8
Characteristics of the output circuit.Characteristics of the output circuit.
The output circuit of the AU S-TWIN control unit utilises two safety relays
with force guided contacts.
The manufacturer’s rating for these relays exceeds the voltage and current
indicated in the specifications; however, in order to ensure their correct
insulation and prevent early damaging or ageing, it is necessary to protect
every output line with a delayed 3.15A fuse and to make sure that the
charateristics of the load correspond with the indications contained in the
following table.
Minimum switching voltage 15 Vdc
Minimum switching current 20mA
Maximum switching voltage 125Vac
Maximum switching current 2A
Use of auxiliary contactors K1 and K2.Use of auxiliary contactors K1 and K2.
For loads with higher voltage and current characteristics than those
indicated in the previous table, we recommend the use of external
auxiliary contactors or relays that are suitable for the load to be tested.
• The auxiliary relays or contactors K1 and K2 must be of the safety
type with force guided contacts.
• With reference to the following table, please note the
configuration of the test contacts on terminals 5 and 6 and that of
the operating contacts.
Relay K1 Relay K2
Test contacts K1-1 normally open K2-1 normally closed
Operating contacts K1-2 normally closed K2-2 normally open
• The test contacts K1-1 and K2-1 on terminals 5 and 6 must be
capable of switching 20mA and 24V
dc
.
• To increase the electric life of the internal relays A and B, suitable
anti-disturbance devices should be used. These must be connected
to the ends of the K1 and K2 coils.
Warnings regarding the connection cables.Warnings regarding the connection cables.
• For connections over 50m long between the photoelectric sensors
and control units, use cables with a cross section area of at least 1
mm
2
.
• The control unit power supply should be kept separate from that of the
other electric power equipment (electric motors, inverters, frequency
changers) and other sources of disturbance.
• The connection cables between the control unit and sensors, the
connection of the test command and feedback contacts connected
to terminals 5 and 6 must follow a different route to that of the
other power cables.
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