FAAC 746 ER CAT User manual

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746ER & 780D
746ER & 780D

18
1) ATTENTION! To ensure the safety of people, it is important that you read
all the following instructions. Incorrect installation or incorrect use of
the product could cause serious harm to people.
2) Carefully read the instructions before beginning to install the product.
3) Do not leave packing materials (plastic, polystyrene, etc.) within reach
of children as such materials are potential sources of danger.
4) Store these instructions for future reference.
5) This product was designed and built strictly for the use indicated in this
documentation. Any other use, not expressly indicated here, could
compromise the good condition/operation of the product and/or be a
source of danger.
6) FAAC declines all liability caused by improper use or use other than that
for which the automated system was intended.
7) Do not install the equipment in an explosive atmosphere: the presence
of inflammable gas or fumes is a serious danger to safety.
8) The mechanical parts must conform to the provisions of Standards EN
12604 and EN 12605.
For non-EU countries, to obtain an adequate level of safety, the Standards
mentioned above must be observed, in addition to national legal
regulations.
9) FAAC is not responsible for failure to observe Good Technique in the
construction of the closing elements to be motorised, or for any
deformation that may occur during use.
10) The installation must conform to Standards EN 12453 and EN 12445.
Fornon-EUcountries,toobtainanadequate level of safety, theStandards
mentioned above must be observed, in addition to national legal
regulations.
11) Before attempting any job on the system, cut out electrical power .
12) The mains power supply of the automated system must be fitted with an
all-pole switch with contact opening distance of 3mm or greater. Use
of a 6A thermal breaker with all-pole circuit break is recommended.
13) Make sure that a differential switch with threshold of 0.03 A is fitted
upstream of the system.
14) Make sure that the earthing system is perfectly constructed, and
connect metal parts of the means of the closure to it.
15) The automated system is supplied with an intrinsic anti-crushing safety
device consisting of a torque control. Nevertheless, its tripping
threshold must be checked as specified in the Standards indicated at
point 10.
16) The safety devices (EN 12978 standard) protect any danger areas
against mechanical movement Risks, such as crushing, dragging,
and shearing.
17) Use of at least one indicator-light (e.g. FAACLIGHT ) is recommended
for every system, as well as a warning sign adequately secured to the
frame structure, in addition to the devices mentioned at point “16”.
18) FAAC declines all liability as concerns safety and efficient operation
of the automated system, if system components not produced by
FAAC are used.
19) For maintenance, strictly use original parts by FAAC.
20) Do not in any way modify the components of the automated system.
21) The installer shall supply all information concerning manual operation
of the system in case of an emergency, and shall hand over to the
user the warnings handbook supplied with the product.
22) Do not allow children or adults to stay near the product while it is
operating.
23) Keep remote controls or other pulse generators away from children,
to prevent the automated system from being activated involuntarily.
24) Transit is permitted only when the automated system is idle.
25) The user must not attempt any kind of repair or direct action whatever
and contact qualified personnel only.
26) Maintenance: check at least every 6 months the efficiency of the
system, particularly the efficiency of the safety devices (including,
where foreseen, the operator thrust force) and of the release devices.
27) Anything not expressly specified in these instructions is not permitted.
WARNINGS FOR THE INSTALLER
GENERAL SAFETY OBLIGATIONS
EC DECLARATION OF CONFORMITY FOR MACHINES
(DIRECTIVE 98/37/EC)
Manufacturer: FAACS.p.A.
Address: Via Benini, 1 - 40069 Zola Predosa BOLOGNA - ITALY
Declares that: Operator mod. 746ER with electronic control unit 780D
• isbuilt to be integrated into a machine ortobeassembledwithother machinery to create a machine under theprovisions
ofDirective98/37/EC;
• conforms to the essential safety requirements of the following EEC directives:
73/23/EECand subsequent amendment 93/68/EEC.
89/336/EECand subsequent amendment 92/31/EEC and 93/68/EEC
and also declares that it is prohibited to put into service the machinery until the machine in which it will be integrated or
ofwhichit will become a component has beenidentifiedanddeclared as conforming to the conditions of Directive98/
37/EC.
Bologna, 01 January 2004
TheManaging Director
A. Bassi

19
MODEL 746
Power supply (Vac +6% -10% 50-60Hz) 230
Absorbed power (W) 300
Reduction ratio 1 : 30
Type of pinion Z20 - Z16
Rack Module 4 - step 12.566
Max. thrust (daN) 50 (Z20) - 62,5 (Z16)
Max. Torque (Nm) 20
Winding thermal protection (°C) 120
Use frequency 70% (see graph)
Oil quantity (l) 1,8
Type of oil FAACXD220
Operatine ambient temperature (°C) -20 ÷ +55
Gearmotor weight (Kg) 14
Protection class IP 44
Gate max. weight (Kg) 400 (Z20) - 600 (Z16)
Gate speed (m/min) 12 (Z20) - 9,6 (Z16)
Gate max. length (m) (time-out) 50 (Z20) - 40 (Z16)
Clutch twin-diskin oil bath
Protective treatment cataphoresis
Equipment 780D
Limit-switch MSLorinductive
Gearmotor overall dimensions LxHxD (mm) see Fig. 2
Electric motor technical specifications
RPM 1400
Power (W) 300
Absorbed current (A) 1.5
Starting capacitor (µF) 25
Power supply (Vac +6% -10%; 50-60Hz) 230
% Freq.
Utilizzo
% Fréq.
d’utilisation
%
Benutzungs-
frequenz
% Frecuencia
de utilización
%
gebruiks
-
frequentie
%
Duty
Cycle
0
10
20
30
40
50
60
70
80
90
100
1234567 89101112
Tempo (h) Time (h) Temps (h) Zeit (h) Tiempo (h) werktijd (h)
These instructions apply to the following models:
746 ER Z16 - 746 ER Z20 - 746 ER CAT - 746 ER RF
The FAAC mod. 746 automated system for sliding gates is an
electro-mechanicaloperatortransmittingmotion to the sliding leaf
via a rack or chain pinion appropriately coupled to the gate.
Thenon-reversing system ensuresthe gate ismechanically locked
whenthemotorisnotoperatingand,therefore,no lock needs to be
installed.
The gearmotor is equipped with a mechanical clutch which,
combinedwithanelectronicdevice, offersthenecessary adjustable
anti-crushingsafetyandguarantees stopping or reversing the gate
movement.Ahandy manual release makesitpossibleto move the
gate in the event of a power cut or malfunction. The electronic
control equipment is equipped with a gearmotor and is housed
insidethe operator.
The 746 automated system was designed and manufactured to
control access of vehicles. Avoid any other use whatever.
Tab. 1 TECHNICALSPECIFICATIONS OF 746 GEARMOTOR
where:
Ta = opening time
Tc = closing time
Tp = pause time
Ti = timeof interval betweentwo complete cycles
Usefrequency graph
Securing corners
Pinion
Limit sensor switch
Operator cover
780 D Control board
Adjustment screw for
anti-crushing clutch
Oil filling plug
Operator earthing
Lever operated release system
Protective side panels
Cover for 780D control board
AUTOMATEDSYSTEM746&ELECTRONICCONTROLUNIT780D
1. DESCRIPTION AND TECHNICAL SPECIFICATIONS
1.1. MAXIMUM USE CURVE
The curve makes it possible to establish maximum work time (T)
accordingto use frequency(F).
E.g.: The 746 gearmotor can operate non-stop at 70% use
frequency.
Toensure efficient operation,operatein the workrange below the
curve.
Important:The curve is obtained at a temperature of 24°C. Exposure
to the direct sun rays can reduce use frequency down to 20%.
Calculation of use frequency
Thepercentageofeffectiveworktime(opening+closing)compared
to total time of cycle (opening + closing + pause times).
Calculationformula:
Ta + Tc
%F = X 100
Ta + Tc + Tp + Ti
Fig. 1












20
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 2
Fig. 3
2. DIMENSIONS
3. ELECTRICEQUIPMENT(standardsystem)
To make the connections efficiently, allow the cables to
project by about 40 cm from the hole (Figs.5-6 ref.) of the
foundation plate.
4. INSTALLATIONOFTHE AUTOMATEDSYSTEM
4.1. PRELIMINARYCHECKS
To ensure safety and an efficiently operating automated system,
makesure thefollowing conditions are observed:
• Thegate structure must besuitableforautomation.Thefollowing
arenecessary inparticular:wheeldiameter mustbeinproportion
tothe weight of thegatetobeautomated,anupperguide must
be provided, plus mechanical stop limits to prevent the gate
derailing.
• The soil must permit sufficient stability for the foundation plinth.
• Theremust be no pipes or electric cablesintheplinthexcavation
area.
• Ifthegearmotorisexposedtopassingvehicles,install, if possible,
adequatemeans of protectionagainst accidental impact.
• Checkif an efficientearthing is availablefor connection tothe
gearmotor.
4.2. MASONRY FOR FOUNDATION PLATE
1) Assemble the foundation plate as shown in figure 4.
2) The foundation platemustbelocated as shown infigure5 (right
closing) or figure 6 (left closing) to ensure the rack and pinion
meshcorrectly.
3) Prepare a foundation plinth as shown in fig.7 and wall the
foundation plate, supplying one or more sheaths for routing
electriccables. Using aspirit level, checkif the plate isperfectly
level. Wait for the cement to set.
4) Lay the electric cables for connection to the accessories and
power supply as shown in figure 3.
4.3. MECHANICALINSTALLATION
1) Assemble the securing corners and anti-vibration spacers on
the operator as shown in Fig. 8.
2) Open the cover,unscrewing the securing screws.
3) Place the operator on the plate, using the suppliedwashers and
nuts as shown in Fig. 9.
During this operation, route the cables through the duct inside
the lower half-casing of the operator (Fig.10 - Ref. A).
Toaccess the electronicequipment, route thecables through
theappropriate hole, using the suppliedrubber cable-clamp.
Make absolutely sure to unsheathe all the cables so that the
clamp holds single cables only (Fig.10 - Ref. B).


Operator 746
with 780D equipment
Photocells
Key-operated push-button
Flashing lamp
Radio receiver

21
AB
Fig. 8
Fig. 12
Fig. 10
Fig. 11
Fig. 9
Fig. 13
5) Secure the gearmotor to the foundation plate, tightening the
nuts as in Fig.12.
6) Prepare the operator for manualoperatingmodeasdescribed
in chapter 8.
4.4. INSTALLINGTHE RACK
4.4.1. STEEL RACK TO WELD (Fig.13)
1) Place the three threadedpawlsonthe
rackelement, positioning thematthe
topof the slot.In this way, theslot play
will enable any adjustments to be
made.
2) Manually take the leaf into its closing
position.
3) Lay the first piece of rack level on the
pinionand weld the threadedpawl
on the gate as shown in figure15.
4) Move the gate manually, checking if the rack is resting on the
pinion, and weld the second and third pawl.
5) Bring another rack element near to the previous one, using a
pieceof rack (as shown infigure 16) tosynchronise the teeth of
thetwo elements.
6) Move the gate manually and weld the three threaded pawls,
thus proceeding until the gate is fully covered.
Fig. 14
4.4.2. STEEL RACK TO SCREW (Fig. 14)
1) Manually take the leaf into its closing position.
2) Lay the first piece of rack level on
the pinion and place the spacer
between the rack and the gate,
positioning it at the top of the slot.
3) Mark the drilling point on the gate.
Drill a Ø 6,5 mm hole and apply
thread with a Ø 8 mm male tap.
Screwthe bolt.
4) Move the gate manually,checking
if the rack is resting on the pinion,
andrepeat the operations at point
3.
5) Bring another rack element near to the previous one, using a
pieceof rack (as shown infigure 16) tosynchronise the teeth of
thetwo elements.
6) Move the gatemanuallyandcarry out the securingoperations
as for the first element, thus proceeding until the gate is fully
covered.
Fig. 14bis
4.4.3. NYLON RACK TO SCREW (Fig.14bis)
1) Manually take the leaf into its
closing position.
2) Lay the first pieceof theracklevelon
thepinionandmarkthe drilling point
on the gate; drill Ø 4 mm and screw
the self-tapping screw 6 x 20 mm to
therelevant reinforcing plate.
3) Move the gatemanually, checking
if the rack is resting on the pinion,
and repeat the operations at point
2.
4) Bring another rack element near to the previous one, using
a piece of rack (as shown in figure 16) to synchronise the
teeth of the two elements.
5) Move the gate manually and carry out the securing
operations as for the first element, thus proceeding until the
gate is fully covered.

22
Fig. 15
Fig. 16
Fig. 19
Fig. 21
Fig. 20
Notes on rack installation
• Makesure that, duringthe gate travel,all the rack elementsdo
not exit the pinion.
• Do not, on any account, weld the rack elements either to the
spacers or to each other.
• When the rack has been installed, to ensure it meshes
correctly with the pinion, we advise
you to lower the gearmotor position
by about 1.5 mm (Fig.17).
• Manually check if the gate
habitually reaches the mechanical
stop limits and make sure there is no
friction during gate travel.
• Do not use grease or other lubricants
between rack and pinion.
4.5. INSTALLATION OF CHAIN PINIONS
In the versions for applications with chain and idle transmissions,
a Z16 or Z20 chain pinion must be installed. Proceed as follows:
4.5.1. MOD. 746 ER CAT (Figs. 18 - 19)
1) Insert the spring pin on the shaft, using a hammer.
2) Fit the chain pinion on the shaft, making the pinion seats
coincide with the spring pin and tighten the screw with the
appropriate washers.
Fig. 17
4.5.2. MOD. 746 ER RF (Figs. 20 - 21)
1) Insert the spring pin on the shaft, using a hammer.
2) Fit the idle transmissions bracket on the gearmotor flange,
using the four screws (M5 x 12) and the appropriate
washers , in the kit as shown in Fig. 20.
3) Fit the chain pinion on the shaft, making the pinion seats
coincide with the spring pin and tighten the screw  and
the appropriate washers  and .
4) Pass the chain as shown in Fig. 21 ref. A and install the
housing with screw  and washer  as in Fig. 20.
5) In case of operators with MLS limit switches, arrange the
supports for the positioning of the magnets supplied while
observing the dimensions given in fig. 21 ref. B.








0÷10 mm
5÷1
2
mm
Fig. 18
A
B

23
–
+
DL
Led
F1
J1
J2
Led
J5
F
J7
F2
J8
J6
Fig. 22
DL SIGNALLINGANDPROGRAMMINGDISPLAY
Led INPUTSSTATUSCONTROL LED
J1 LOWVOLTAGETERMINALBOARD
J2 CONNECTORFORDECODER/MINIDEC/RPRECEIVER
J5 CONNECTORFORMOTORSTARTINGCAPACITOR
J6 MOTORANDFLASHINGLAMPCONNECTIONTERMINALBOARD
J7 230Vac POWER SUPPLYTERMINAL BOARD
J8 DOUBLECONNECTOR J8 - LIMIT-SWITCH QUICK FIT
F1 MOTOR AND TRANSFORMER PRIMARY WINDING FUSE (F 5A)
F2 LOWVOLTAGE AND ACCESSORIESFUSE (T 800mA)
F"F"PROGRAMMING PUSH-BUTTON
–"–"PROGRAMMING PUSH-BUTTON
+"+"PROGRAMMINGPUSH-BUTTON
1OPENA(totalopening)
2OPENB(partialopening)
3FSW-OP(openingsafetydevices)
4FSW-CL(closingsafety devices)
5STOP
6SAFE(“edge”safetydevices)
7-(negative forpower supplyto accessories)
8-(negative forpower supplyto accessories)
9+24V (supply to accessories)
10 +24V (supply to accessories)
11 FSW-TX(negative for emittingphotocells - FAILSAFE)
12 W.L.(negativefor indicatorlight)
J1 CONNECTOR
Power supply V~ (+6% -10%) 230
Absorbed power (W) 10
Motor max. load (W) 1000
Accessories max. load (A) 0,5
Operating ambient temperature -20 °C +55 °C
Protection fuses 2 (see fig. 22 and par. 5.3)
Function logics: Automatic / “Stepped” automatic / Semi-automatic / Safety
devices / Semi-automatic B / Dead-man C / “Stepped” semi-automatic / Mixed B/C
logic
Work time Programmable (from 0 to 4,1 min.)
Pause time Programmable (from 0 to 4,1 min.)
Thrust force Adjustable over 50 levels
Terminal board inputs: Open - Partial Open - Opening safety devices - Closing safety
devices - Stop - Edge - Power supply+Earth
On-connector inputs Opening and closing limit-switch -
Motorcapacitor
Terminal board outputs: Flashing lamp - Motor - 24 Vdc accessories power supply
- 24 Vdc indicator-light / Timed output / Electric lock command - 'traffic lights' - Fail
safe
Rapid connector 5-pin card connection for Minidec, Decoder or RP receivers
Programming 3 keys (+, -, F) and display, "basic" or "advanced" mode
Basic mode programmable functions: Function logic - Pause time - Thrust Force
- Opening-closing direction
Advanced mode programmable functions: Torque at initial thrust - Braking - Fail safe
- Pre-flashing - Indicator-light/Timed output/Electric lock or 'traffic lights' command -
Opening and closing safety devices logic - Encoder/ Anti-crushing sensitivity -
Decelerations - Partial opening time - Work time - Assistance request - Cycle counter
5.2. TECHNICALSPECIFICATIONS
5.1. WARNINGS
Important: Before attempting any work on the control board
(connections,maintenance),alwaysturnoffpower.
- Install, upstream of the system, a differential thermal breaker with
adequatetrippingthreshold.
-ConnecttheearthcabletotheterminalonJ7connectoroftheboard,
and to the bush on the operator (figs. 22 and 40).
-Alwaysseparatepowercablesfromcontrolandsafetycables(push-
button, receiver,photocells, etc.).Toavoidanyelectricnoise,use
separatesheathsorashieldedcable(withearthedshield).
5. CONTROL BOARD 780D
5.3. LAYOUTAND COMPONENTS

24
SAFE
+
+
OPENB
OPENA
OP
CL
J1
J5

BLUE
SAFE
+
+
OPEN
B
A
OPEN
OP CL
SAFE
+
+
OPEN
B
A
OPEN
OP CL
SAFE
+
+
OPEN
B
A
OPEN
OP CL
Fig. 23
Fig. 24
Fig. 25
Fig. 26
Fig. 27
Fig. 28
5.4.1. Connection of photocells and safety devices
Before connecting the safety devices and photocells we advise
you to select the type of operation according to the movement
area they have to protect (see fig.24 for example):
Opening safety devices: they are tripped when an obstacle is
detected only during gate opening movement. They
cause immediate closure and resumption of opening
motion on release (see programming in par. 5.5.2.)
Closing safety devices: they are tripped when an obstacle is
detected only during gate closing movement. They
cause re-opening, either immediate or on release
(see programming in par. 5.5.2.)
Opening/closing safety devices: they are tripped during the
gate opening and closing movements. They cause
stopping and restart motion on release.
"Edge" safety devices: they are tripped during the gate opening
and closing movements. They cause immediate
reversal of motion and stopping after two seconds.
Encoder: it is tripped if there is an obstacle during gate opening
and closing movements. It causes immediate reversal
of motion and stopping after two seconds.
N.B. If two or more safety devices have the same function
(opening, closing, opening and closing, edge), the contacts
must be connected to each other in series (fig. 25).
N.C. contacts must be used.
N.B: If safety devices are not used, jumper connect the terminals
as shown in fig. 26.
The most common photocell and safety device lay-outs are
shown below (from fig. 27 to fig. 34).
230 Vac (max.
60W)
230Vac
50-60Hz
TOTAL
OPEN
PARTIAL
OPEN
STOP
For connection of the
photocells and safety
devices, see paragraph
5.4.1.
LIMIT-SWITCH
24 Vcc
max. 3W
Capacitor
5.4. ELECTRIC CONNECTIONS
Closing
photocells
Closing photocells
Opening or
opening/closing
photocells
"Edge" safety devices
Connection of two N.C. contacts in series
(e.g. Photocells, Stop, Edge, etc.)
Connection of no safety device
Connection of a closing safety device and an opening
safety device
Connection of an "edge" safety device

25
SAFE
+
+
OPEN
B
A
OPEN
OP
CL
RX OPTX OP
SAFE
+
+
OPEN
B
A
OPEN
OP CL
RX OP/CLTXOP/CL
RX OP TX OP
SAFE
+
+
OPEN
B
A
OPEN
OP
CL
SAFE
+
+
OPEN
B
A
OPEN
OP CL
SAFE
+
+
OPEN
B
A
OPEN
OP
CL
Fig. 30
Fig. 31 Fig. 33
Fig. 32
Fig. 29
Connection of a pair of closing photocells
Connection of a pair of opening photocells
Connection of a pair of opening photocells, a pair of closing
photocell and an edge safety device
Connection of a pair of closing photocells, a pair of opening
photocells and a pair of opening/closing photocells
Connection of two pairs of closing photocells and two
edge safety devices

26
RX OP/CL
TX OP/CL
SAFE
+
+
OPEN
B
A
OPEN
OP CL
Fig. 34
Fig. 35
5.4.2. J7 Terminal board - Power supply (fig. 23)
POWERSUPPLY (terminals PE-N-L):
PE: Earth connection
N:Power supply ( Neutral )
L:Power supply ( Line )
NB.:For correct operation, the board must be connected to the
earth conductor in the system. Install an adequate differential
thermal breaker upstream of the system.
Toinstallseveral partial opening pulse generators, connect
the N.O. contacts in parallel (fig.35).
FSW OP - Openingsafety devicescontact (terminal3): Thepurpose
oftheopeningsafetydevicesistoprotecttheleafmovement
area during opening. During opening, in the A-AP-S-E-EP
logicsthesafetydevicesreverse themovementofthegate,
or stop and restart the movement when it is released (see
advanced programminginChpt. 5.5.2).Duringtheopening
cyclein logics B,C and B/C,they interruptmovement.They
neveroperate during the closingcycle.
IftheOpeningsafetydevicesare engaged when the gate
isclosed,they prevent the opening movement.
Toinstallseveralsafetydevices,connecttheN.C.contactsin
series(fig.25).
NB.: If no opening safety devices are connected, jumper
connect inputs FSW OP and -TX FSW (fig. 26).
FSWCL - Closing safety devices contact (terminal4): The purpose
oftheclosingsafetydevicesistoprotectthegatemovement
area during closing. During closing, in the A-AP-S-E-EP
logics, the safety devices reverse the movement of the
gate,or stop and reverse the movementwhenitisreleased
(see advanced programming in Chpt. 5.5.2). During the
closingcycleinlogicsB,CandB/C,theyinterruptmovement.
Theynever operate duringtheopeningcycle.IftheClosing
safety devices areengaged when thegate is open,they
preventtheclosingmovement.
Toinstallseveralsafetydevices,connecttheN.C.contacts
inseries (fig.25).
NB.: If no closing safety devices are connected, jumper
connect terminals FSW CL and -TX FSW
(fig. 26).
STOP - STOPcontact(terminal5): any device (e.g.a push-button)
which, by opening a contact, stops gate movement.
Toinstall several STOP devices,connectthe N.C. contacts
in series (fig. 25).
NB.: If STOP devices are not connected, jumper connect
the STOP and -terminals.
SAFE- EDGEsafetydevicecontact(terminal6): The purposeofthe
"edge"safetydeviceisto protect the leaf movement area
during opening/closing. In all logics, during opening and
closing, the safety device reverses gate movement for 2
seconds.If the safetydevicesoperate again duringthe 2-
secondsreversingtime,itstopsmovement(STOP)withoutany
reversing.
Ifthe Edgesafetydeviceisengagedwhile thegateisclosed
oropen, it prevents movement.
Toinstallseveralsafetydevices,connecttheN.C.contactsin
series(fig.25).
NB.: If edge safety devices are not connected, jumper
connect the SAFE and - inputs (fig. 26).
–
Negative for power supply to accessories (terminals 7
and 8)
+ 24Vdc-Positiveforpowersupplytoaccessories(terminals
9 and 10)
Important:Accessories max. load is 500 mA. To calculate absorption
values, refer to the instructions for individual accessories.
Connection of a pair of closing photocells and a pair of
opening/closing photocells
Connection of two N.O. contacts in parallel
(e.g. Open A, Open B)
5.4.3. J6 Terminal board - Motors and flashing lamp
(fig. 23)
MOTOR - (terminals MOT-C, MOT-1, MOT-2): Motor connection
(see Par. 6.5).
LAMP - (terminals LAMP L, LAMP N): Flashing lamp output 230Vac
max 60W.
5.4.4. J1 Terminal board - Accessories (fig. 23)
Consult the relevant tables for a detailed description of
operation in the different logics
OPEN A - “Total Opening” command (terminal 1): any pulse
generator(push-button, detector, etc.)which,byclosinga
contact, commands total opening and/or closing of the
gateleaf.
Toinstall several totalopening pulse generators,connect
the N.O. contacts in parallel (fig. 35).
OPENB- “Partial opening”or“Closing”command (terminal 2):any
pulse generator (push-button, detector, etc.) which, by
closing a contact, commands partial opening and/or
closingofthe gate leaf. IntheB, C andB/Clogics, it always
commandsgate closure.