Reer AD SR2, Installation, Use And Maintenance Manual

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8
The RESTART command.
•
The RESTART command must be sent to the safety interface by
connecting terminal 6 to the +24VDC.
•
The contact used for the RESTART command must be
capable of switching 24VDC and 20mA (and guarantee a
closing time of > 300ms). This point is particularly important
when the RESTART command is managed automatically,
using a PLC for example.
•
The system restarts within 300ms from sending a RESTART
command (in MANUAL mode). This means that the output circuit
cannot be energized before that time.
•
To calculate the SYSTEM RESTART DELAY, add the restart
delay for any external K1/K2 contactors to the AD SR2
interface restart delay (300ms).
•
In case of manual operation, an external N/O switch can be
used that, when temporarily closed, generates the RESTART
command.
+
The Restart command must be located outside the danger zone, in a place
from which the danger zone and the entire work area concerned are
clearly visible.
+
The controls must not be accessible from inside the danger zone.
The CLEAR output.
The interface supplies a voltage (idle) of +24VDC to the
CLEAR
output
(terminal 15)
when the barriers are clear and the relays de-energized.
This output is internally protected to supply a maximum current of
100mA.
Characteristics of the output circuit.
The safety interface uses two safety relays with force guided contacts for
the output circuit.
To ensure correct insulation and avoid damage or premature ageing,
protect each output line with a delayed 4A fuse and check that the load
characteristics comply with the indications shown in the following table.
Minimum switching voltage 18 VDC
Minimum switching current 20 mA
Maximum switching voltage 250Vac
Maximum switching current 2A