Load Data Tab (Electrical Motor Common Properties Dialog) - Intergraph Smart Electrical - Help - Hexagon

Intergraph Smart Electrical Help

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10

Provides information about the mechanical power and usage requirements of the motor. You can find many of these quantities on the motor nameplate. An asterisk beside a property name indicates required data.

Rated power

Allows you to select a standard rated power value that represents the maximum mechanical power that a motor shaft is required to supply. This quantity usually appears on the motor nameplate. You can define and customize the rated power values in the Data Dictionary Manager. The available rated power values can only have hp or kW as the units of measure.

Brake power

Allows you to enter the minimum mechanical power required to make the motor shaft rotate and drive the pump or process equipment attached to the motor. If you enter a value, it cannot be greater than the value of the rated power and must have appropriate units of measure for the standard that you are using: W, kW, MW, or hp. You can specify the default plant units of measure in the Data Dictionary Manager.

Minimum required power

Allows you to enter a value that corresponds to a minimum power requirement of the motor. This quantity is applicable if you are using the IEC (European) standard. If you enter a value, it cannot be greater than the value of the rated power and must have appropriate units of measure: W, kW, MW, or hp. You can specify the default plant units of measure in the Data Dictionary Manager.

Supply

Select the type of supply: alternating current (AC) or direct current (DC).

Number of poles

Select the number of poles for the motor. For example, you can select 2 or 4 poles. You can define and customize the available number of poles in the Data Dictionary Manager.

Rated voltage

Select the voltage at which the motor is designed to operate. This quantity usually appears on the motor nameplate. You can define and customize the available rated voltages in the Data Dictionary Manager.

Particular power

Allows you to enter the power requirement of the motor under a specific operating point that the user specifies. This quantity is applicable if you are using the IEC standard. If you enter a value, it cannot be greater than the value of the rated power and must have appropriate units of measure: W, kW, MW, or hp. You can specify the default plant units of measure in the Data Dictionary Manager.

Number of phases

Select the number of phases in the power supply to the motor. You can select 1 or 3 phases. This property applies for an AC supply only.

Frequency (Hz)

Select the operating frequency of the motor. You can define and customize the available frequencies in the Data Dictionary Manager. This property applies for an AC supply only.

Phase arrangement

Select the required value to determine which of the available phases are in use for the current load, for example 3 PH + N (three phases plus neutral). This property applies for an AC supply only.

Operating factor

Enter a value between 0 and 1 to represent the ratio of the load power requirement to the rated power at an operating point that you specify. The software multiplies the consumed electrical power by the operating factor to calculate average power usage.

Demand factor

Displays a calculated value that represents the ratio of the brake power to the motor rated power. The software calculates the demand factor automatically using the values of the brake power and the motor rated power that you specify on this dialog tab. Alternatively, you can type a demand factor value for the software to calculate the Brake power value. Demand factor values affect the following properties of electrical motors:

  • Brake power

  • Power factor and efficiency at demand

  • Consumed electrical power

LRC power factor

Allows you to enter the value of the ratio of the active power to the apparent power at locked rotor current (LRC). The LRC power factor can have a value between 0 and 1.

Number of wires

Select the number of wires used to supply power to the motor.

Synchronous speed

Displays the maximum theoretical rate of rotation of a machine shaft, in revolutions per minute (rpm), assuming no energy losses due to the magnetic field, pole architecture, and so forth.

Asynchronous speed

Allows you to enter the actual rate of rotation of a motor shaft. If you enter a value, it cannot be greater than the value of the synchronous speed.

Te stall time

Allows you to enter the time that it takes the motor to come to rest after you switch off the power.

Run-up time

Allows you to enter the time that it takes the motor to reach its operating speed after you switch on the power.

Coincidence factors

Allows you to enter values corresponding to the percentage utilization of the motor for the selected operating mode. Also known as duty factors. Type a value between 0 and 1 for the required mode. A value of 0 corresponds to an unused motor, while a value of 1 corresponds to continuous operation.

Operating mode

Select the operating mode that describes how the motor is used in practice in the plant. The standard available operating modes are:

Continuous

Intermittent

Standby

Spare

The coincidence factor corresponding to the selected operating mode provides a quantitative measure of the motor behavior in that mode.

Power factor and efficiency

Enter the values under the conditions of 50%, 75%, and 100% of the rated power. The software uses these values with the rated power and demand factor to calculate the power factor and efficiency at the brake power.

Power factor

Enter the ratio of active power to apparent power under the conditions of 50%, 75%, and 100% of the rated power. The power factor can have a value between 0 and 1.

Efficiency

Enter the ratio of power output to power input under the conditions of 50%, 75%, and 100% of the rated power. The efficiency can have a value between 0 and 1.

At demand

The software calculates the power factor and efficiency at the brake power by linear interpolation of the values you enter at 50%, 75%, and 100% of the rated power.

Manage Operating Cases

Opens the Manage Operating Cases dialog where you can add, edit, or delete property values specific to various plant operating cases that exist for the current plant item.