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Receiving & Installation 3–3MN735
Cover Removal To connect power and signal wires, the cover must be removed. This
procedure describes how to access all terminal connections inside the
control.
Using your thumbs, press in and slide the cover down as shown in Figure
3-2.
Figure 3-2 Top Cover Removal
1. Press in to
release cover
2. Slide cover down and remove.
Power Conditioning
System Grounding Baldor Controls are designed to be powered from standard
three phase power lines that are electrically symmetrical with respect to
ground. System grounding is an important step in the overall installation to
prevent problems.
Ungrounded Distribution System
With an ungrounded power distribution system it is possible to have a
continuous current path to ground through the MOV devices. To avoid
equipment damage, an isolation transformer with a grounded secondary is
recommended. This provides three phase AC power that is symmetrical
with respect to ground.
Input Power Conditioning
Baldor controls are designed for direct connection to standard three phase
lines that are electrically symmetrical with respect to ground. Certain
power line conditions must be avoided. An AC line reactor or an isolation
transformer may be required for some power conditions.
S If the feeder or branch circuit that provides power to the control has
permanently connected power factor correction capacitors, an input
AC line reactor or an isolation transformer must be connected
between the power factor correction capacitors and the control.
S If the feeder or branch circuit that provides power to the control has
power factor correction capacitors that are switched on line and off
line, the capacitors must not be switched while the control is
connected to the AC power line. If the capacitors are switched on line
while the control is still connected to the AC power line, additional
protection is required. TVSS (Transient Voltage Surge Suppressor) of
the proper rating must be installed between the AC line reactor or an
isolation transformer and the AC input to the control.