Milnor Troubleshooting Goodmans GDB1225DTR Remote Washer Speed Errors

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Troubleshooting Basket Speed Errors on Single-motor Washer-extractors

Display or Action

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F01 CCNNWSSS*RPMDRC

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Explanation

The first page of step decisions includes the type and duration of the step, the desired temperature, water valves, fill action, bath level, and steam code.

Press useveral times to advance to the second page of decisions.

The second page of step decisions includes the prompt for the desired basket speed. If the value shown here is not the desired value, change it. The complete procedure for programming a wash formula is described in the reference manual for your machine.

2.Verify Inverter Parameters

The machine processor board adjusts the speed of the motor by communicating with the inverter. The inverter contains several values, called constants or parameters, that control how the inverter interprets signals from the machine processor. These parameters were programmed into original equipment inverters at the Milnor factory before the machine was shipped, but replacement inverters must be programmed with the correct constants for machine type, inverter type, and voltage. If these parameters are incorrect, the inverter will not work as expected.

The procedure for verifying the inverter parameters varies among inverters, but is described in detail in the documentation provided by the inverter manufacturer. Replacement manuals for several inverter models are available at http://www.drives.com.

Inverter constants for specific inverters and Milnor machine models are available in the Customer

Service area of http://www.milnor.com.

3.Verify Digital Value of Programmed Speed

If the desired value is correctly programmed, view the speed diagnostics to verify that the machine controller is commanding the programmed speed. The machine must be running a step in which the speed is wrong.

Supplement 1

Creating a Test Formula

When a wash step begins, the beginning value sent to the inverter is calculated according to this equation:

V0 = [RPMd * (C/RPM)] + D

Where:

V0 = beginning value sent to inverter

RPMd = Desired basket speed in RPMs

C/RPM = Counts per RPM

D = Offset

If all motors, inverters, and digital-to-analog boards could be manufactured to exactly the same specifications, adjustment of the basket speed would not be necessary. However, manufacturing tolerances allow minor variances in these components, so a feedback system is used to monitor the basket speed and make adjustments to achieve the desired value.

If a speed adjustment is required during a wash step, the machine controller signals the inverter

PELLERIN MILNOR CORPORATION

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Contents Published Document Number BICWUT01 Page Pellerin Milnor Corporation Process Chart Troubleshooting Speed ErrorsPress Cancel/Escape to return to Program Menu item Verify Programmed SpeedVerify Inverter Parameters Verify Digital Value of Programmed SpeedCd = RPMd * C/RPM + D Verify Output Voltage of D-to-A Board Model-Specific DataDigital-to-Analog Board Measuring Control Voltage at D-to-A Board and InverterTroubleshooting the Inverter Yaskawa GPD 506 Model Yaskawa F7 ModelTesting the Motor

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