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Posted by Karl Townsend on June 13, 2008, 6:51 am
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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-E03-Class-72G-soft-start_W0QQitemZ290237861515QQihZ019QQcategoryZ42895QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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
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Posted by Pete C. on June 13, 2008, 7:44 am
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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?
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Posted by Robert Swinney on June 13, 2008, 11:06 am
Please log in for more thread options Sorry but my post re. subject was incorrect: The idler motor HP should be at
least 1-1/2 times that
of the load motor. That implies an idler motor of at least 7.5 HP and combined
HP of 12.5. Again,
suggest check with a local electrician to determine single-phase wiring and
breaker.
Bob Swinney
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?
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Posted by Pete C. on June 13, 2008, 11:10 am
Please log in for more thread options
Robert Swinney wrote:
>
> Sorry but my post re. subject was incorrect: The idler motor HP should be at
least 1-1/2 times that
> of the load motor. That implies an idler motor of at least 7.5 HP and
combined HP of 12.5.
I also noted in a previous thread to try starting the vertical spindle
first to let that add another 5hp worth of idler to the converter before
trying to start the apparently high inertia horizontle spindle.
A proper VFD will entirely eliminate the problems he's having, can
eliminate the noisy RPC and if done properly a single VFD can operate
either of the spindles.
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Posted by Ignoramus29659 on June 13, 2008, 11:16 am
Please log in for more thread options >
> Robert Swinney wrote:
>>
>> Sorry but my post re. subject was incorrect: The idler motor HP should be at
least 1-1/2 times that
>> of the load motor. That implies an idler motor of at least 7.5 HP and
combined HP of 12.5.
>
> I also noted in a previous thread to try starting the vertical spindle
> first to let that add another 5hp worth of idler to the converter before
> trying to start the apparently high inertia horizontle spindle.
>
> A proper VFD will entirely eliminate the problems he's having, can
> eliminate the noisy RPC and if done properly a single VFD can operate
> either of the spindles.
By the way... How is your VFD working for you? Did you add a switch or
you just use the panel buttons?
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> 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.