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M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
The thermal model is the primary protective function of the relay. It consists of the following five key functions:
•
Thermal model curve (overload)
•
Overload pickup level
•
Unbalance biasing of the motor current while the motor is running
•
Motor cooling time constants
•
Biasing of the thermal model based on hot/cold information and/or measured stator temperature
The algorithm integrates both stator and rotor heating into a single model. The motor heating level is maintained in the
thermal capacity used register. When the motor has been stopped for a long time, it is at ambient temperature and
thermal capacity used is zero. When the motor is in overload, the output operand is set once the thermal capacity used
reaches 100%.
HOT/COLD SAFE
STALL RATIO: 1.00
Range: 0.01 to 1.00 in steps of 0.01
RTD BIAS:
Disabled
Range: Disabled, Enabled
RTD BIAS MINIMUM
40 C
Range: 0 to 250°C in steps of 1
RTD BIAS CENTER
POINT: 130 C
Range: 0 to 250°C in steps of 1
RTD BIAS MAXIMUM:
155 C
Range: 0 to 250°C in steps of 1
START INHIBIT
TCU MARGIN: 0%
Range: 0 to 25% in steps of 1
VOLTAGE DEPENDENT
FUNCTION: Disabled
Range: Disabled, Enabled
VOLTAGE DEPENDENT
MIN MOTOR VOLTS: 80%
Range: 60 to 99% in steps of 1
VD VOLTAGE LOSS:
Off
Range: FlexLogic operand
VD STALL CURRENT @
MIN V: 4.50 x FLA
Range: 1.50 to 20.00 x FLA in steps of 0.01
VD SAFE STALL TIME @
MIN V: 20.0 sec.
Range: 0.1 to 1000.0 s in steps of 0.1
VD ACCELL. INTERSECT
@ MIN V: 4.00 x FLA
Range: 1.50 to 20.00 x FLA in steps of 0.01
VD STALL CURRENT @
100% V: 6.00 x FLA
Range: 1.50 to 20.00 x FLA in steps of 0.01
VD SAFE STALL TIME @
100% V: 10.0 sec.
Range: 0.1 to 1000.0 s in steps of 0.1
VD ACCELL. INTERSECT
@100% V: 5.00 x FLA
Range: 1.50 to 20.00 x FLA in steps of 0.01
THERMAL MODEL
BLOCK: Off
Range: FlexLogic operand
THERMAL MODEL
TARGETS: Self-Reset
Range: Self-reset, Latched, Disabled
THERMAL MODEL
EVENTS: Disabled
Range: Disabled, Enabled
Summary of Contents for M60
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Page 10: ...x M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 552: ...5 344 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
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