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Section 1
General Information
Receiving & Installation 3-5MN722
Electrical Installation Interconnection wiring is required between the motor control, AC power source, motor,
host control and any operator interface stations. Use only UL (cUL) listed closed loop
connectors that are of appropriate size for wire gauge being used. Connectors are to be
installed using crimp tool specified by the manufacturer of the connector. Only Class 1
wiring should be used.
Baldor Series 22H controls feature UL approved adjustable motor overload protection
suitable for motors rated at no less than 50% of the output rating of the control. Other
governing agencies such as NEC may require separate over–current protection. The
installer of this equipment is responsible for complying with the National Electric Code
and any applicable local codes which govern such practices as wiring protection,
grounding, disconnects and other current protection.
Load Reactors Line reactors may be used at the control output to the motor. When used this way, they are
called Load Reactors. Load reactors serve several functions that include:
S Protect the control from a short circuit at the motor.
S Limit the rate of rise of motor surge currents.
S Slowing the rate of change of power the control delivers to the motor.
Load reactors should be installed as close to the control as possible. Select the load
reactor that matches the full load amperes (FLA) stated on the nameplate of the motor
you are using.
System Grounding Baldor Controls are designed to be powered from standard three phase lines that are
electrically symmetrical with respect to ground. System grounding is an important step in
the overall installation to prevent problems. The recommended grounding method is
shown in Figures 3-1 and 3-2.
Figure 3-1 Recommended System Grounding – EL
L1
AC Main
Supply
Safety
Ground
Driven Earth
Ground Rod
(Plant Ground)
Four Wire
“Wye”
L1
L2
L3
Earth
LOCAL
SHIFT
DISP
RESET
PROG
ENTER
JOG
STOP
REV
FWD
L2 L3 T1 T2 T3
Series H
Line
Reactor
Optional
Load
Reactor
Route all 4 wires L1, L2, L3 and Earth
(Ground) together in conduit or cable.
Route all 4 wires T1, T2, T3 and Motor
Ground together in conduit or cable.
Connect all wires (including motor ground)
inside the motor terminal box.
Ground per NEC and
Local codes.
Note: Wiring shown for clarity of grounding
method only. Not representative of
actual terminal block location.
Note: A line reactor is required and
must be ordered separately.
Note: A load reactor is highly recommended
and must be ordered separately.