Baldor mn722 manual Electrical Installation, Load Reactors, System Grounding

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

JOG	LOCAL	PROG
FWD	DISP
REV	SHIFT	ENTER
STOP	RESET

Series H

					Note: Wiring shown for clarity of grounding
					method only. Not representative of
	Note: A line reactor is required and		L1 L2 L3	T1 T2 T3	actual terminal block location.
	must be ordered separately.
					Note: A load reactor is highly recommended
AC Main	L1				and must be ordered separately.
Supply		Line			Optional
	L2
		Reactor			Load
					Reactor
	L3
Safety	Earth
	Four Wire
Ground
Driven Earth	“Wye”	Route all 4 wires L1, L2, L3 and Earth
		(Ground) together in conduit or cable.
Ground Rod
		Route all 4 wires T1, T2, T3 and Motor
(Plant Ground)
		Ground together in conduit or cable.			Ground per NEC and
		Connect all wires (including motor ground)			Local codes.
		inside the motor terminal box.

MN722 Receiving & Installation 3-5