Delta MM300 Instruction Manual Page 120

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CHAPTER 6: SETPOINTS PROTECTION ELEMENTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 6–33
Figure 26: Thermal protection configuration setpoints
The following setpoints are available for thermal protection.
Standard Overload Curve
Range: 1 to 15 in steps of 1
Default: 4
This setpoint specifies the standard overload curve to the thermal characteristics of the
protected motor.
Unbalance K Factor
Range: 0 to 19 in steps of 1
Default: 0
This setpoint specifies the degree of unbalance biasing used by the thermal model. A
value of “0” disables the unbalance bias feature.
Hot/Cold Safe Stall Ratio
Range: 1 to 100% in steps of 1
Default: 75%
This setpoint is used to control the hot/cold bias and RTD bias features. It specifies the
ratio of the rated hot safe stall time to the rated cold safe stall time as a percentage. A
value of “100%” disables the hot/cold bias feature.
Cool Time Constant Stopped
Range: 1 to 1000 minutes in steps of 1
Default: 30 minutes
This setpoint specifies the cooling time constant used by the thermal model when the
motor is stopped. Enter the time in minutes for the temperature to cool by 63% of the
difference between the initial value and ambient when the motor is stationary.
Cool Time Constant Running
Range: 1 to 1000 minutes in steps of 1
Default: 15 minutes
This setpoint specifies the cooling time constant used by the thermal model when the
motor is running. Enter the time in minutes for the temperature to cool by 63% of the
difference between the initial value and ambient when the motor is at speed.
RTD Bias - Minimum T
Range: 0 to 250°C in steps of 1 or OFF
Default: OFF
This setpoint specifies 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. A
value of “0” or a value greater than the
RTD Bias – Center T setpoint disables the RTD bias
feature.
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