Installation Manual

Electrical Installation

Twin Disc, Incorporated

Manual Override Switch Wiring

The Manual Override switch is used to disable the forward and reverse solenoid drivers when the manual override valve is open. The Manual Override switch is a normally closed contact. In the event the manual override valve is manually activated, the switch contacts will open and the EC300 control will go into a controller neutral condition and no longer power the forward and reverse solenoids. If used, the Manual Override Switch should be installed per Manual

Override Switch Installation.

Install the Manual Override Switch input wiring portion of the Bridge Signals harnesses as follows (See Figure 44):

WARNING

Twin Disc Incorporated strongly recommends that the Manual Override

Switch is properly wired if the transmission is equipped with a manual override valve. Failure to properly wire the Manual Override Switch may cause catastrophic gear failure if the Manual Override Valve and the forward or reverse solenoid are inadvertently activated at the same time.

Refer to General Electrical Installation Guidelines before proceeding with this section.

1.

Connect the customer supplied wire to either screw terminal on one of the manual override valve switches.

2.

3.

4.

Connect the other customer supplied wire to the other screw terminal on the manual override valve switch.

Note: The manual override valve has screw terminals on both sides for two separate connections. One side is for the

J8 Manual Override switch connection and the other side for the J5 neutral start switch connection.

Route the two wires to the EC300 Control.

Note: EC300 Bridge Signals Harness (J8) also may contain wiring for other features. Route the harness to the most convenient location serving all the applicable connections.

Remove the locking wedge from the Deutsch connector.

114 EC300 Marine Control System Installation Manual #1024168

Twin Disc, Incorporated

Electrical Installation

5.

Insert one of the wires into position 3 of the J8 connector.

Note: Refer to the EC300 System Installation Drawings in the

Engineering Drawings Section for pin numbering information.

Note: The J8 connector is part of the Bridge Signals Harness.

Insert the other wire into position 4 of the J8 connector.

6.

7.

When all pins have been inserted in the connector body, reinsert the

Deutsch locking wedge into the front of the connector body.

Ensure that sealing plugs are installed in all empty connector positions.

8.

9.

Align the harness connector with the J8 receptacle of the EC300 Control and push it in until it snaps into place.

10.

Secure all harnesses to a supporting structure with clamps or cable ties at 406 mm (16 in.) intervals.

Note: It may be desirable to complete any other terminations for this harness before securing the harness.

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