CONTROL UNIT SERIES AUS X
8540643 - 26/08/2016 Rev.13
31
Use of K1 and K2 auxiliary contact elements.
For loads with higher voltage and current characteristics than those
indicated in the table above, use of auxiliary external relays or
contactors suitable for the load to be controlled is recommended.
The K1 and K2 auxiliary contactors or relays must be of the guided
contact safety type.
Referring to the table below, pay particular attention to the
configuration of the control contacts on terminal 20 and that of the
contacts of use.
Control contacts
K1-1 normally closed
K2-1 normally closed
Use contacts
K1-2 normally open
K2-2 normally open
Control contacts K1-1 and K2-1 (terminal 20) must be able to switch
a current of 20mA and a voltage of 24Vdc.
To increase the electrical life of internal relays A and B, it is
advisable to use anti-disturbance devices which must be connected
across the coils of K1 and K2.
Warnings regarding the connection cables.
For light curtain/control unit connections of more than 50m, cables
with a cross-section of at least 1mm
2
must be used.
It is good practice to separate the power supply of the control unit
from that of other electrical appliances (electrical motors, inverters,
frequency variators) or other sources of disturbance.
The path of the connection cables between the control unit ands
the sensors, the connection referring to the test command and
feedback contacts connected to terminal 20 must be different from
that of other power cables.
