Page 69
CTAN #215
Ways of Achieving Isolation
Non-Regenerative DC Drives
F3N2C / F3N2E / F3N5C / F3N5E
Focus F3N 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
f the motor. Therefore,
o
NO terminal connection on the control terminal strip (TB2) can
e 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.
The Focus 3 Regenerative drives (F3R2C / F3R2E / F3R5C / F3R5E) are isolated from
the power line and therefore, connections on TB2 can be tied to earth ground.
b
Power
Block
AC
AC
+
-
M
Control
Speed
Pot
A-
VAC
A+
Fault Current
Circuit
Drive Circuit
Common
Circuit Board
Traces
120 / 240
=
Содержание Control Techniques Focus 3N
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