P
Peter Kiproff
I have a problem " In another city " with some electronic controls on a
brake press.
The brake's ram is hydraulic with 3 electric valves & micro switches to
control the positions for
Top of stroke, Pinch point where the ram slows, & Bottom usually a 90 deg
die for sheet metal fabrication.
Most basic controls for this function are 115VAC, This one is 110VDC, When
the valve is turned off there is some kind of high voltage discharge,
adversely affecting other logic.
The only other info I can supply is that it is fused for 5 amps total & 2 of
the valves can be on @ the same time, so I suspect approx 1Amp+ for each
valve. Also I've noticed if a relay is used in place of the micro switch a
spark can be seen!
What would be your best guess for a RC snubber to keep this from affecting
the logic?
I remember reading a .1uf & 47 ohm in series across the coil would work, so
in a pinch I paralleled two 100 ohm 1/4W resisters & used a .1 uf @ 600v
cap. but without being able to measure I don't know if that is enough.
I'd rather over kill somewhat to make sure, the cycle rate would be every
few seconds @ most.
What would be your recommendation?
Thank you
Peter
brake press.
The brake's ram is hydraulic with 3 electric valves & micro switches to
control the positions for
Top of stroke, Pinch point where the ram slows, & Bottom usually a 90 deg
die for sheet metal fabrication.
Most basic controls for this function are 115VAC, This one is 110VDC, When
the valve is turned off there is some kind of high voltage discharge,
adversely affecting other logic.
The only other info I can supply is that it is fused for 5 amps total & 2 of
the valves can be on @ the same time, so I suspect approx 1Amp+ for each
valve. Also I've noticed if a relay is used in place of the micro switch a
spark can be seen!
What would be your best guess for a RC snubber to keep this from affecting
the logic?
I remember reading a .1uf & 47 ohm in series across the coil would work, so
in a pinch I paralleled two 100 ohm 1/4W resisters & used a .1 uf @ 600v
cap. but without being able to measure I don't know if that is enough.
I'd rather over kill somewhat to make sure, the cycle rate would be every
few seconds @ most.
What would be your recommendation?
Thank you
Peter