Page 61
CTAN #215
Ways of Achieving Isolation
Non-Regenerative DC Drives
Focus non-regenerative motor controllers are not isolated from the power circuit.
Essentially, circuit common on the control card is connected directly to the A+ terminal
of the motor. Therefore, NO terminal connection on the control terminal strip (TB2) can
be connected to earth ground in any way, even momentarily. Any earth ground on
these terminals will effectively short out the power line through the circuit board traces.
Power
Block
AC
AC
+
-
M
Control
Speed
Pot
A-
A+
VAC
Fault Current
Circuit
Drive Circuit
Common
Circuit Board
Traces
120 / 240
=
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