Brake Power / Demand Factor Calculation - Intergraph Smart Electrical - Help - Hexagon

Intergraph Smart Electrical Help

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Intergraph Smart Electrical
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Smart Electrical Version
10

The software enables you to calculate the required brake power or demand factor values for an electrical motor in your plant. The standard (default mode) for load data calculation is to enter an appropriate rated power value and let the software calculate the demand factor. Alternatively, you can also enter an appropriate demand factor value and select a motor rated power value. In this case, Smart Electrical will calculate the brake power.

If you want to be able to enter a demand factor value so that the software can calculate the brake power, prior to making your calculations, you must set the Demand factor property in the Data Dictionary Manager to Write. For details about setting permissions for Smart Electrical properties, see Modify Item Type Properties in the Data Dictionary Manager help.

Therefore, the software does the following depending on your input on the Load Data tab of the Electrical Motor Common Properties dialog:

  1. No values have been entered for the motor rated power, brake power, or demand factor.

    • Enter the motor rated power and brake power values to calculate the demand factor.

    • Enter the motor rated power and demand factor values to calculate the brake power.

  2. The three values (the motor rated power, brake power, and demand factor) have already been entered or calculated.

    • Changing the motor rated power recalculates the demand factor.

    • Changing the brake power recalculates the demand factor.

    • Changing the demand factor calculates the brake power.

To calculate the demand factor or brake power, do the following:

  1. In the Electrical Index, expand the folder hierarchy Electrical Equipment > Loads > Motors.

  2. Expand the Motors folder and select an existing motor from the list.

    OR

    Right-click the Motors folder, then create a new motor.

  3. Right-click the motor and select Common Properties to open the Electrical Motor Common Properties dialog.

  4. Select the Load Data tab.

  5. Enter an appropriate motor rated power value.

    In order for the software to make the required calculation, you must select an appropriate motor rated power value either before or after you enter the demand factor or brake power value. The software will make the required calculation once the motor rated power and the second value have been entered.

  6. To calculate the Demand factor, type an appropriate Brake power value.

    OR

    To calculate the Brake power, type an appropriate Demand factor value.

  7. Select in another property or press the Tab key.

The Demand factor value affects the following properties of electrical motors:

  • Brake power.

  • Power factor and efficiency at demand.