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Before everyone starts ripping their E20's from fwd to reverse for
fun.......... The difference between the E20 and the E15 is that the E15 switches field current to reverse, the E20 switches armature current. Field current is small by comparison, and is thus switched by a small DPDT relay. Well, not ALL of the E-15
models are configured that way.<G>
E-15 models HA and later use single coil reversing armature
contactors.
Any operation of the type
described is NEVER in the best interests of longevity. For either control
system. However, the point being made is that the armature reversing
configuration WILL forgive the occasional momentary lapse of reason.
The field reversing types
though, well, they tend to not deal well with that style of operation. :(
RJ Kanary Bandi Bros.
Inc.
Member TRNi Since 1998 ASE® Certified Master Auto Technician |