Baldor MN781W manual IV. Mounting Instructions, Motor Frequency Multiplier Selection

fault). To set the control to automatically reset after a fault has been cleared, set Jumper J3 to the "AUTO" position. See Figure 12. (Also see section VIB, on page 9 and Table 4, on page 10.)

WARNING! The motor will automatically

!restart when the AC line is applied, if Jumper J4 is set to the "AUTO" or “MAN” position and the Start/Stop Switch is eliminated with a jumper installed between the RUN and COM terminals.

D.Motor Frequency Selection (J5) – Jumper J5 is facto- ry set to the “60Hz” position, for 60 Hz motors. For 50 Hz motors, set Jumper J5 to the “50Hz” position. See Figure 13.

E.Motor Frequency Multiplier Selection (J6) – Jumper J6 is factory set to the “1X” position, for motor frequency corresponding to the frequency setting of Jumper J5 (50 or 60 Hz). To double the output frequency to the motor, set Jumper J6 to the “2X” position (100 or 120 Hz). See Figure 14.

Note: When doubling the motor frequency, the motor will produce full torque up to its base speed. The torque will be linearly reduced to 50% at the maximum doubled frequency.

F.Boost Mode Selection (J7): Jumper J7 is factory set to the "FIX" position, for fixed boost voltage. For adjustable boost voltage, using the BOOST trimpot, set Jumper J7 to the "ADJ" position. See Figure 15. (See section VIIIG, on page 12).

IV. MOUNTING INSTRUCTIONS
	!	WARNING! This motor control is not	designed to
		be used in an explosion-proof application.

It is recommended that the control be mounted vertically on a flat surface with adequate ventilation. Leave enough room below the control to allow for AC line, motor connections and any other wiring. Although the control is designed for outdoor and wash down use, care should be taken to avoid extreme hazardous locations where physical damage can occur. If the control is mounted in a closed, unventilated location, allow enough room for proper heat dissipation. If operating the control at full rating, a minimum enclosure size of 12”W X 24”H X 12”D is required. See Figure 3, on page 4.

V.RECOMMENDED HIGH VOLTAGE DIELECTRIC WITHSTAND TESTING (HI-POT)

FIGURE 12 – RESTART

MODE SELECTION

J4 Set for Manual		J4 Set for Auto
Reset Mode
		Reset Mode
(Factory Setting)
	AUTO		AUTO
J4	MAN	J4	MAN

FIGURE 13 – MOTOR

FREQUENCY SELECTION

	J5 Set for		J5 Set for
60 Hz Motors
			50 Hz Motors
(Factory Setting)
		60 Hz		60 Hz
		FREQ		FREQ
J5		50 Hz	J5	50 Hz

FIGURE 14

MOTOR FREQUENCY

MULTIPLIER SELECTION

J6 Set for 1X		J6 Set for 2x
Motor Frequency
		Motor Frequency
(Factory Setting)
	1X		1X
	MULT		MULT
J6	2X	J6	2X

FIGURE 15

BOOST MODE SELECTION

	J7 Set for			J7 Set for
Fixed Boost
			Adjustable Boost
(Factory Setting)
		FIX			FIX
		BOOST			BOOST
J7		ADJ	J7		ADJ

Testing agencies such as UL, CSA, VDE, etc., usually require that equipment undergo a hi- pot test. In order to prevent catastrophic damage to the speed control, which has been installed in the equipment, it is recommended that the following procedure be followed. Figure 16, on page 9 shows a typical hi-pot test setup.

Note: All equipment AC line inputs must be disconnected from the AC power.

A.Connect all equipment AC power input lines together and connect them to the H.V. lead of the hi-pot tester. Connect the RETURN lead of the hi-pot tester to the frame on which the control and other auxiliary equipment are mounted.

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