Samson 373 Series User Manual

86 EB 8384-2 EN
Mounting and start-up
accordingtoEN60079-15,circuitsmaybe
connected, interrupted or switched while en-
ergized only during installation, mainte-
nance or repair.
The special conditions of use mentioned in
the statement of conformity are to be ob-
served for the rated values and the installa-
tion of the series-connected fuse for intercon-
nectionofExnAcircuits.
ForExnAequipment(non-sparkingequip-
ment), circuits may be connected, interrupted
or switched while energized only during in-
stallation, maintenance or repair.
− PositionerswithtypeofprotectionExnA
orExtccanbeusedwithaclosedcover
(no window) or or with a cover with win-
dow.
− TheTypes3730-21,3730-25and
3730-28Positionersare100%identical
in design, except for the marking and the
housing cover.
− FortypeofprotectionExnA,theVCC
connection in the interface adapter must
be connected in series with a fuse ac-
cordingtoIEC60127,250VForTwith
a fuse rating of I
N
≤40mA.
− The signal current circuit must be con-
nected in series with a fuse according to
IEC60127-2/VI,250VTwithafuse
rating of I
N
≤63mA.
− The transmitter current circuit must be
connected in series with a fuse according
toIEC60127-2/VI,250VTwithafuse
rating of I
N
≤40mA.
The fuses must be installed outside the haz-
ardous area.
Cable entry
Cable entry with M20x1.5 cable gland, 6 to
12mmclampingrange.
There is a second M20x1.5 threaded hole in
the housing that can be used for additional
connection, when required. The screw termi-
nals are designed for wire cross-sections of
0.2to2.5mm².Tightenthescrewsby0.5to
0.6Nm.
The wires for the set point must be connect-
ed to the terminals 11 and 12 located in the
housing.
Only use a current source.OVERLOADap-
pears on the display when the set point ex-
ceeds22mA.
The connection of a voltage source (U ≥ 7V
or U ≥ 2V when connected to the wrong
pole) can damage the positioner.
Only use a current source and never a volt-
age source!
In general, it is not necessary to connect the
positioner to a bonding conductor. Should
this be required, however, this conductor can
be connected inside the device.
Depending on the version, the positioner is
equipped with inductive limit switches and/
or a solenoid valve.
The position transmitter is operated on a
two-wire circuit. The usual supply voltage to
terminals31and32is24VDC.Takingthe
resistance of the supply leads into account,
the voltage at the position transmitter termi-
nals can be between at least 12 and
30VDCatthemaximum.
NOTICE
!

Samson 373 Series Specifications

General

Brand	Samson
Model	373 Series
Category	Valve Positioners
Language	English