The ON-delay time is started either by switching on the rated control supply voltage or, if the
rated control supply voltage is present, by actuating the relevant contact (e.g. auxiliary contact
of a contactor).
Tripping delay
If the measured value overshoots or undershoots the set threshold after expiry of the ON-delay
time (onDel), the set tripping delay time (Del) and the relay symbol will ash. After expiry of this
time, the output relays change the switching state. On the display, the current measuring value
and the symbol for undershoot or overshoot ash.
Operating mode with/without enable contact
In the operating mode without enable contact (terminal EN = Enable not connected), the output
relay responds when the rated control supply voltage is switched in accordance with the set
closed-circuit principle NC or open-circuit principle NO (relay control is inverted to the closed-
circuit principle NC), and the ON-delay time (onDel) is started, provided the lower threshold is
not at OFF. If the speed reaches the lower threshold value plus the set hysteresis during this time,
the ON-delay time is stopped and normal monitoring begins. If this value has not yet been
reached after expiry of the ON-delay time, the output relay switches to the fault state depending
on the selected relay switching behavior.
For the functioning of the operating mode with enable contact (terminal EN = Enable is
connected to terminal 24V with an isolated NC contact), a rated control supply voltage must be
present at terminals A1 and A2 on the monitoring relay. Only when this NC contact is actuated
will the ON-delay time (onDel) and the drive (with a second contact, for example) be started.
You will nd the switching states of the output relay below in the section entitled "Function
diagrams" and in Chapter "Diagnostics (Page 235)."
3UG4651 speed monitoring relay
12.3 Functions
SIRIUS 3UG4 / 3RR2 monitoring relay
232 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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