Parameters
3UG4 / 3RR2 monitoring relays
366
Manual, 05/2016, NEB927043002000/RS-AC/004
(Warning) threshold for undershoot
The device monitors a measured value for undershoot.
The measured value can be parameterized as a threshold or as a warning threshold (on the
3RR22 and 3UG4583 devices only) for undershoot.
The warning threshold defines the switching threshold of the relevant output relay prior to
tripping by measured value undershoot.
If the set threshold is undershot, the output relay changes its switching state after expiry of
the set delay time, and an IO-Link message may be sent. If the measured value has reached
the relevant set hysteresis value, the output relay (reset response is set to autoreset) will
immediately revert to its original state and a new IO-Link message may be sent.
Further response depends on the set reset response (see "Reset response" parameter).
You can find information on the switching behavior of the output relays in the "Functionality"
chapters of the relevant monitoring relays.
Possible indications on the display:
●
Current undershoot: I▼ (threshold), I!▼(warning threshold)
●
Voltage undershoot: U▼ (threshold), possibly U!▼ (warning threshold)
●
Speed undershoot: rpm▼ (threshold), possibly rpm!▼ (warning threshold)
●
Power factor undershoot: φ▼ (threshold), possibly φ!▼ (warning threshold)
●
Active current undershoot: I
r
▼ (threshold), possibly I
r
!▼ (warning threshold)
Possible LED indications:
●
Level undershoot: Yellow LED lights up as soon as the output relay picks up, depending
on the functional principle selected
●
Insulation resistance undershoot: Red LED lights up continuously
●
Voltage undershoot: Red LED lights up continuously