Samson 3730 Series - Page 82

5-44 EB 8384-3 EN
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.
Malfunction due to the current falling below
minimum current.
Î Do not allow the set point to fall below
3.8mA.
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.
5.12.1 Switching amplier
according to
EN 60947-5-6
For operation of the limit switches, switching
ampliersmustbeconnectedintheoutput
circuit. To ensure the operating reliability of
thepositioner,theampliers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amplier)isbasedontheHART
®
proto-
col.
Viator FSK modem
− RS-232 Non ex Orderno.8812-0130
− PCMCIA Non ex Orderno.8812-0131
− USB Non ex Orderno.8812-0132
If the load impedance of the controller or
control station is too low, an isolation ampli-
ermustbeconnectedbetweencontroller
NOTICE
!
Note
G
+81 -82 +11 -12
+83
-84 +51
-52
A2A3 A1
+41 -42
+31 -32
A
+31 -32
+31 -32
+31 -32
G G
Optional Optional Optional
24VDC
Solenoid
valve
(optional)
mA
control
signal
A3
Fault
alarm
A2
Software
A1
Software
optionally
inductive
Limit switches
Analog
input x
Leakage
sensor
Position
transmitter
with two-
wire
transmitter
supply unit
Binary
input
Non ex
Binary input
1)
of a PLC or
switchingamplier
2)
Ex
Switchingamplier
2)
Optional Optional
1)
Binaryinputacc.toIEC61131-2(Pmax=400mW)
2)
SwitchingamplieraccordingtoEN60947-5-6
Fig.5-31: Electrical connections
3730-30
3730-31
Connection in safe area
Connection in hazardous area
Controller/
control station
Controller/controlstation
Handheld communicator or
second FSK modem
4to20mA
Safe range Hazardous area
Handheld communicator or second
FSK modem (explosion-protected)
Explosion-protected
isolationamplier
Fig.5-32: Connection with FSK modem