads there is a large 5-position drum switch which was originally used for speed changes on the multi-speed motor. I know it's not recommended to have a switch between motor and VFD, but I'm not planning to use it. The wiring to the drum switch is complicated, and i was hoping not to have to get into that if possible as i don't have a wiring diagram. Could that be somehow part of the problem?
The TECO VFD was working fine on another machine.
Thanks in advance for any advice you can offer.
Lee
Sent from my SM-N920T using Tapatalk
I'm wiring in a TECO FM100 VFD to my new-to-me drill press, and need to ask some advice. After completing any power wiring, i like to check with a multimeter to male sure none of the machine surfaces are hot. When i did this, i got a reading of ~30v between the drill press table and ground. This happens only when the spinddle is running. I got the same reading (30v) between any 2 points on the drill press table or column, which doesn't make much sense to me. Similarly, checking 2 bare points on the VFD electrical box (wall mounted) gives the same reading. I decided it best to stop, disconnect and ask for advice before going any further.
I'm assuming i have a problem with the wiring either between vfd and machine, or in the machine itself. But, I've checked and don't have continuity between any of the hot leads and ground. How else would i have voltage?
The VFD is wired to single phase 220v, then to the three power wires for the motor and a ground to the casting. But, between the motor and those three leads there is a large 5-position drum switch which was originally used for speed changes on the multi-speed motor. I know it's not recommended to have a switch between motor and VFD, but I'm not planning to use it. The wiring to the drum switch is complicated, and i was hoping not to have to get into that if possible as i don't have a wiring diagram. Could that be somehow part of the problem?
The TECO VFD was working fine on another machine.
Thanks in advance for any advice you can offer.
Lee
Sent from my SM-N920T using Tapatalk