62 Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019
Chapter 2 Installation
Fiber-Optic Cables
The small, gray (or black) fiber-optic cables are fragile and must be protected
during installation from sharp bends and impact.
Power Factor Correction Capacitors
The controller can be installed on a system with power factor correction
capacitors. The capacitors must be located on the line side of the controller. This
is required to prevent damage to the SCRs in the SMC-50 controller. A separate
switching contactor is recommended to apply the capacitors only after the bypass
contactor has closed, and to remove them when the bypass contactor opens. See
Figure 34
for two different acceptable connection methods.
When discharged, a capacitor has essentially zero impedance. For switching,
sufficient impedance should be connected in series with the capacitor bank to
limit the inrush current. A method of limiting the surge current is to add
inductance in the capacitor circuit. This can be accomplished by putting turns or
coils of wire in the power connections to the capacitors. For more information,
refer to NEMA standard ICS 2, Part 2, Capacitor Applications.
Care should be used in mounting the coils so that they are not stacked directly on
top of each other or they will have a cancelling effect. Also, the coils should be
mounted on insulated supports away from metal parts so they will not act like
induction heaters.
TIP Consult the factory if there are any capacitors on the same branch circuit as the
SMC-50.
ATTENTION: Any covers or barriers removed during installation must be
replaced and securely fastened before energizing equipment. Failure to do so
may result in severe burns, injury or death.
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