Electrical Connections - Samson 3274 Mounting And Operating Instructions

Electrical connections

5 Electrical connections
DANGER
!
Risk of electric shock.
− Upon installation of the electric cables, you
are required to observe the regulations
concerning low-voltage installations ac-
cording to DIN VDE 0100 as well as the
regulations of your local power supplier.
− Only use a suitable power supply which
guarantees that no dangerous voltages
reach the device in normal operation and
in the event of a fault in the system or any
other system parts.
− Connect the actuator to the electrical net-
work only after the power supply is first
switched off. Make sure the power cannot
be switched on unintentionally.
Note
Special motor electronics ensures that the
contacts of the controller's output relay (e.g.
for three-step control) are protected and only
loaded with relatively low control capacities
when the actuator is wired according to the
circuit diagrams.
The power switching is performed by a
TRIAC and a relay in the motor electronics.
14
How to proceed:
Î Unscrew the side housing cover. Guide
the cables through the cable glands on
the housing to the terminals and connect
them (see Fig. 4 to Fig. 6 or circuit dia-
gram stuck inside the housing cover).
If required, two additional cable glands can
be mounted after carefully knocking out the
blanking plugs.
Î Connect the grounding conductor to the
separate PE terminal on the inside hous-
ing wall.
Accessories
The wiring diagrams (Fig. 4 to Fig. 6) apply
to the accessories as well.
Î Do not connect the limit contacts to the
terminal block, but to a separate screw
terminal.
For the version with positioner (Fig. 5) and
position transmitter (Fig. 6), output signals,
which are proportional to the valve travel,
can be provided at the terminals 31, 32, 33
to be used for position feedback (signal in-
creases as the actuator stem retracts).
Î Jumper the terminals 31 and 32 when
the voltage output is used for position
feedback.
Fuse protection
A holder with a fine-wire fuse (see
page 19, Fig. 7, item 1) on the motor
electronics board protects the actuator and
contacts of the external controller.
EB 8340 EN