Baldor mn792 Figure 4-14 External Field Connections , Figure 4-15 Optional MContactor Connections *

Receiving & Installation 4-11MN792

Electrical Installation Continued

External Field Terminal and Jumper Locations – Size 4 and 5

Relocating the Red and Yellow phase wires (as shown in Figure 4-14) allows terminals FL1 and FL2 to be used

as the external field AC supply connections. External fuse must not exceed 30A.

Figure 4-14 External Field Connections

F13 F14 F3

FL1 FL2 F+ F–

ye llow

red

EX A– EX A+

EX L1

EX L2

Yellow

Red

F14

F13 EX L1

FL1 FL2 F+ F–

EX A–EX A+

EX L2

F2 & F5 = Internal Field Supply.

F3 & F6 = External Field Supply.

Red = FL1

Yellow = FL2

Procedure:

1. Remove the control board (2 screws secure it) to allow access to the power board.

2. Remove the red phase lead from connector “F2” on the left–hand side of the board.

3. Connect the red phase lead to connector “F3” located near the EX L1 terminal.

4. Remove the yellow phase lead to connector “F5” on the left–hand side of the board.

5. Connect the yellow phase lead to connector “F6” located near the EX L2 terminal.

6. Connect L1 to FL1, and L2 to FL2. When using an external AC input it is important to have the

correct phase relationship on the terminals. The supply must be derived from L1 (Red) and L2

(Yellow) phases directly or indirectly through a single phase transformer. L1 must be connected to

FL1, and L2 connected to FL2.

M-Contactor If required by local codes or for safety reasons, an M-Contactor (motor circuit contactor) may be installed.

However, incorrect installation or failure of the M-contactor or wiring may damage the control. If an M-Contactor

is installed, the control must be disabled for at least 20msec before the M-Contactor is opened or the control

may be damaged. M-Contactor connections are shown in Figure 4-15.

Figure 4-15 Optional M–Contactor Connections

* Optional

RC Device

Electrocube

RG1781-3

M Enable C

* M-Contactor

To Customer Provided

Power Source

(Rated Coil Voltage)

M=Contacts of optional M-Contactor Note: Close “Enable”

after “M” contact closure.

A+ A–F+ F–

F+ F–

* M

See Recommended Tightening Torques in Section 9.

Control faults may occur if the control is enabled before the M Contactor is closed. The timing diagram shown in

Figure 4-16 defines the correct operating sequence.

At Turn ON

Allow 20 milli seconds for the coil of the M contactor to energize and close the contactor before the Enable input

at C–4 is issued.

At Turn OFF

Do not allow the M Contactor to open until motor shaft rotation has stopped and the Enable at C–4 has been

removed. If this sequence does not occur, a TACH LOSS fault may be issued by the control.

Note: This example shows a “Drive ON” output to a PLC that is used to command the DC control and the

holding brake.