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320D-329D Visconic Demand Fan Layout Troubleshooting Guidelines ***All testing

320D-329D Visconic Demand Fan Layout Troubleshooting Guidelines ***All testing needs to be completed while the machine is warm. • Ensure configuration settings are correct • Ensure ECM is receiving inputs from engine coolant temperature sensor, hydraulic oil temperature sensor, and ambient air temperature sensor. • Test for wiring continuity between the wiring harness on the visconic fan with the machine ECM (five wires). • Ensure Pin 5 is receiving a constant 5 Volts. • Verify fan speed can be manually overridden through the service menu. • Complete viscous fan testing for coil function and speed sensor. • Unplug fan assembly and ensure fan speed defaults to high speed • Measure actual fan speed with a phototach; compare results with desired fan speed from and actual fan speed as reported by the Machine ECM. • Verify correct belt and pulley number as per SISweb. • Measure actual fan pulley speed with a phototach with respect to engine RPM; compare results with included information. Reference the following pages for more information on the above topics. From the factory the 320D-329D machines installed with the viscous clutch for LACD are only and should ONLY be configured to High Ambient. Configuration Settings Visconic Demand Fan Operation Fan Speed is controlled by the ECM using the following inputs: - Engine coolant temperature - Hydraulic oil temperature - Ambient air temperature All signals can be traced back to the machine ECM. Pin 5 requires a constant 5 volts that is shared between the clutch assembly and the temperature sensor. This is a direct output from the machine ECM. NOTE: This is a general wiring diagram for the viscous fan clutch. Reference the machine specific electrical schematic for appropriate wiring colors and labels. Viscous Fan Wiring Diagram Fan speed can be manually controlled through the override section in the service menu using either the “Fan Motor Speed” or the “Fan Motor Current Percentage.” If the fan speed can be manually controlled correctly, there may be a problem with one of the inputs of the ECM. Override Fan Speed An example of the override parameters is included in the following page. NOTE: The first 150 seconds are controlled by changing the “Fan Motor Current Percentage” parameter. The last 150 seconds are controlled by changing the “Fan Motor Speed” parameter. Data View Showing Override Controls The visconic fan clutch assembly cannot be calibrated. If a calibration is attempted with this unit installed, an error message similar to the one on the left will appear. Although the “Fan Motor Current Percentage” or “Coolant Fan Solenoid Current Percentage” can be adjusted in the override menu, the parameter has no value during normal operation. The value will default to zero and should be ignored. Parameter Notes Viscous Fan Testing The following instructions represent only a partial testing for the viscous fan drive and do not guarantee a correctly working clutch assembly. This is because the ECM controls the clutch via a pulse width generated signal. Therefore, a test bench is needed to ensure all parameters of the clutch assembly work correctly. If any of the following tests fail, the fan drive needs to be replaced. Measure the resistance across the coil low pin (3) and the coil high pin (4). The resistance should measure 30 ohms (+/- 10%). 1 2 3 5 4 Ω R = 30 Ω (+/-10%) Verification of the Coil Function 1 2 3 5 4 Ω R = ∞ Measure the resistance across the coil low pin (3) and all other pins as well as the coil housing. The resistance should be infinite. 1 2 3 5 4 Ω R = ∞ Verification of the Coil Function (cont) Measure the resistance across the coil high pin (4) and all other pins as well as the coil housing. The resistance should be infinite. Verification of the Speed Sensor Measure the resistance across the fan speed output pin (1) and the fan speed ground pin (2). The resistance The resistance should measure 15 kohms (+/- 10%). 1 2 3 5 4 Ω R = 15 kΩ (1+-10%) 1 2 3 5 4 A Ityp = 6 mA … 12 mA U=5 V Measure the current draw between the fan speed supply pin (5) and the fan speed ground pin (2). This will require a DC voltage supply of 5 volts. The current should measure between 6 mAmps and 12 mAmps. uploads/Industriel/ troubleshootig-guide.pdf