ABB RED615 Technical Manual page 369

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1YHT530004D05 D

Technical Manual

GUID-010E1FF3-D7B0-42C8-9179-09F753D7DFC3 V1 EN

Operation logic of the fail safe function

The function can also be set into "test/blocked" state with the Operation setting.

This can also be utilized during the commissioning.

The BLOCK input is provided for blocking the function with the logic. When the

function is blocked, the monitored data and measured values are still available but

the binary outputs are blocked. When the function is blocked, the direct inter-trip is

also blocked.

The PROT_ACTIVE output is always active when the protection function is

capable of operating. PROT_ACTIVE can be used as a blocking signal for backup

protection functions.

Once activated, the timer activates the STR_LS_LOC output. Depending on the

value of the set Operating curve type, the timer characteristics are according to DT

or IDMT. When the operation timer has reached the value set with the Operate

delay time in the DT mode or the maximum value defined by the inverse time

curve, the OPR_LS_LOC output is activated. When the operation mode is

according to IDMT, Low operate value is used as reference value (Start value) in

the IDMT equations presented in the Standard inverse-time characteristics section.

A timer reset state is activated when a drop-off situation happens. The reset is done

according to the DT characteristics.

For a detailed description of the timer characteristics, see the

"General function block features" section in this manual.

Instantaneous high stage

In addition to the stabilized low stage, LNPLDF has an instantaneous high stage.

The stabilizing is not done with the instantaneous high stage. The instantaneous

Protection functions

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