Milnor BICWUT01 manual Troubleshooting the Inverter, Yaskawa GPD 506 Model Yaskawa F7 Model

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Troubleshooting Basket Speed Errors on Single-motor Washer-extractors

4.If the value is correct at the D-to-A board but wrong at the inverter, check the wiring between the board and the inverter.

5.If the value is correct at both sets of terminals, troubleshoot the inverter.

5.Troubleshooting the Inverter

5.1.Verify Inverter Output Frequency—Use the inverter keypad to display the current desired frequency. This frequency should correspond to the input voltage according to this equation:

Fd = (Vout / 10) * Fmax

Where:

Fd = Desired frequency

Vout = DC voltage output from D-to-A board

Fmax = Maximum inverter frequency (see Table 1)

When the machine is running normally, the inverter display appears similar to one of the illustrations in Figure 3.

Figure 3: Typical Inverter Run Displays

Yaskawa GPD 506 Model

Yaskawa F7 Model

Legend

A.Desired frequency

B.Actual frequency

C.Actual amps

.

The specific procedure for viewing the inverter operating parameters varies among inverter models.

For Yaskawa F7 models, the actual and desired frequencies and the actual amperage are visible on the normal operating display.

For Yaskawa GPD 505 and 506 models, press the DSPL button on the inverter once to advance from the Desired Frequency display to the Actual Frequency display.

5.2.Verify Inverter Output Amperage—Verify the current being delivered to the motor. Contact the Milnor® Customer Service department for guidelines on the acceptable amperage for the conditions.

For Yaskawa GPD 505 and 506 models, press the DSPL button on the inverter once to advance from the Actual Frequency display to the Actual Amperage display.

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

BICWUT01 specifications

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