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How many passes of power cable can be done through window CT of LTMR/Tesys T and when it should be applied

Published date: 31 July 2019

The controller can physically support up to a maximum of five passes of 2.5 mm² (14 AWG) wire through
the CT windows. There are three looping windows located under the CT windows that physically support
up to a maximum of four wire loops.
Set the parameter Load CT Multiple Passes to account for the number of times the motor wires pass
through the CT window in order to display the correct current readings. For more information, refer to Load
Current Transformer settings

Multiply the current by the number of times that the motor wires pass through the CT windows to determine
the amount of current passing through the internal current sensors.
Adding multiple passes allows to:
 Increase the current sensed by the internal current sensors to a level that the controller can properly
detect, or
 Provide a more accurate reading by the internal current sensors.
We recommend that you select a controller with an FLC value range that includes the motor FLC. However,
if the motor FLC is less than the FLC range of the controller, multiple passes can increase the current level
sensed by the internal current sensors to one that the controller can detect.
For example, if using a controller with an FLC range of 5 to 100 A, and the motor FLC is 3 A, the controller
cannot properly sense the current. In this case, if you pass the power wiring through the internal current
sensors of the controller 2 times, the internal current sensors of the controller sense 6 A (2 passes x 3 A),
a current level that falls within the FLC range of the controller.

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