Baldor BC140, Installation & Operating Manual

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2-2 MN703
Electrical Connections
Connection terminals are shown in Figure 2-2.
Figure 2-2 AC Line, Armature, Field*, and Ground Connections
A- A+ F- F+ L1 L2 GND
-
Barrier
Terminal Block
DC Motor
Ground (Earth)
Ground (Earth)
Armature
Field 115 or 208/230 Volts
AC Line Input
AC Power
Verify AC Line voltage matches to control voltage rating, (115/208/230VAC - 50/60 Hz. 1phase).
Connect AC Line to L1 and L2 terminals and tighten to correct torque (Table 2-1). The installer should
provide fuse protection for each ungrounded supply conductor. See Table 2-2.
The AC Line fuse is factory installed. The Armature fuse (supplied separately) must be installed in the
armature fuse holder, as shown in Figure 2-3.
Fuses are available from your distributor. All fuses should be normal blow ceramic 3AG, MDA, or
equivalent. On domestic 230 Volt AC lines, separate branch circuit protection for each line must be
used.
Table 2-1 Terminal Block Wire and Tightening Torque Specifications
Maximum
Motor Current
(ADC)
90 – 130
VDC Motors
(Max HP)
180 VDC
Motors
(Max HP)
Maximum Wire Size (Cu)
Recommended
Tightening Torque
Maximum
50 Ft.
Maximum
100 Ft.
AWG mm
2
AWG mm
2
lb-in kg-cm
6 1/2 1 16 1.3 14 2.1 12 13.8
12 1 2 14 2.1 12 3.3 12 13.8
The AC Line Fuse acts as a disconnect in case of a catastrophic failure. If the AC Line Fuse blows, the
control is miswired, the motor is shorted or grounded, or the control is defective.
Ground Connection
Connect all ground wires (earth), of connections to the control, to the green ground screw on the
chassis, tighten to correct torque (Table 2-2).
Permanent Magnet (PM) Motor Armature Connection
Connect the motor armature positive lead (+) to Terminal A+ and negative lead (-) to Terminal A-, as
shown in Figure 2-1.
Motor Field Connection (Shunt Wound Motors Only)
CAUTION! Do not connect motor armature leads to Terminals F+ and F-. Do not use Terminals F+ and F- for any
purpose other than to power the field of a shunt wound motor. Shunt wound motors may be damaged
if the field remains energized without armature rotation for an extended period of time.
Full Voltage Field
Connect the field positive (+) lead to Terminal F+ and the negative lead (-) to Terminal F-, on the
Barrier Terminal Block (Table2-2).
Half Voltage Field
For 50 Volt DC with 100 Volt rated armature, use Terminal L1 and F+, on the terminal board (Table2-2).