8
Carotron recommends the use of three phase DIT, drive isolation type transformers. While Elite Pro
controls do not require these transformers for proper operation, they can be helpful in reducing the
effects of line transients on this control and generated by this control on other products and can
provide fault current limiting in the event of severe motor or control failure. Refer to Table 1 as a
general guide in sizing line supply transformers and wiring.
4.2 Motor Connections
Field
Most motor fields consist of two windings that are connected in parallel for 150 VDC operation and in
series for 300 VDC operation. Refer to Figure 2. The winding leads are individually marked and have
a polarity that must be observed for proper and safe operation. Since direction of rotation is
controlled by field polarity as well as armature polarity, it is sometimes more convenient to use the
smaller field leads when making corrections to the direction of rotation during initial installation. An
energized field should
never
be switched by relay, contactor, switch or any other manual or electro
-mechanical device.
Figure 2
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