User`s manual

APPENDIX B – GUI B-16
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
B.2.16.11 Thermal Limiting
The Thermal Limiting panel allows the user to set the motor, bridge and ambient thermal limiting parameters.
For the motor the parameters are:
• End Motor temp. → read only value, calculated from start + span. At this temperature the current is reduced to
0.
• Max. Motor temp. → the temperature at which an over-temperature fault is indicated
• Start Motor temp. → the temperature at which thermal limiting starts to act
• Span Motor temp. → the temperature range over which the current is reduced to 0.
• Motor Thermal Limit Factor → the actual value of the thermal limit factor (a value between 0 and 1.0)
The motor’s temperature is measurable approximately between 25°C and 175°C.
The software calculates the motor thermal limit based upon the motor windings temperature. The motor protection
scheme is intended to ensure that the temperature of the motor core will not exceed 155°C.
For the ambient the parameters are:
• End Ambient temp. → read only value, calculated from start + span. At this temperature the current is reduced
to 0.
• Max. Ambient temp. → the temperature at which an over-temperature fault is indicated
• Start Ambient temp. → the temperature at which thermal limiting starts to act
• Span Ambient temp. → the temperature range over which the current is reduced to 0.
• Ambient Thermal Limit Factor → the actual value of the thermal limit factor (a value between 0 and 1.0)