ABB RELION REX640 Technical Manual page 847

Protection and control

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1MRS759142 F

Figure 479: MNSPTOC Inverse Curve B

If the fault disappears, the negative-sequence current drops below the

value setting and the START output is deactivated. The function does not reset

instantaneously. Resetting depends on the equation or the

The timer is reset in three ways:

• When the negative sequence current drops below start value the subtraction in

the denominator becomes negative and the cumulative sum starts to decrease.

The decrease in the sum indicates the cooling of the machine and the cooling

speed depends on the value of the negative-sequence current. If the sum reaches

zero without a fault being detected, the accumulation stops and the timer is

• If the reset time set through the

being detected, the timer is reset.

• If ST_EMERG_ENA is activated, the timer is reset.

Technical Manual

Cooling time setting elapses without a fault

Protection functions

Cooling time setting.