24
•
The closing of the contact used to send the test command must not be
less than 10ms. This value is particularly important when sending of
the test command is to be managed automatically, for example using
a PLC.
•
System reset from the start of a test cycle takes place within 150ms.
This means that the output circuit, if the test has ended successfully,
cannot be energized before this time.
•
If a test command is sent before the current test command has been
completed, this is interrupted and a new test phase is initiated.
However, this operation is not recommended.
•
The contact used for the test must be able to switch a voltage of
approximately 24Vdc and a current of around 20mA.
Muting sensors.
Muting sensors.
The connections of the control unit to the muting sensors are shown in the
diagrams on pages 26 and 27 which specify the possible connections on
the terminals dedicated to the muting function (from 20 to 26).
The sensors used must comply with those specified in the technical data
on page 14. In particular, they must be of the DARK ON type.
Refer to table 1 on page 6 for configuration of the output of the muting
sensors.
With relay output:
F
contact open with beam not intercepted and with sensor not
contact open with beam not intercepted and with sensor not
powered
powered
With PNP static output:
F
output 24Vdc 100mA with the beam intercepted.
output 24Vdc 100mA with the beam intercepted.
When proximity sensors are used, connect the outputs of each pair in
parallel. The diagram given in fig. 14 shows how the two pairs of sensors
must be connected to the terminals of the control unit.
Characteristics of the external indicator device.
Characteristics of the external indicator device.
The control unit checks that the muting indicator device is present and
working correctly.
This device, which must comply with the electrical characteristics specified
in the technical data, must be an open circuit in the case of a fault.
Therefore, use of electronic lamps or those equipped with devices that
generate flashing is to be avoided in that, even if they do not emit, they
absorb current.
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