Phototest - Nice mindyA60 Guía De Installación

2.2.3) Phototest

The "Phototest" function improves the reliability of the safety devices
and puts the control unit and safety photocells in "category 2"
according to EN 954-1 standard (ed. 12/1998). Each time a
manoeuvre is begun, the related safety devices are checked and the
manoeuvre is started only if everything is in order. 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 enable the Phototest function:
• Set Dip Switch 10 to ON
• Connect the safety devices as shown in fig.4a (when using
the PHOTO output alone), or as shown in fig.4b (when using
PHOTO1 as well).
The photocell transmitters are not powered directly from the service
output, but through the dedicated PHOTOTEST output. The
maximum current available at the PHOTOTEST output is 75mA
(3 pairs of photocells).
• Power the receivers directly from the service output of the
control unit (terminals 17-18).
If at a later time the Phototest function is no longer required, set Dip-
Switch 10 to the OFF position.
8
PHOTO
PHOTO
PHOTO1
The photocells are tested as follows: when a movement is required,
all the receivers involved in the movement are checked to make sure
they give their consent, then power to the transmitters is
disconnected; next all the receivers are checked to make sure they
signal the fact by withholding 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.
It is always a good idea to activate the synchronisation function by
cutting the jumpers on the transmitters. This is the only way to make
sure that two pairs of photocells will not interfere with each other.
Read the instructions for "SYNCHRONISED" operation in the
photocell manual.
If an input subjected to PHOTOTEST is not being used (see
PHOTO1) but you still require the phototest function, connect the
unused input with the PHOTOTEST output (terminals 19-24) using a
jumper; see fig. 4a.
PHOTO
PHOTO
PHOTO1
4 a
"PHOTO" with phototest
4 b
"PHOTO" and "PHOTO1" with
phototest