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GB
Several functions and parameters of the A400 control unit can be
programmed to make the system more suitable to user needs and
safer in the various conditions of use.
“Automatic” function:
This function features an automatic closing cycle after the
programmed pause time; the pause time is factory set to 20
seconds but it can be modified to 5, 10, 20, 40 or 80 seconds.
“Condominium” function:
This function is useful when the automatic system is radio-
commanded by many people. If this function is active, each
command received triggers an opening manoeuvre that cannot be
interrupted by further commands except for emergency / safety
impulses (STOP, PHOTO 1, PHOTO 2) followed by an immediate
closing manoeuvre (AUX configured to “Close only”).
Pre-flashing:
This function activates the flashing light before the manoeuvre begins
for a time that can be programmed to 2, 4, 6, 8 or 10 seconds.
Close 4 seconds after photo:
During the automatic closing cycle, this function reduces the pause
time to 4 seconds after the PHOTO photocell is disengaged, i.e. the
gate closes 4 seconds after the user has passed through.
Leaf delay:
During the opening cycle, this function activates the M1 motor at a
set time after M2 in order to prevent the doors from getting caught
up in each other. This delay is always used in the closing cycle
(required by safety regulations) and is automatically calculated by the
control unit in order to obtain the same programmed delay for the
opening cycle.
Current sensitivity:
The control unit features a system which measures the current
absorbed by the two motors and uses this to detect the mechanical
stops and any obstacles during gate movement. Given that the
absorbed current depends on variable conditions (weight of gate,
various kinds of friction, gusts of wind, voltage variations, etc.), the
cut-in threshold can be changed.
There are 5 levels: 1 is the most sensitive, 5 is the least sensitive. It
is factory set at level 2, a value that should be fine for most
installations.
Auxiliary input AUX:
The control unit has an auxiliary input that can be configured in one
of the following functions:
• Type 1 partial opening:
this has the same function as the
STEP-BY-STEP input, i.e. it starts motor M2 only.
It only works if the gate is completely closed, otherwise it is
interpreted as a STEP-BY-STEP command.
• Type 2 partial opening:
this has the same function as the
STEP-BY-STEP input, i.e. it opens the two leafs half the total
programmed time. It only works if the gate is completely closed,
otherwise it is interpreted as a STEP-BY-STEP command.
• Open only:
this input carries out the opening manoeuvre only
using the Open-Stop-Open-Stop sequence.
• Close only:
this input carries out the closing manoeuvre only
using the Close-Stop-Close-Stop sequence.
• Photo 2:
performs the function of the “PHOTO 2” safety device.
• Disabled:
the input has no function.
The operating principle of the current sensitivity
device is based on variations in the current absorbed by
the motors; if at the start of the manoeuvre the motor is
blocked because the leaf is already at the mechanical
stop, there will be no variation in current and the obstacle
will therefore not be detected.
If the “current sensitivity” function (together with
other vital features) is suitably adjusted, the system will
comply with European standards, EN 12453 and EN
12445, which require techniques or devices to be used to
limit force and danger when automatic gates and doors
are moved.
If conditions make it necessary, the current sensitivity function can be
disabled and the control unit can work to timed cycles only, see the
“Searching with the current sensitivity device disabled” chapter.
If the current sensitivity function is disabled, the
motors continue at “full force” for the whole manoeuvre.
Make a careful risks analysis and fit other safety elements
to the system, if necessary, to reach the safety levels
envisaged by law.
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3) Programmable functions
3.1) Pre-set functions
The A4000 control unit features some programmable functions (see
the “Programmable functions” chapter) after the search phase.
These are initially pre-set in a typical configuration which satisfies
most automatic systems.
• Automatic closing
: after 20 seconds
• Leaf delay
: 4 seconds
• Pre-flashing
: disabled
• Auxiliary input
: type 1 partial opening
(motor M2 active only)
• Current sensitivity
: Level 2
These functions can be changed at any time, both before and after
searching, by carrying out a suitable programming procedure.
