ABB RED615 Technical Manual page 503

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1YHT530004D05 D

Technical Manual

Operation mode

Freq< + df/dt

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Protection functions

A consecutive operation is enabled between the

protection methods. When the measured

frequency is below the set value of the

value Freq< setting, the frequency gradient

protection is enabled. After the frequency has

dropped below the set value, the frequency

gradient is compared to the set value of the

value df/dt setting. When the frequency gradient

exceeds the set value, the module activates the

START and STR_FRG outputs. The time

characteristic is according to DT. When the

operation timer has reached the value set by the

Operate Tm df/dt setting, the OPERATE and

OPR_FRG outputs are activated. If the frequency

gradient restores before the module operates,

the reset timer is activated. If the timer reaches

Reset delay Tm df/dt setting,

the value set by the

the operate timer resets and the START and

STR_FRG outputs are deactivated. The

OPR_UFRQ output is not active when this

operation mode is used.

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