On 4/2/2013 7:18 PM, Neil Rochford wrote:
so the only question is how many farads of a capacitor would one
require for a 12v / 100w ( ish ) pair of motors ? do they have a "way
round" + and - ?
0.047 uF film or ceramic capacitors (non-polarized) are commonly used to
eliminate noise from motor brushes. But, anything close will also work.
1, Are the "coil leads" the +&- wires ( v+ & gnd ) into the
"relays/solenoid" ?
The "coil leads" are the low-voltage wires that cause the relay to
open/close. As opposed to the "load leads" (NO, NC & COM) that switch
the load. Coils don't care about polarity, but diodes do, so the
circuit is usually marked "+coil" and "-coil" to keep things straight.
2 ,What size/type of diode ( there are many) for what size/type of coil
? does it matter?
A common 1A "signal diode" is sufficient for relay coils.
3 ,How does the reverse direction thing work ? is that zero resistance
side of the diode to the V+ wire on the relays/solenoid and Vice versa ?
will anything be damaged if it was connected the wrong way ?
In normal usage, the "cathode" of the diode (the end marked by the solid
white band) is connected to ground. That allows current to flow from
the voltage source to ground without much resistance, but not the other
direction. When connected across the coil leads, we want to arrange the
diode in a "reverse configuration", where the cathode/band points to the
"voltage source". In that configuration, when the control voltage is
switched on, it will flow from +coil to -coil, but not down the diode.
When the control voltage is switched off, the electric field in the coil
will collapse, causing current to flow back down the leads. With the
diode between the leads, the pulse immediately shorts itself, preventing
the RF noise from being generated.
my leopard ( T051 ) often fired a shot via the actuator when the turret
turned at speed. I think the motor (that spat out sparks) triggered the
actuator. id like to be able to avoid this in the future.
That's one of the most common symptoms of the problem ... servo glitches
when a nearby motor/coil is actuated. Tests in the workshop indicate
that the effect can be seen up to a few feet away from the source of the
problem. [Secret tests conducted on the battlefield indicate that the
effect can be used to temporarily disable an opponent's systems up to 10
feet away when properly "focused".]
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