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CHAPTER 6: SETPOINTS
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
COOL TIME STOPPED
Range: 1 to 1000 min in steps of 1 min
Default: 30 min
Sets the Cooling Time Constant used by the Thermal Overload Curve when the motor is
not in service. Enter the time in minutes for the motor to cool by 63% of the difference
between the initial and ambient temperature when the motor is stopped.
HOT/COLD RATIO
Range: 0.01 to 1.00 in steps of 0.01
Default: 0.85
This setpoint controls the Hot/Cold Bias and RTD Bias features. If the safe stall time hot/
cold cannot be determined from the motor specification, a typical value of 0.85 is
suggested. If a HCR value of 1 is programmed, Hot/Cold Biasing is defeated.
RTD BIAS FUNC
Range: Disabled, Enabled
Default: Disabled
Sets to disable or enable RTD Bias function.
RTD BIAS MINIMUM
o
Range: 0 to 130
C in steps of 1
o
Default: 40
C
Sets the stator RTD temperature appropriate for a Thermal Capacity Used value of zero.
If RTD Bias is to be deployed, enter the rated ambient temperature.
RTD BIAS CENTER
o
Range: 40 to 155
C in steps of 1
o
Default: 110
C
Sets the stator RTD temperature appropriate for the steady state Thermal Capacity Used
at rated full load motor current. If RTD Bias is to be deployed, enter the rated full load
motor running temperature.
RTD BIAS MAXIMUM
o
Range: 130 to 250
C in steps of 1
o
Default: 130
C
Sets the stator RTD temperature appropriate for a Thermal Capacity Used value of
100%. If RTD Bias is to be deployed, enter the stator insulation temperature rating.
THERMAL ALARM FUNC
Range: Disabled, Enabled
Default: Disabled
Sets to enable or disable the Thermal Capacity Alarm function.
THERMAL ALARM PKP
Range: 10% to 100% in steps of 1%
Default: 75%
Sets the amount of the Thermal Capacity Used where the Thermal Capacity Alarm will be
issued.
AUTORESET TCU≤15%
Range: Auto, Manual
Default: Manual
If this Setpoint is set to AUTO, an automatic reset of an overload lockout occurs after the
Thermal Capacity Used has dropped to 15%. When set to MANUAL, the lockout is
replaced with a trip when the motor cools. This trip must be reset by the control panel, a
remote contact, or a communication command, before the motor can be restarted.
o
C
o
C
o
C
S3 PROTECTION
6–69
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