4.5.2 Function
General functionality
Depending on its setting, the plant is monitored for overshoot (I▲ CO contact, I!
▲ semiconductor output) or undershoot (I▼ CO contact, I!▼ semiconductor output) or for
a range (I▲ , I!▲ and I▼ , I!▼ ≠ OFF).
Depending on their design, the current monitoring relays are powered with a 24 V AC/DC or
24 to 240 V AC/DC supply voltage through terminals B1/B2.
If the power supply is switched on, the CO contact and the semiconductor output responds after
expiry of the set ON-delay time (onDel) on the set circuit principle (closed-circuit principle NC or
open-circuit principle NO).
The 3RR224.‑.F.30 current monitoring relays with digital setting (standard variations) monitor
the AC load current (apparent current I
s
or active current I
p
) that ows through the 1/L1 - 2/T1,
3/L2 - 4/T2 and 5/L3 - 6/T3 device terminals. The monitoring relay has two separate outputs,
which respond to separately settable thresholds.
The devices support further diagnostic options such as residual current monitoring and phase
sequence monitoring, and are also be used to monitor motors even below the rated torque. The
monitoring relays have an additional separate semiconductor output, an actual-value display,
and support digital adjustment.
The 3RR22 current monitoring relays have a display and are parameterized with three keys.
You will nd the adjustment ranges and factory settings of the available parameters in Chapter
"Operation (Page 65)".
You can nd a description of the individual parameters in Chapter "Parameters (Page 281)".
You will nd the switching states of the output relay below in the Section "Function diagrams"
and in the Chapter "Diagnostics (Page 67)."
Reset response
If the device is set to automatic reset, the CO contact and the semiconductor output will respond
once a previously occurring error has been dealt with and the reclosing delay time has elapsed.
A previously occurring error is, therefore, not saved.
If manual RESET is selected, the CO contact remains in the current switching state even if a
previously occurring error has been dealt with.
This saved fault condition can be reset by pressing both arrow keys at the same time for longer
than 2.5 s or by disconnecting and reconnecting the auxiliary voltage.
Note
Semiconductor output
The semiconductor output always responds in automatic reset.
3RR2 current monitoring relays
4.5 3RR22 current monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
62 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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