On the display
The display reads Motor - High winding temperature. The manuals also print this message as MOTOR - HIGH WINDING TEMPERATURE. It is listed with the safety fault messages for this chiller: it is a safety shutdown, not an advisory.
What it means
This message is a safety shutdown of the chiller on motor winding temperature. The shutdown is set at the Motor High Winding Temp Fault Threshold value, an Admin programmable setpoint with a default of 270.0°F (132.2°C). The shutdown does not occur when the winding temperature protection setpoint is set to Disabled on the motor details screen, and it does not act on any RTD input registering as an open RTD or on any individual winding temperature sensor that has been disabled.
Why it appears
- Any of the enabled motor winding temperatures exceeded the programmed high winding temperature shutdown threshold plus the programmed winding hotspot allowance threshold for 3 s continuously.
- The average winding temperature exceeded the programmed high winding temperature shutdown threshold for 3 s continuously.
Setpoints and thresholds
- Motor High Winding Temp Fault Threshold — Admin programmable setpoint, default 270.0°F (132.2°C). The safety shutdown is set at this value; the manual notes that only in extreme cases will it ever be changed, under the guidance of Johnson Controls PTS and engineering.
- High winding temperature shutdown threshold — the programmed threshold both trip conditions are measured against: individual windings trip at this value plus the winding hotspot allowance threshold, the average winding temperature at this value itself.
- Winding temperature protection setpoint — on the motor details screen; while it is set to Disabled, this safety shutdown does not occur.
Reset and restart
Recovery is a cool-down followed by a manual clear. The manual states: The chiller can be started after all winding temperatures decrease to at least 18°F (10°C) below the shutdown threshold and the Clear button is pressed next to the listed event on the Systems Details Screen.
No start is possible before the windings have cooled to that margin below the shutdown threshold.
Questions engineers ask
What does Motor - High winding temperature mean on a YORK YK chiller?
It is a safety shutdown: either an enabled motor winding temperature exceeded the high winding temperature shutdown threshold plus the winding hotspot allowance threshold, or the average winding temperature exceeded the shutdown threshold — in each case for 3 s continuously.
How do I clear a Motor - High winding temperature shutdown on a YORK YK?
Let all winding temperatures fall to at least 18°F (10°C) below the shutdown threshold, then press the Clear button next to the listed event on the Systems Details Screen. The chiller can then be started.
What is the winding temperature trip setpoint on a YORK YK?
The Motor High Winding Temp Fault Threshold, an Admin programmable setpoint with a default of 270.0°F (132.2°C). The manual says it is changed only in extreme cases, under the guidance of Johnson Controls PTS and engineering.
Does an open RTD cause Motor - High winding temperature on a YORK YK?
No. The shutdown does not act on any RTD input registering as an open RTD, nor on any individual winding temperature sensor that has been disabled.
Messages next to this one
The same message on other models
Source
Written from the manufacturer's manuals for the YORK YK; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YK messages: fault codes · YORK YK documentation · YORK manuals