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BETA Monitoring
Monitoring of Electrical Values
7
LQ3 insulation monitors for medical premises
13/36
Siemens ET B1 · 10/2008
13
Connection example: 7LQ3 355 insulation monitors with 7XV9 306 test and signaling combination
Connection of up to four 7XV9 306, 7XV9 304 or 7XV9 302 test
and signaling combinations.
An external 4AC3 616 transformer must be used to supply the
test and signaling combinations with power.
7
LQ3 355
11 14 12 21 24 22 31 34 32 41 44 42 51 54 52 61 64 62
PT
52 51
PE
X1 X2 X5
P1
LT1
LT2
P2
i
k
L
PE PT
A1 A2
PE
PE
N
L2
L
L1
L'
PE '
1)
7
LQ3 355
4
5
2
3
6
7
XV9 306
18
A2 A1
15
AC 24 V
4
AC3 616
4
5
2
3
6
7
XV9 306
4
5
2
3
6
7
XV9 306
4
5
2
3
6
7
XV9 306
1
7
LQ3 358
5
TT3 185
B1
1)
If there is no center tap, L/L‘ is connected to L1 or L2.
230
V AC
>
>
Isolating transformer
3,15 ... 8
kVA
Current transformer
Transformer protection
Overtemperature
Overcurrent
R
<
F
R
an
/
Measuring circuit break
Insulation fault
Insulation monitor
External Test
Reset
external
Jumper =
non-latching
I2_13812a
© Siemens AG 2008