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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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wire a soft start
I can't get my 5 horse horizontal spindle to start in the higher speeds...
It trips the 30 amp circuit breaker ahead of my RPC. If anybody remembers, I asked about this issue a week ago, adding capacitors and larger idlers lets it start in lower gears,but I'm not there yet. It uses very little power once up to speed. I looked at a VFD. The way the control panel is wired, it would be hard to install. There is a rotary switch that flips two leads for reversing rotation ahead of a motor contactor. Estop logic can drop this contactor. There's start/stop pushbuttons on the operator panel for motor operation. All logic uses 110 VAC. Iggy suggested a soft start. see this example: http://cgi.ebay.com/Siemens-Series-E...QQcmdZViewItem I'd like to know how these things are wired in before dropping $100. Can a soft start just be installed right in front of the motor? So if power comes on the motor winds up slowly. Will it allow reverse rotation if two leads are switched? Otherwise, I'll look for a VFD. Karl |
#2
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wire a soft start
Karl Townsend wrote: I can't get my 5 horse horizontal spindle to start in the higher speeds... It trips the 30 amp circuit breaker ahead of my RPC. If anybody remembers, I asked about this issue a week ago, adding capacitors and larger idlers lets it start in lower gears,but I'm not there yet. It uses very little power once up to speed. I looked at a VFD. The way the control panel is wired, it would be hard to install. There is a rotary switch that flips two leads for reversing rotation ahead of a motor contactor. Estop logic can drop this contactor. There's start/stop pushbuttons on the operator panel for motor operation. All logic uses 110 VAC. Nothing you mentioned there would make it difficult to connect a VFD. Start and stop pushbuttons simply get disconnected from the existing connections and wired to the VFD. Need more detail on the rotary reversing switch, but it should be able to be wired to the VFD as well. Can you post a link to a schematic so we can give you a rewiring diagram? |
#3
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wire a soft start
On 2008-06-13, Karl Townsend wrote:
I can't get my 5 horse horizontal spindle to start in the higher speeds... It trips the 30 amp circuit breaker ahead of my RPC. If anybody remembers, I asked about this issue a week ago, adding capacitors and larger idlers lets it start in lower gears,but I'm not there yet. It uses very little power once up to speed. I looked at a VFD. The way the control panel is wired, it would be hard to install. There is a rotary switch that flips two leads for reversing rotation ahead of a motor contactor. Estop logic can drop this contactor. That is no problem -- you feed the motor directly from the VFD, and use a selected three of the four terminals which flip the two leads to select forward or reverse command to the VFD (dropping to 5V logic commands instead of the 115 V ones which are currently in use. There's start/stop pushbuttons on the operator panel for motor operation. Most VFDs have the ability to accept the start/stop pushbuttons (working at 5V) without problems. All logic uses 110 VAC. Not necessary (nor desirable) with the VFD. I'm sure that you would feel more comfortable re-wiring the panel at 5V instead of 110 V. Iggy suggested a soft start. see this example: http://cgi.ebay.com/Siemens-Series-E...QQcmdZViewItem That might do well. I'd like to know how these things are wired in before dropping $100. Can a soft start just be installed right in front of the motor? So if power comes on the motor winds up slowly. Will it allow reverse rotation if two leads are switched? Otherwise, I'll look for a VFD. There, I can't help you, since I've never worked with one of these. Perhaps go to the maker's site and download the manual if possible? Good Luck, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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