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ME50
2
Electrical Connection
2.1 Transducer Connection
Inductive transducers are connected by means of 5−wire circuits.
With transducers in 3-wire technology the sensing leads (gn + gy) not needed.
In this case the contacts 32a+c and 28a+c on the connector must be linked.
For cable lengths >50 m, one resistor with half the bridge resistance value
(BR/2) must be solder into the transducer in place of each feedback bridge. If
the transducers are calibrated in six−wire connection, the resistors must be
solder directly into the sensor circuit.
Measurement diagonale
Bridge supply voltage
Bridge supply voltage
Sensing line to 28a
Sensing line to 32a
Screen
. . . . . . . . . . . . . . . . . .
Fig. 2.1: Bridge connection
The required bridge supply voltage is 2.5 V (symmetrical about ground) as set
factory settings. It can be reduced to 1 V by switch S25.
U
B
2.5 V
(factory settings)
1 V
(for operation with SI01)
The safety barriers SIO1 must be wired into the connecting lines for
transducers in EEx(1) design. In doing so, ensure that the bridge excitation
voltage is 1 V, and switch S29 is set to 0 position (circle not visible). See
chapter 5 for details.
A0765−3.0 en/de/fr
Contact
wh
. . . . .
30c
bk
. . . . . . .
32a
bu
. . . . . . .
28a
gn
. . . . . . . . .
28c
gy
. . . . . . . . .
32c
ye
31a+c
Bridge resistance
R
≥2.5...20 mH
B
R
≥6...19 mH
B
9
Switch S25
HBM
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