CARLO GAVAZZI NA13CT User manual

User Manual
User Manual
SAFETY
SAFETY MODULE MODULE
NA13CT
NA13CT

2
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . .3
2. PACKAGE CONTENTS . . . . . . . . . . . . . . . . . . . . .3
3. FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
4. INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4.1
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.2
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3
P o w e r s u p p ly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.4
E -S T O P c o nne c tio n . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.5
S T A R T C irc u it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.6
S afe ty O u tp u ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 .7 A u x iliary o u tp u t ..........................5
5. OPERATING MODE . . . . . . . . . . . . . . . . . . . . . . . .5
6. TEST & ACTIVATION . . . . . . . . . . . . . . . . . . . . . . .6
7. USAGE PRECAUTIONS . . . . . . . . . . . . . . . . . . .6
8. INSPECTIONS AND MAINTENANCE . . . . . . . . . .7
9. APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .8
10. TECHNICALDATA . . . . . . . . . . . . . . . . . . . . . . . .10
T
Table ofContents able ofContents

1. INTRODUCTION
This user manual must be read
and understood completely,prior
to carrying out any operation on
the module,by personnel dealing
with all the activities of the
NA13CT safetymodule. It must be
stored in a dryclean place close to
where the module is used for easy
consultation.
All the operations described in this
manual must be carried out by
carefully following all the indica-
tions given exclusively by spe-
cialised personnel.
Contact Carlo Gavazzi and do not
carry out any operations on the
safetymodule,ensuring the safety
ofthe operators,ifthere are any
doubts over the contents ofthis
manual,or ifthere is a fault or a
malfunction.
The user ofthe module is respon-
sible for the evaluation ofthe risks
ofthe entire system.
Based on the evaluation and on the
standards in force in the countryof
use,the user decides with com-
plete responsibility that the func-
tions described in the user manual
are suitable for use on his machine.
W henever the NA13CT safety
module is improperly used,by not
followingonlyand all the indications
ofthis manual or whenever these
indications are partially,incorrectly
or incompletely applied by person-
nel unspecialised and/or insuffi-
cientlyinformed on the contents of
this manual and the machine safety
directives, Carlo Gavazzi is not
responsible for the functioning of
the NA13CT and its capacity to
guarantee the operator’s safety.
The NA13CT module does not
require internal maintenance:ifit is
tampered or ifthe case is opened,
the module looses its safety func-
tions and the guarantee is
annulled.
2. PACKAGE CONTENTS
The package contains:
• n.1 safetymodule model NT13CT
• n.1 user manual
Ifanyanomalies are found with the
package,its contents or with the
safety module do not install and
contact Carlo Gavazzi.
3. FUNCTION
The safety module NA13CT is
designed to control emergency
stop (E-STOP) devices. It has
been designed according to safety
category3 ofEN 954-1.
Three N.O. force-guided and
delayed safety outputs and one
auxiliary delayed N.C. output are
available, so that the NA13CT
safety module is suitable for cate-
gory 1 E-STOP (EN 60204-1)
applications.
The delayis set upto1 second.
3

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4. INSTALLATION
4.1 Warning
• The NA1/3-C-T safety module
must be installed following the
standards in force in the country
of use, when the machine is not
powered and with no dangers for
the operator, on the machine’s
electrical board in a dry and
clean place (minimum protection
degree: IP54), fixed on the spe-
cial DIN rail.
• If the safety module is tampered,
it can not ensure the safety of
the operator any more and the
warranty is void.
• To avoid interference due to cou-
pling, run the limit switches con-
necting conductors separately
from the power conductors.
• Avoid the risk of short-circuits
between the terminals caused
by free cables, wires or material
that could come close to the
safety module.
• Avoid installation during storms.
Fig. 1 - NA13CT diagram
TERM.CONNECTION
A1 +24VDC / 18VAC
A2 GND / 18 VAC
S1-S2 Feedback loop and
START terminals
13-14
23-24
33-34
N.O. Safety delayed outputs
41-42 N.C. Auxiliary delayed
output
Tab. 1: Terminal description

5
• Do not dispose of the packaging
in the environment.
4.2 Wiring
It is recommended to use conduc-
tors with section and length ade-
quate to the terminals, currents
and distances involved, ensuring
that the conductors are not exces-
sively tight, that their positioning
avoids potential cuts or squashing
and that they are not in the way of
people or things.
4.3 Power supply
Connect the A1 & A2 terminals to
the power supply source via the
E-STOP device(s).
4.4 E-STOP connection
The NA13CT safety module can
be connected to one or more sin-
gle-channel or double-channel E-
STOP devices (see the applica-
tion examples).
The E-STOP contact(s) must be
closed when the E-STOP button is
not pushed, open when the E-
STOP is pushed.
The contacts of the E-STOP must
be connected between the power
supply terminals of the midule (A1
and eventually A2) and the power
supply source, so that when the
E-STOP is pushed the safety
module is switched off.
4.5 START Circuit
The safety module can be config-
ured for manual START (not mon-
itored for welding fault) or auto-
matic START.
To set up the manual START con-
figuration, it is necessary to con-
nect a N.O. pushbutton to the S1-
S2 terminals, while to set up the
automatic START configuration
the two terminals must be short-
circuited (directly or via the
N.C.contacts of external relays).
4.6 SafetyOutputs
Three N.O. voltage-free safety
outputs are available between the
13-14, 23-24 and 33-34 terminals:
their contacts are closed when the
safety module is correctly pow-
ered, the E-STOP is not pushed,
and the START circuit has been
activated, as described in this
user manual.
4.7 Auxiliary output
One N.C. auxiliary voltage-free
relay output is available between
the 41-42 terminals. It can be
used only for signalling functions
and not for safety functions.
5. OPERATING MODE
With manual START configuration,
the safety outputs close and the
auxilary output opens when the E-
STOP is not pushed and the N.O.
START pushbutton is pressed.
With automatic START configura-
tion, the safety outputs close and
the auxilary output opens as soon
as the E-STOP is released (not

6
pushed).
The CH1 &CH2 LEDs turn on as
soon as the safety outputs close.
Pushing the E-STOP button leads
to a safety condition, forcing the
safety outputs to an open status
when the delay has expired. The
POW ER,CH1 &CH2 LEDs turn off.
A new operating cycle is possible
only after releasing the E-STOP
button (and pushing the START
button, if the safety module has
been set up with manual START
configuration).
6. TEST & ACTIVATION
The following operations must be
repeated when the module is
installed and every time the wiring
is changed and at regular intervals
by carrying out in sequence all the
steps described below without any
type of dangerous condition for the
operators.
STEP 1Check the integrity, the
correct installation, the correct
positioning on the machine and the
correct functioning of all the
devices connected to the inputs
and to the outputs of the NA13CT
safety module. Check also the cor-
rect wiring of all the devices (See
4.2) and the integrity of the labels
and documentation.
STEP 2Power on the safety mod-
ule with E-STOP button not pushed:
with manual START configuration
the POW ER LED turns on, while
the CH1 and CH2 LEDs are off, the
safety outputs are open and the
auxiary output is closed (in auto-
matic START configuration all the
LEDs are on, the safety outputs
are closed and the auxiliary output
is open).
Close the N.O.START contact: the
safety outputs close, the auxiliary
output opens and the CH1,CH2
LEDs turn on.
STEP 3Push the E-STOP button:
the safety outputs open (after the
delay has expired), the auxiliary
output closes and the POW ER,
CH1,CH2 LEDs turn off (always
when the delay has expired).
Repeat STEP 2 checking that the
safety outputs do not close - with
manual START configuration - sim-
ply releasing the E-STOP device,
without pushing the START button.
Check also that the safety outputs
do not close, that the auxiliary out-
put does not open, and that the
POW ER,CH1,CH2 LEDs are off
simply pushing the START button
with E-STOP button pushed.
If more than one E-STOP is used,
the STEPS 2 and 3 must be
repeated for each device.
7. USAGE PRECAUTIONS
The safety module can check the
integrity of external contactors or
expansion modules simply con-

7
necting their N.C. control contacts
in series to the START contact (or
to the bridge, in automatic START
configuration) between S1-S2 ter-
minals.
It is recommended to connect a
fuse in series to the safety outputs
to reduce the risk of safety outputs
contacts welding (see outputs
technical data).
Never, in any situation, connect
spark quenching unit circuits in
parallel to safety outputs contacts:
the safety function would no longer
be guaranteed.
The safety outputs open with a
delay that is defined within a range
(see technical data): the user must
always consider the worst case
(maximum delay allowed by the
range) in designing his own
machine, in order to avoid the pos-
sibility for the operator to reach
hazardous areas when dangerous
situations are still active.
The NA13CT safety relay can be
employed also with mechanical or
magnetic limit switches or sensors,
if these devices have one/two con-
tacts, closed when there is no dan-
ger for the operator (e.g. gate/door
closed), open when there are dan-
gerous situations fot the operator
(e.g. gate/door open).
Never, in any circumstance,
exceed the electrical ratings stated
in the technical data table of this
manual.
8. INSPECTIONS AND
MAINTENANCE
The integrity of the safety module
and of all the connected devices
must be checked regularly accord-
ing to the risk evaluation of the
machine, under the complete
Fig. 2: NA13CT application with one single-channel E-STOP device

8
responsibility of the user.
Regular inspections must be per-
formed repeating all the operations
listed in the TEST & ACTIVATION
section.
The safety module doesn’t require
internal maintenance: it must be
periodically cleaned - with machine
and module powered off - together
with all the connected devices,
removing dust, liquids and conden-
sation.
9. APPLICATIONS
In Fig. 2 and 3, if the one-channel
(two-channels) E-STOP button is
not pushed, the safety outputs
close (with automatic START) or
are enabled to close (with manual
START). When the E-STOP button
is pushed, the safety module is
switched off: the safety outputs
open and the auxiliary output clos-
es as soon as the releasing delay
has expired.
In Fig. 4 and 5, if both the
onechannel (two-channels) E-
STOP buttons are not pushed, the
safety outputs close (with automat-
ic START) or are enabled to close
(with manual START). When even
one of the E-STOP buttons is
pushed, the safety module is
switched off: the safety outputs
open and the auxiliary output clos-
es as soon as the releasing delay
has expired.
Fig. 3: NA13CT application with one double-channel E-STOP device

9
Fig. 4: NA13CT application with two double-channel E-STOP devices
Fig. 5: NA13CT application with two single-channel E-STOP devices

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10. TECHNICAL DATA
ELECTRICAL CHARACTERISTICS
Supply Voltage 18 Vac -15/+10% 50 ÷60Hz,
24 Vdc -15/+10%
Current Consumption 50 mA (@ 24Vdc, without load)
Power Consumption Max. 2 VA
Input 1 or 2 N.O. Voltage-free
Safety Category (EN 954-1) 3
E-STOP Category (EN 60204-1) 1
Short-Circuit Protection Internal PTC
SAFETY OUTPUTS
Function Force-guided N.O. contacts
Max Switching Voltage AC 250 V
Max. Switching Current 6 A
Max. Switching Power
(Resistive Load) 1500 VA
Output contacts protection External fuse: 4 A
Mechanical Life > 107switching cycles
Electrical Life (with max. load) > 105switching cycles
AUXILIARY OUTPUT
Function Force-guided N.C. contacts
Ratings See Safety Outputs ratings
TIMINGS
Response time (from E-STOP
pushed to safety outputs open):
a) @ 24 Vdc 1.0 ±0.2 seconds
b) Within the supply range 1.0 -0.3/+0.5 seconds
START delay (from START button
pushed to safety outputs closed) Max. 100 ms