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BETA Monitoring
Monitoring of Electrical Values
7
LQ3 insulation monitors for medical premises
13/34
Siemens ET B1 · 10/2008
13
■
More information
Connection examples
Insulation monitors
Insulation monitors
7
LQ3 354
11 14 12 21 24 22 31 34 32 41 44 42 51 54 52 61 64 62
P1
LT1
LT2
P2
i
k
L
PE PT
A1 A2
PE
PE
N
L2
L
L1
>
>
L'
PE '
1)
7
LQ3 354
7
LQ3 358
1)
If there is no center tap, L/L' is connected to L1 or L2.
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
230
V AC
I2_13582
7
LQ3 355
3,15 … 8
kVA
11
21
31
41
51
61
14
24
34
44
54
64
12
22
32
42
52
62
P1
LT1
LT2
P2
i
k
L
PE PT
A1 A2
PE
PE
N
L2
230
V AC
L
1)
L1
7
LQ3 355
>
>
L'
PE'
7
LQ3 360
X1 X2 X5
X1 X2 X5 PT1 PT2
PE PT
I
Overtemperature
Overcurrent
Transformer
protection
Current transfor.
Reset
External
External test
Insulation monitor
R
<F AL
R
/
Measuring circuit
break
insulation fault
Jumpers =
non-latching
Isolating transformer
1)
If there is no center tap, L/L' is connected to L1 or L2.
Test and
signaling combination
7
LQ3 358
I2_13994
© Siemens AG 2008