GE MM300 Instruction Manual page 151

CHAPTER 5: SETPOINTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Thermal Capacity Alarm Level
Range: 10 to 100% in steps of 1 or OFF
Default: OFF
This setpoint specifies the amount of thermal capacity used, equal to or above that at
which the thermal level alarm is issued.
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 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.
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.
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.
Minimize Reset Time
Range: Enabled, Disabled
Default: Disabled
When set to "Disabled", the lockout condition following a thermal protection operation
will persist until the thermal capacity used has dropped to 15%. When set to "Enabled",
the lockout persists until the thermal capacity used has dropped to 2% below the
learned thermal capacity used at start (refer to the Thermal Start Inhibit for details).
Overload Reset Mode
Range: Manual, Auto
Default: Manual
If this setpoint value is "Auto", an automatic reset of overload lockouts occurs after the
motor has cooled as described above. When set to "Manual", the lockouts are replaced
with trips when the motor cools, the trips must be reset by the control panel, by remote
contact or by communications before the motor can be restarted.
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
feature.
setpoint disables the RTD bias
RTD Bias – Center T
PROTECTION ELEMENTS
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