Operation mode
Description
Freq< + df/dt A consecutive operation is enabled between the
protection methods. When the measured
frequency is below the set value of the
Start
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
Start
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
the value set by the
Reset delay Tm df/dt
setting,
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.
Table continues on next page
1YHT530004D05 D Section 4
Protection functions
615 series 497
Technical Manual
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