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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
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 can find the setting ranges and factory settings of the available parameters in the
Chapter "Operation (Page 75)."
You can find a description of the individual parameters in the Chapter "Parameters
(Page 363)".
You will find the switching states of the output relay below in the Section "Function diagrams"
and in the Chapter "Diagnostics (Page 77)."
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
3RR2 current monitoring relays
4.5 3RR22 current monitoring relays
or active current I
) that flows through the 1/L1 -
s
p
71
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