Retrofitting Limit Contacts - Samson 3274 Mounting And Operating Instructions

5.4 Retrofitting limit contacts
To install the limit contacts, the following ret-
rofit parts are required depending on the
equipment:
− Basic unit: order no. 1690-1201
− Mechanical limit contacts:
order no. 1690-1206
Note
The basic unit is only required when the ac-
tuator does not yet contain limit contacts, re-
sistance transmitters, positioner or position
transmitter.
Depending on the version, a maximum of
three limit contacts can be installed (see the
'Design and principle of operation' section).
When only one or two contacts are used, we
recommend mounting a switch carrier first
and leave the bottom mounting space free.
This facilitates connection of the single wires.
Installing the basic unit
1. Open the side housing cover.
2. Place the gear rack on the control rod in
the actuator and secure it against dis-
placement with the retaining washer (3).
3. Align the gear rack.
4. For retrofitting positioners, position trans-
mitters and resistance transmitters, mount
the required potentiometer on the poten-
tiometer carrier. Mount the potentiometer
carrier together with the plugged-on
shaft.
EB 8340 EN
Mounting the mechanical limit contact
1. Install the switch carrier.
2. Mount the contact cam and fasten with
the hexagonal wrench included in the
delivery.
3. Insert the switch unit.
4. Install the switch carrier above the
switch.
Tip
When a positioner or position transmitter is
installed, we recommend unfastening them
to make sufficient space for mounting the
switch carrier.
5. Refasten the positioner or position trans-
mitter.
6. Connect the wiring as shown in sec-
tion 5.7.
7. Refasten the side housing cover.
Installation
5-5