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CHAPTER 6: SETPOINTS
Thermal protection
setpoints
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Select Curve
Range: Standard Curve, and FlexCurve B (Note: For FlexCurve A, you can select FlexCurve
B as the setpoint, and vice versa for FlexCurve B.)
Default: Standard Curve
This setting specifies a curve to use as a base for a custom FlexCurve™. Must be used
before Initialization is implemented (see Initialization below).
Multiply
Range: 0.01 to 30.00 in steps of 0.01
Default: 1.00
This setting provides selection for Time Dial Multiplier by which the times from the
inverse curve are modified.
Initialization
Used after specifying a curve to use as a base for a custom FlexCurve™ (see Select
Curve and Multiply above). When the Initialize FlexCurve button is clicked, the pickup
settings will be populated with values specified by the curve selected in this setting.
1.03 × Pickup, ..., 20.00 × Pickup
Range: 0 to 65535 ms in steps of 1
Default: 0 ms
These settings specify the time to operate at the following pickup levels 1.03 to 20.00.
This data is converted into a continuous curve by linear interpolation between data
points. To enter a custom FlexCurve™, enter the operate time for each selected pickup
point.
PATH:
SETPOINTS > S3 PROTECTION > THERMAL PROTECTION
THERMAL O/L FUNC
Range: Disabled, Enabled
Default: Disabled
For details see
Common
START PROTECTION
Range: Off, On, Contact Input 1 to 10, Virtual Input 1 to 32, Remote Input 1 to 32, Logic
Element 1 to 16
Default: Off
By setting the START PROTECTION setpoint to OFF, Start Protection can be disabled.
Thermal protection will therefore go directly to the running condition and the Thermal
Overload Curve will be employed to protect the connected load.
LOCKED ROTOR CURRENT
Range: 2 to 11xFLA in steps of 0.1xFLA
Default: 6xFLA
This is the steady state motor current with the rotor locked, when supplied from a source
at rated voltage and frequency.
SAFE STALL T COLD
Range: 1.0 to 600.0 sec in steps of 0.1 sec
Default: 10.0 sec
This setting is given as the Safe Stall Time Cold.
setpoints.
S3 PROTECTION
6–45
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