Real (Failures/Million Hours)

The base or manufacturer-supplied failure rate entered is used to determine a calculated failure rate. The failure rate is calculated given the expected winding life from the manufacturer. For example, λ b= 1E6 / L, where L is the expected winding life in hours. If no base failure rate is entered, 5.65 is assumed.

Real. Used in Cv calculation.

The actual or operating voltage of the electric motor winding. The units used for actual voltage and rated voltage must be the same. A standard motor operates successfully when the voltage does not exceed +/- 10% of normal. The actual voltage is used to correct the failure rate determination for voltage variations outside the normal limits.

Real. Used in Cv calculation.

The rated voltage of the electric motor winding. The units used for rated voltage and actual voltage must be the same. A standard motor operates successfully when the voltage does not exceed +/- 10% of normal. The rated voltage is used to correct the failure rate determination for voltage variations outside the normal limits.

Integer (ft x 1000). Used in Calt calculation.

The altitude of the motor. This value must be in the range of 0 (Sea Level) to 60 (60,000 ft). The altitude value is used to adjust the failure rate for the effects of altitude on the motor. The failure rate is only affected for non-enclosed motors. For totally enclosed motors, altitudes to 60,000 feet have no impact on motor life. For enclosed motors, leave the altitude at 0.

Real (Degrees C). Used in Ct calculation.

The temperature rise from the ambient subassembly temperature to this component. The temperature rise plus the ambient temperature is equal to the operating temperature of the device.

Real (Degrees C). Used in Ct calculation.

The rated temperature of the electric motor windings in degrees C.

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For more information, see Derating Parameters.