Topcom X20 manual Dump, KEE Sensors

Testing V1.98 21/06/06

19.3 DUMP .

Figure 69: Dump Valve connector

Overview

The dump valve drive outputs (Dump OPEN and Dump CLOSE on schematics) drive a 2-wire motor valve. (generally referred to as "Dump", "Main Valve" or "Master Valve"). To open the dump valve the controller applies 12volts to Pin-1 and Gnd to Pin-2 of the connector shown above. To close the dump valve the controller applies Gnd to Pin-1 and 12volts to Pin-2. The Dump is open (bypass to tank) when all sections or master switch is OFF and Closed (pressure to Spray-line) when the master and any sections are ON.

Dump Drive Test

With a Digital Multimeter set to measure 20vdc, measure the voltage between Pin-1 and Pin-

2 in the following States:

State 1: Master Switch or all sections OFF. The meter should display 12 or -12volts. Note: It is not important which polarity is displayed.

State 2: Master Switch ON and any sections ON. The meter should display opposite to State 1. Confirming this verifies the dump outputs on the controller are working correctly.

Note: If the Dump valve opens when it should close swap the wires connected to Pin-1 and Pin-2 in the connector (Shown Above).

19.4KEE SENSORS

Figure 70: Sensor connector

Overview

All KEE shaft sensor inputs (other references "flow sensor", "speed sensor", "encoder" and "feedback") are pinned alike.

Each time the Sensor is exposed to magnetic field (Hall Affect) or metallic object (Proximity) the circuit is closed between Pin-A and Pin-B. The controller sees this as 0volts. Then 5volts when the sensor is clear of the magnet or metallic object.

Sensor Input Test

Ensure ECU is powered ON.

1.On the Harness with the sensor disconnected:

•11-12volts between Pin-B and Pin-C

•5volts between Pin-A and Pin-B

2.Sensor Connected but not exposed to the magnet:

•11-12volts between Pin-B and Pin-C

•5volts between Pin-A and Pin-B

3.Sensor connected with exposure to the magnet:

•11-12volts between Pin-B and Pin-C

•0volts between Pin-A and Pin-B

Note: Sensor power is 1amp current limited and should NEVER be used for any other purpose.

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