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Baldor Controls feature UL approved motor overload protection suitable for
motors that consume at least 50% of the output rating of the control. Other
governing agencies such as NEC (National Electric Code) may require separate
over current protection. The installer of this equipment is responsible for
complying with NEC guidelines and CE directives (Conformite Europeene) and
applicable local codes that govern wiring protection, grounding, disconnects and
other current protection.
All logic and control connections are made at the connectors shown in Figure
3-1. All external wires for the control should be run in a conduit that is separate
from power wiring. The use of shielded wire is recommended for all control
wiring.
Protective Devices
Be sure a suitable input power protection device is installed.
Slow Blow Fuse:
Power Disconnect
A power disconnect should be installed between the input power source and the
DBSC for a fail safe method to disconnect power. The control will remain in a
powered-up condition until all input power is removed from the control and the
internal bus voltage has depleted.
Figure 3-1 shows the connector locations.
1.
Connect the incoming AC power wires from the protection devices as
follows:
Line 1 to connector X1 pin 2 (label "L").
Line 2 to connector X1 pin 3 (label "N").
2.
Connect earth ground to X1 pin 1 (labeled "PE") of the control. Be sure to
comply with local codes.
3–2
Overload Protection
Wiring Consideration
Each DBSC must be fused separately. Recommended fuse
rating is determined as follows:
I
= 1.25 X I
fuse
nominal
AC Power Connections
MN1229
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