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Testing
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The Regulator Drive outputs (Reg INC and Reg DEC on schematics) drive a 2-wire motor valve.
(Generally referred to as "Servo", "Flow Control Valve" or "Electric Pressure Regulating
Valve").
To increase Flow the controller applies 12volts to Pin-1 and Gnd to Pin-2 of the connector
shown above. To decrease flow the controller applies Gnd to Pin-1 and 12volts to Pin-2. The
polarity is constantly changing while the controller adjusts the valve to maintain the desired
flow rate.
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With a Digital Multimeter set to measure 20vdc, measure the voltage between Pin-1 and Pin-
2 in the following States:
State 1: Controller set to manual, sections and master ON, pressing and holding the Increase
Button. The meter should display 12 or -12volts. Note: It is not important which polarity is
displayed.
State 2: Controller set to manual, sections and master ON, pressing and holding the Decrease
Button. The meter should display opposite to State 1.
Confirming this verifies the regulator outputs on the controller are working correctly.
Note: If the Spray-line pressure increases when the Decrease button is pressed tick the
"Reverse Valve Direction" setting under the TANKS/SETTINGS button in the Sprayer OPTIONS.
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This input is connected to the ZYNX power cable via the relevant extensions and "Y" cable.
When the ZYNX is powered on a low current filtered 12v supply is applied to Pin-A to power
up the ECU's processors.
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With the ZYNX powered ON, confirm 12volts between Pin-A and Pin-B. Note: It is EXTREMELY
important to ensure that the polarity is not reversed as damage will result to the ECU. Make
certain that the Negative (Black) probe is in Pin-B and the Positive (Red) Probe in Pin-A, and
that the Multimeter display does NOT show -12v. (Correct reading is 12volts)
Note: Do not use this output for any other application other than that described in all KEE
literature.
Page 100
V1.98 21/06/06
19.2 SWITCHED POWER
19.1 REGULATOR
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