Allen Bradley 1391-T050DT

The Allen-Bradley 1391-T050DT isolation transformer is a 5 kVA rated isolation transformer. It is designed for use with Allen-Bradley 1391B-ES servo controllers. In order to maintain the UL listing on Allen-Bradley 1391B-ES controllers, the users must provide power to the 1391B-ES controllers from an Allen-Bradley 1391 isolation transformer. The use of other transformers voids the UL listing. The Allen-Bradley 1391B-ES controllers are available in 15, 22.5, and 45 Amps current ratings. The complete servo system comprises a 1391B-ES controller, a 1391 transformer, a 1326 servo motor, and 1326 cables.

The 1391-T050DT isolation transformer is rated for 5.0 kVA. The primary voltage for the transformer is 240 to 480 Volts AC. The input is 3-phase and the supported line frequency is 60 Hertz. The secondary voltage for the transformer is 3-phase 230 Volts AC voltage. The secondary voltage also includes four 36 Volts AC single-phase rated windings. The 36 Volts AC output on the transformer is used to provide power to the logic control board on the 1391B-ES controller. The 36 Volts AC leads are connected to terminals 19 and 21 on Terminal Block 4 of the controller. The center tap is connected to terminal 20 of Terminal Block 4. The power dissipation for the 1391-T050DT isolation transformer at 20, 40, 60, 80, and 100% rated output is 50, 100, 150, 200, and 250 Watts, respectively. The weight of the 1391-T050DT isolation transformer is 100 pounds and it measures 11 x 14 x 11 inches. The ambient air temperature around the 1391-T050DT isolation transformer must be kept between 0 and 60 degrees Celsius and the relative humidity should be between 5 and 95% (non-condensing).