Samson 3730 Series Mounting And Operating Instructions page 82

Installation
resistance of the supply leads into account,
the voltage at the position transmitter termi-
nals can be between 12 and 30 V DC.
Refer to Fig. 5-31 or to the label on the ter-
minal block.
NOTICE
!
Malfunction due to the current falling below
minimum current.
Î Do not allow the set point to fall below
3.8 mA.
Note
In positioners for attachment according to
VDI/VDE 3847-1, the terminal designation
of the limit switches 41/42 and 51/52 as
well as the OPEN and CLOSED wording can
be changed by turning the terminal label
which is printed on both sides.
Connecting the electrical power
Before performing the electrical connection,
make sure the following conditions are met:
− The positioner is properly mounted onto
the control valve.
− The air supply is properly connected.
If this is the case:
Î Connect the electrical power (mA signal)
as shown in Fig. 5-31.
5-44
5.12.1 Switching amplifier
according to
EN 60947-5-6
For operation of the limit switches, switching
amplifiers must be connected in the output
circuit. To ensure the operating reliability of
the positioner, the amplifiers should comply
with the limit values of the output circuits
conforming to EN 60947-5-6.
Observe the relevant regulations for installa-
tion in hazardous areas.
For applications in safe areas (non-hazard-
ous areas), limit switches can be directly in-
terconnected to the binary input of the PLC in
accordance with IEC 61131. This applies to
the standard operating range for digital in-
puts according to Clause 5.2.1.2 of
IEC 61131-2 with the rated voltage of
24 V DC.
5.12.2 Establishing communica-
tion
Communication between computer and posi-
tioner using an FSK modem or handheld
communicator (if necessary, using an isola-
tion amplifier) is based on the HART
col.
Viator FSK modem
− RS-232 Non ex
− PCMCIA Non ex
− USB Non ex
If the load impedance of the controller or
control station is too low, an isolation ampli-
fier must be connected between controller
proto-
®
Order no. 8812-0130
Order no. 8812-0131
Order no. 8812-0132
EB 8384-3 EN