Electrical Connection - Samson 3274 Mounting And Operating Instructions

5.7 Electrical connection

DANGER
!
Risk of fatal injury due to electric shock.
Î Upon installation of the electric cables,
you are required to observe the regula-
tions concerning low-voltage installations
according to DIN VDE 0100 as well as
the regulations of your local power sup-
plier.
Î Only use a suitable supply voltage 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.
Î Only perform the electrical connection
after switching off the supply voltage.
Make sure the supply voltage cannot be
switched on again 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 TRI-
AC and a relay in the motor electronics.
EB 8340 EN
How to proceed:
Î Unscrew and remove the side housing
cover. Guide the cables through the ca-
ble glands on the housing to the termi-
nals and connect them (see Fig. 5-5 to
Fig. 5-7 or circuit diagram 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 apply to the accessories
(Fig. 5-5 to Fig. 5-7) as well.
Î Do not connect the limit contacts to the
terminal block, but to a separate screw
terminal.
For the version with positioner (see Fig. 5-6)
and position transmitter (Fig. 5-7), output
signals, which are proportional to the valve
travel, can be provided at the terminals 31,
32, 33 to be used for position feedback (sig-
nal increases as the actuator stem retracts).
Î Jumper the terminals 31 and 32 when
the voltage output is used for position
feedback.
Fuse
A holder with a fine-wire fuse (see the 'De-
sign and principle of operation' section) on
the motor electronics board protects the actu-
ator and contacts of the external controller.
Installation
5-9