696LE008146B
Advanced protection functions
5.4 Underfrequency protection (UF-81L)
Inhibition
This parameter allows the protection action to be inhibited temporarily based on a command
sent in one of the following ways:
- sentinel Energy display from the MODE menu
- Hager Power setup software (Commands menu)
- Digital input (DI): assignment of the digital input to the inhibition required
- Modbus communication.
On The protection is inhibited while the inhibition command is at On
O The protection is fully operational while the inhibition command is at O
Activation threshold
Adjustment range: 45.0 to Fn in steps of 0.1.
Precision of the activation threshold: +/-0.1 Hz.
Activation time delay
Adjustment range: 0.1 to 300 s in increments of 0.1.
Precision of the activation time: +/- 40 ms from 0.1 to 2 s +/-2 % above 2 s.
Hysteresis: 102%.
Total minimum break time: 60 ms.
Maximum break time: 140 ms with time delay set to 0.1 s.
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