Phototest - Nice Robo RO 300 Livret D'instructions

2.2.3) Phototest

"Phototest" is the best possible solution for safety devices in terms
of reliability and it puts the control unit and safety photocells in
"category 2" according to UNI EN 954-1 standard (ed. 12/1998).
Before every manoeuvre is begun, the relative safety devices are
checked and only if everything is in order will the manoeuvre start.
Should the test be unsuccessful (the photocell is blinded by the sun,
cables have short circuited, etc.) the failure is identified and the
manoeuvre is not carried out.
To obtain the Phototest function:
• Using the additional "PIU" board.
• Setting Dip Switch 10 to ON
• Creating a special layout in the safety device connections as
shown in fig. 4a so that the photocell transmitters are no longer
directly powered by the service output but from terminals 7 and
8 of the "PIU" board. The maximum current that the "PIU" board
can use on the "Phototest" output is 100mA (2 pairs of nice
photocells)
• Powering the receivers directly from the service output of the
control unit (terminals 5-6).
8
If at a later time the Phototest function is no longer required, lower Dip
Switch 10 and modify the connection layout as shown in fig. 4b.
The photocells are tested as follows: when movement is required, it
is first checked that all the receivers involved in the movement give
their consent, then power to the transmitters is disconnected after
which it is checked that all the receivers signal the fact by removing
their consent; the transmitters are then powered and the consent of
all the receivers is verified once more. Only if this sequence is
successfully carried out will the manoeuvre be performed.
Synchronism should always be activated on the two transmitters by
cutting the jumpers; this is the only way of ensuring that the two
pairs of photoelectric cells do not interfere with one another.
Check the instructions in the photocell manual regarding
synchronised operation.
If a "Phototest" input is not used (e.g.: Photo2) but the "phototest"
function is required, jumper the unused input as shown in fig. 4c.
4a
"Photo" and "Photo2" with "Phototest"
4b
"Photo" and "Photo2" without "Phototest"
4c
"Photo" with "Phototest"