20888623 Volvo.Penta Vibration damper

The control can be damaged with the wrong voltage. When replacing a control, check the power supply, battery, etc., for the correct voltage.
Troubleshooting Procedure
This chapter is a general guide for isolating system problems. Before using this procedure, make sure that the system wiring, soldering connections, switch and relay contacts, and input and output connections are correct and in good working order. Make the checks in the order indicated. Each system check assumes that the prior checks have been properly done.Control Test and Calibration
General
Do the following checks on the 721 control. Then verify the functioning of set points and adjustments.1. Connect the Hand Held Programmer to the control in accordance with the instructions in Chapter 4. Verify that correct voltage and polarity are applied to the control. Verify that the programmer does its power-up tests. Failure to do the power up test indicates either the control or Hand Held Programmer has failed. If so, try this step with another Hand Held Programmer. If the test still fails, replace the 721 control. If the test passes with the second Hand Held Programmer, replace the Hand Held Programmer.2. Press the "ID" key. The message "721 Speed Control P/N 5412-505/506" should appear. Failure indicates either the control or Hand Held Programmer has failed. If so, try this step with another Hand Held Programmer. If the test still fails, replace the 721 control. If the test passes with the second Hand Held Programmer, replace the Hand Held Programmer.3. Select Menu 0. Step through the menu to the Diagnostics Result step. Verify that the displayed value is 49. If any other value is displayed, replace the control.4. Select Menu 1. Verify that all set points are as recorded during installation. Repeat for the other menus. If any differences are found, change the set point(s) to the correct value. Press the "SAVE" key. The message "Set Points Saved" should be displayed. Remove power from the control for at least 10 seconds. Verify correct values were retained during power down. Failure indicates the control has failed and should be replaced.Discrete Inputs
Do the following test to verify the function of the discrete inputs. Do NOT do these tests with the engine running.1. Close the Minimum Fuel (Run/Stop) contact. Select Run/Stop Contact Status on Menu 0. The status should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.2. Close the Idle/Rated contact. The Idle/Rated Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.3. Close the Lower Speed/Load contact. The Lower Speed Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.4. Close the Raise Speed/Load contact. The Raise Speed Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.5. Close the Failsafe Override contact. The Failsafe Override Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.6. Close the Unload/Reset to Rated contact. The Unload Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.7. Close the Base Load contact. The Base Load Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.8. Close the Circuit Breaker Aux contact. The Circuit Breaker Contact Status in Menu 0 should be closed. If the value does not change from closed to open when the contact is opened, verify the voltage at the control terminals. If correct voltage is verified, the control has failed and should be replaced.Any discrete input with power applied should indicate a closed status. If proper voltage is determined at the terminal strip, failure indicates the control input is bad. Replace the control.KW Transducer Input
The following tests calibrate and verify the function of the KW Transducer input (Signal Input #1).1. Connect a 4 to 20 mA source to terminals 36(+) and 37(-). Make sure a jumper is installed across terminals 35 and 36. Connect a mA meter in series with the 4 to 20 mA source.2. Set the source for 20.0 mA on the meter. Select Menu 9 on the Hand Held Programmer.3. Set the Calibration Key to 49. Select KW Load Input.4. Verify that the display reads 20.00 0.01 mA.5. Set the source for 4.0 mA. The KW Transducer input value should be 4.0 mA 0.2 mA. If the meter indicates proper currents are present on Signal Input #1, but readings on the Hand Held Programmer are incorrect, the 721 control is defective and should be replaced.SPM Synchronizer Input
The following tests calibrate and verify the function of the SPM Synchronizer input (Signal Input #2).1. Connect a 1 to 5 Vdc source to terminals 39(+) and 40(-). Connect a dc voltmeter across terminals 39(+) and 40(-).2. Set the source for 5.0 Vdc on the meter. Select Menu 9 on the Hand Held Programmer.3. Set the Calibration Key to