Samson TROVIS 3730-3, Mounting And Operating Instructions

Page: 87 / 180

EB 8384-3 EN 87
Mounting and start-up
No
ex
Binary input of a PLC acc. to IEC 61131-2
(P
max
= 400 mW) or switching amplifier acc.
to EN 60947-5-6
Ex Switching amplifier according to
EN 60947-5-6
5.16.3 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 ® 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-
fier must be connected between controller
and positioner (interfacing as for positioner
connected in hazardous areas).
If the positioner is used in hazardous areas,
an explosion-protected isolation amplifier
must to be used.
Using the HART
® protocol, all connected
control room and field units can be ad -
dressed individually using a point-to-point
connection or the standard (multidrop) bus.
Point-to-point:
The bus address/polling address must al -
ways be set to zero (0).
Standard bus (multidrop):
In the standard bus (multidrop) mode, the
positioner follows the analog current signal
(set point) in the same way as for point-to-
point communication. This operating mode
is, for example suitable for split-range oper-
ation of positioners (series connection).
G
+81 -82 +11 -12
+83
-84 +51 -52
A2 A3 A1
+41 -42
+31 -32
A
+31 -32
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
Fig. 33: 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 area Hazardous area
Handheld communicator or second
FSK modem (explosion-protected)
Explosion-protected isolation
amplifier
Fig. 34: Connection with FSK modem