●
If the actuator is equipped with a position transmitter (RWG, potentiometer):
-
Use suitable flexible and screened connecting cables.
-
Earth cable shield at both ends.
-
Permissible cable length in combination with a potentiometer is 10 m.
-
A separate cable has to be used if an RWG electronic position transmitter
is provided (intrinsically safe current circuit). This cable must NOT be
connected via actuator controls.
●
When using connecting cables, e.g. of the heater or switch, requiring direct
wiring from the actuator to the XK customer plug (XA-XM-XK, refer to wiring
diagram), these connecting cables must be subject to an insulation test in
compliance with EN 50178. Connecting cables of position transmitters (EWG,
RWG, IWG, potentiometer) do not belong to this group. They may not be sub-
jected to an insulation test.
Control box
For actuators with high nominal motor current (AUMA power class switchgear from
category A4), a control box is additionally required. Switchgear (reversing contactors)
will then be installed in the control box and not within the actuator controls. Control
box is mounted separately on the wall.
Figure 23: Example of cable installation with control box
[1]
Power supply, e.g. 3
∼
/PE/400V/50 Hz
[2]
Power supply of actuator controls (switchgear control)
[3]
Customer connection (XK) control contacts/signals
[4]
Motor connection/motor control
[5]
Feedback signals from actuator
[6]
Electronic position transmitter RWG (option) – intrinsically safe electric circuit
For the power supply cable, fuses have to be provided for short-circuit protection by
the customer. The fuses have to be adapted to the cross section of the cable, the
thermal overload relay in the control box, the switch contacts and the motor data
(refer to motor name plate).
27
SAEx 25.1 – SAEx 40.1 / SAREx 25.1 – SAREx 30.1
ACExC 01.2
Electrical connection
