User Manual

3RR2 current monitoring relays

4.5 3RR22 current monitoring relays

3UG4 / 3RR2 monitoring relays

Manual, 02/2013, NEB927043002000/RS-AA/002

You will find additional information on the connection terminals and the permissible

conductor cross-sections in Chapter "Connection methods (Page 19)."

You will find information on connecting in Chapter "Circuit diagrams (Page 66)."

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

or active current I

) that flows through the 1L1 / 2T1,

3L2 / 4T2 and 5L3 / 6T3 terminals of the device. 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 find the setting ranges and factory settings of the available parameters in Chapter

"Operation (Page 62)."

You will find a descri

ption of the individual parameters in Chapter "

Parameters (Page 351)."

You will find the switching states of the output relay below in the section entitled "Function

diagrams" and in Chapter "Diagnostics (Page 65)."