Notes On Connections; Initial Start-Up And Electrical Connections - Nice MC424 Instructions Et Avertissements Pour L'installation Et L'utilisation

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2.4.1 - Notes about connections
Most connections are extremely simple and many of them are direct connec-
tions to a single user point or contact. The following figures show examples of
how to connect external devices:
• Everything in stand by / Phototest connection
The "Everything in stand by" function is active as standard. It is excluded auto-
matically only when the Phototest function is activated. Note - The "Everything
in stand by" and Phototest functions are alternatives as one excludes the other .
The "Everything in stand by" function allows consumptions to be reduced. Three
types of connections can be obtained:
- with "Everything in stand by" active (energy saving); see electrical diagram in
fig. 5a
- standard connection: without "Everything in stand by" and without "Phototest";
see electrical diagram in fig. 5b
- without "Everything in stand by" and with "Phototest"; see electrical diagram in
fig. 5c
When the "Everything in stand by" function is active, 1 minute after the end of
a manoeuvre the control unit goes into "Everything in stand by", turning off the
Inputs and Outputs to reduce consumptions. The status is indicated by the "OK"
LED which begins to flash more slowly. WARNING – If the control unit is powered
from a photovoltaic panel ("Solemyo" system) or a buffer battery, the "Everything in
stand by" function must be activated as shown in the electrical diagram in fig. 5a.
When the "Everything in stand by" function is not required, the "Phototest" func-
tion may be activated. This verifies at the beginning of a manoeuvre that the
connected photocells operate correctly. To use this function, first connect the
photocells appropriately (see electrical diagram in fig. 5c) and then activate the
function. Note – When the phototest is activated, the inputs subjected to the
test procedure are PHOTO, PHOTO1 and PHOTO2 . If one of these inputs is not
used it must be connected to terminal no . 8 .
• Key switch connection
Example 1 (fig. 7a): How to connect the switch in order to perform the STEP-
BY-STEP and STOP functions
Example 2 (fig.7b): How to connect the switch in order to perform the STEP-
BY-STEP and one of the auxiliary input functions (PARTIAL OPENING, OPEN
ONLY, CLOSE ONLY ...)
Note – For electrical connections with the "Everything in stand by" function
active, see "Everything in stand by/Phototest function" in this paragraph 2 .4 .1 .
• Connection for Gate Open Indicator / Electric lock (fig. 8)
If the gate open indicator has been programmed, the output can be used as an
open gate indicator light. The light, flashes slowly during opening and quickly
during closing; If it is on but does not flash, this indicates that the gate is open.
If the light is off, the gate is closed. Se the output has been programmed as an
electric lock, it is activated for 3 seconds each time opening begins.
2.4.2 - STOP type input
The MC424 control unit can be programmed for two types of STOP input:
- NC type STOP for connecting up to NC type contacts.
- Constant resistance STOP. It enables the user to connect up to the con-
trol unit of devices with 8.2kΩ constant resistance (e.g. sensitive edges).
The input measures the value of the resistance and disables the manoeuvre
when the resistance is outside the nominal value. Devices with normally open
"NO" or normally closed "NC" contacts, or multiple devices, even of different
types, can be connected to the constant resistance STOP input, provided
that appropriate adjustments are made; see Table 1.
WARNING! – If the constant resistance STOP input is used to connect
devices with safety functions, only the devices with 8.2 KΩ constant
will resistance output guarantee the fail-safe category 3.
NO
In parallel (note 1)
NC (note 2)
8,2 KΩ In parallel
Notes to Table 1:
Note 1 – Any number of NO devices can be connected to each other in paral-
lel, with an 8.2 KΩ termination resistance (fig. 9a) . For electrical connections
with the "Everything in stand by" function active, see "Everything in stand by/
Phototest function" in this paragraph 2 .4 .1 .
Note 2 – The NO and NC combination can be obtained by placing the two con-
tacts in parallel, and placing an 8.2 KΩ resistance in series with the NC contact. It
is, therefore, possible to combine 3 devices: NO, NC and 8.2 KΩ (fig. 9b) .
Note 3 – Any number of NC devices can be connected in series to each other
and to an 8.2 KΩ resistance (fig. 9c) .
Note 4 – Only one device with an 8.2 KΩ constant resistance output can be
connected; multiple devices must be connected "in cascade" with a single 8 .2
KΩ termination resistance (fig. 9d) .
NO
NC
—
TABLE 1
1st device type:
NC 8,2 KΩ
(note 2)
In parallel
In series (note 3) In series
In series (note 4)
Only carries out the closing manoeuvre
PHOTO 2 function
No function

2.5 - Initial start-up and electrical connections

IMPORTANT! – Connections must be made exclusively by qualified per-
sonnel.
After powering up the control unit, check that all the LEDs flash rapidly for a few
seconds, then perform the following checks:
1. Check that there is a voltage of approximately 30Vdc on terminals 9-10. If
not, unplug the unit immediately and carefully check the connections and
input voltage.
2. After initially flashing rapidly, the P1 LED will indicate the control unit is work-
ing correctly by flashing regularly at 1 second intervals. When there is a vari-
ation in the inputs, the "P1" led will rapidly flash twice to show that the input
has been recognised.
3. If the connections are correct, the LED for the "NC"-type inputs will be on,
while those for the "NO" type inputs must be off. See fig. A and Table 2.
A
INPUT INPUT TYPE
STOP STOP NC
CONSTANT RESISTANCE
STOP 8.2 KΩ
PHOTO NC
FOTO1 NC
STEP-BY-STEP NO
AUX OPEN PARTIALLY type 1 - NO L5 Off
OPEN PARTIALLY type 2 - NO L5 Off
OPEN ONLY - NO
CLOSE ONLY - NO
FOTO2 - NC
4. Check that the relative LEDs switch on and off when the devices connected
to the inputs are operated.
5. Check that by pressing P2 both motors perform a short opening manoeuvre,
and the motor of the upper leaf starts first. Block the manoeuvre by press-
ing P2 again. If the motors do not start up for opening, invert the polarities
of the motor cables. If, however, the first one to move is not the upper leaf,
operate jumper E (fig. 2).
2.6 - Automatic search system for the limit switches
On the successful completion of the various controls, start the automatic search
system phase for the limit switches. This work is necessary as the MC424 con-
trol unit must "measure" how long the opening and closing manoeuvres take
This procedure is completely automatic and detects the mechanical opening
and closing stops by measuring the load on the motors.
Warning! – If this procedure has already been carried out, in order to
reactivate it, the user must first delete the memory (see the "Memory
de letion" chapter). In order to check whether the memory contains any
li mit switch parameters, turn the power supply to the control unit on
and then off again . If all the LEDs flash rapidly for approximately 6 sec-
onds, the me mory is empty. If, however, they only flash for 3 seconds,
the memory already contains some limit switch parameters.
Before starting limit switch searching, make sure that all the safety devices
are enabled (STOP, PHOTO and PHOTO1). The procedure will be immediately
interrupted if a safety device triggers or a command arrives. The leafs MUST
be positioned at approximately mid-travel.
Procedure – Press the P2 button (fig. 2) to start begin searching which
includes:
- Both motors open briefly.
- Motor closes the lower leaf until it reaches the mechanical closing stop.
- The upper leaf motor closes until it reaches the mechanical closing stop.
- The motor of the upper leaf begins to open.
- After the programmed delay, opening of the lower leaf begins. If the delay
is in s ufficient, block the search by pressing P1 (fig. 2), then modify the time
(see chapter 5).
- The control unit measures the movement required for the motors to reach the
opening mechanical stops.
- Complete closing manoeuvre. The motors can start at different times, the aim
is to prevent the leafs from shearing by maintaining a suitable delay.
TABLE 2
STATUS LED
L1 On
L1 On
L2 On
L3 On
L4 Off
L5 Off
L5 Off
L5 On
English – 3