SIEMENS
10/104
Siemens IC 10 · 2017
Relays
SIRIUS 3UG45, 3UG46 Monitoring Relays for Stand-Alone Installation
Level Monitoring
Level monitoring relays
10
Single-point control
If only one level is being controlled, the terminals for Min and
Max on the monitoring relay are bridged. The output relay
changes its switching state as soon as the liquid level is reached
and returns to its original switching state once the sensor no
longer has contact with the liquid.
In order to prevent premature tripping of the switching function
caused by wave motion or frothing, even though the set level has
not been reached, it is possible to delay this function by
0.5 to 10 s.
For safe resetting, the control supply voltage must be interrupted
for at least the set delay time of +0.5 s.
OVER, single-point control
UNDER, single-point control
1)
The sensor cable does not necessarily have to be shielded, but we do not
recommend installing this cable parallel to the power supply lines. It is also
possible to use a shielded cable, whereby the shield has to be connected
to the M terminal.
> 0,5 s +
t
11/14
A1/A2
t
t
11/12
t
t
Max Min
t
= Delay 0,5 - 10 s
RESET
NSB0_01801b
11/14
A1/A2
t
t
11/12
t
t
Max Min
t
= Delay 0,5 - 10 s
> 0,5 s +
t
RESET
NSB0_01802c
Type
3UG4501
General data
Rated insulation voltage
U
i
Pollution degree 3
Overvoltage category III acc. to VDE 0110
V
300
Rated impulse withstand voltage
U
imp
kV
4
Measuring circuit
Electrode current, max.
(typ. 70 Hz)
mA
1
Electrode voltage, max.
(typ. 70 Hz)
V
15
Sensor feeder cable
m
Max. 100
Conductor capacitance of sensor cable
1)
nF
Max. 10
Control circuit
Load capacity of the output relay
Thermal current
I
th
A
5
Rated operational current
I
e
at
• AC-15/24 ... 400 V
A
3
• DC-13/24 V
A
1
• DC-13/125 V
A
0.2
• DC-13/250 V
A
0.1
Minimum contact load
at 17 V DC
mA
5
© Siemens AG 2016