YORK YK — 105% MOTOR CURRENT OVERLOAD

The panel shows 105% MOTOR CURRENT OVERLOAD. The starter documentation prints the displayed shutdown message in full as LCSSS - 105% MOTOR CURRENT OVERLOAD, so the text may appear with the LCSSS prefix. It is displayed when a safety shutdown for motor overload has occurred.

This shutdown is generated by the VSD logic board and indicates that a motor overload has occurred: at least one of the three output phase currents has exceeded 105% of the programmed 100% job full load amps (FLA) value.

The trip logic works as follows. The control center supplies a value of current that corresponds to 100% FLA. The current information from the output CTs is converted to RMS current, and the highest value of the three phase currents is compared with 105% of the 100% FLA value. When the highest current exceeds this threshold, a 40 second timer is started; if the current is maintained at this level for 40 seconds, the safety shutdown occurs and this message is displayed.

• The VSD logic board detected that at least one of the three output phase currents exceeded 105% of the programmed 100% job FLA value.
• The programmed FLA on the control center may be incorrect.
• The output CTs may not be reading current correctly.
• The output current may be unbalanced.
• The pre-rotation vanes or slide valve may not be working properly.

1. Verify that the programmed FLA is correct on the control center — the 100% job FLA setpoint can be viewed by pressing the “Options” key.
2. Verify that the output CTs are reading current correctly.
3. Ensure that the output current is balanced.
4. Verify that the pre-rotation vanes or slide valve are working properly.

• 100% job FLA setpoint — the programmed full load amps value; view it by pressing the “Options” key.
• Overload threshold — 105% of the programmed 100% job FLA value, applied to the highest of the three output phase currents.
• Overload timer — 40 seconds; the shutdown occurs only if the current above the threshold is maintained for this period.

The manual requires a manual reset for this shutdown: This shutdown requires a manual reset via the Reset push-button on the VSD logic board. The Reset push-button is on the VSD logic board itself.