Functions - Siemens 3UG4 User Manual

3UG463. voltage monitoring relay
10.3 3UG4633 voltage monitoring relay
10.3.2

Functions

General functionality
Depending on the setting, the 3UG4633 voltage monitoring relays are self-powered
(measuring voltage = rated control supply voltage) and monitor an AC voltage or DC voltage
at terminals A1 and A2 of the device for overshoot (U▲) or undershoot (U▼) or in range
monitoring (U▲ and U▼).
The voltage monitoring relays are powered with a rated control supply voltage of 17 to 275 V
AC/DC through terminals A1/A2.
The 3UG4633 voltage 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 278)."
You will find a description of the individual parameters in Chapter "Parameters (Page 363)."
Monitoring
Output relay K1 responds in accordance with the set relay switching behavior (closed-circuit
principle NC or open-circuit principle NO).
An output change-over contact is available as a signaling contact.
If the voltage is switched on, the display will show the current measured value and a symbol
for monitoring for voltage overshoot, voltage undershoot, or range monitoring.
Startup delay
To be able to start a drive, the output relay switches to the correct state during the ON-delay
time (onDel) depending on the selected open-circuit principle or closed-circuit principle, even
if the measured value is still under the set value.
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 flash. 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 flash.
You will find the switching states of the output relay below in the section entitled "Function
diagrams" and in Chapter "Diagnostics (Page 279)."
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3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004