GE M60, Instruction Manual

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5-216 M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
Figure 5-115: Voltage dependent overload logic
THERMAL MODEL BLOCK
— The thermal model can be blocked by any asserted FlexLogic operand. While the blocking signal
is applied, the element remains running and updates the thermal memory, but the states of the
MOTOR START INHIBIT
and
MOTOR THERMAL OP
operands remain unchanged. When the element blocking signal is removed, the element logic is based
on the new value of thermal capacity and updates the status of the
MOTOR START INHIBIT
and
MOTOR THERMAL OP
operands.
In the event of a loss of control power to the relay while the motor status is not offline, the thermal capacity remains
unchanged when control power is restored. If the motor status is offline when control power is lost, the thermal capacity
decays for the duration of the loss of control power based on the stopped motor cooling rate.