Stem NC86 User manual

! !
Y2
Signal
Output
Supply
24 V ac/dc
A1 A2 Y1
Ka
Start
button
(reset)
Feedback loop of the
external contactor
(bridged if not used)
NM
3
K1
23X1S33S34
K1
X2 13 14
L3L1L2
24
Main inputs
S22S21
K2
K3
K2
S11S12
K3K3
Safety
outputs
Kb
L
Operating instructions for safety control unit mod. NC86 - original instructions -
Description
The NC86 safety relay is created for use in safety circuit intended by
EN 81-20, EN 81-50, EN 60204-1, EN ISO 13849-1.
This module is based upon the use of guided-contact safety relays.
Safety Precautions
The manufacturer or the technician that install the machinery is responsible for
correct and safe overall function.
Auxiliary output Y1/Y2 is optoinsulated and gives informations about the state of the
device; it must not be used as a safety output.
The NC86 is not proper for the operation in presence of ionizing and not ionizing
radiations (rays X, microwaves, laser, ultraviolet rays)
(EN 60204-1:2018, §4.4.7).
Functioning
The NC86 Module can control the state of two contacts (Reed sensors,
emergency stop button, mechanical safety switches, interlocks for mobile guards):
the output is activated by pressing the START button only if the contacts of two
sensors are closed. The opening of even only one input contact (S1 and/or S2),
leads to a safety situation, by putting the safety outputs in open state and by
preventing the closing even after the re-closing of the contact and the pressure of the
START button.
WARNING: the start command does not fulfill the requirements of §5.2.2 of
EN ISO 13849:2015 standard because it works on the rising edge of the signal.
If the NC86 is used to control emergency stop button, after the intervention of the
device, the reset of the command shall not restart the machinery but only permit
restarting
(EN 60204-1:2018, §9.2.3.4.2, EN ISO 13850:2015, §4.1.4).
If the NC86 is used to control interlocks for mobile guards, the reclosing or
resetting of an interlock safeguard shall not initiate hazardous machine operation
(EN 60204-1:2006, §9.3.1).
If START button is not used (automatic rearmament), see the connection diagram in
the following page; the behavior of the machinery to the restart of the device - or the
not automatic restart of the dangerous elements of the machinery - depends on the
realization of the command circuit of the machinery according to the risk evaluation
effected by the user.
Input channels work on opposite potentials (S11,S31 →- ; S21,S41 → +).
It's available an input (X1-X2) for feedback with contactors or external relays
(see Ka and Kb on the connection diagram); if not used, X1-X2 have to be bridged.
Safety category 4 is granted only if (see connection diagram):
-to interrupt the load are used two relays, each connected to an input of the
safety unit;
-the contacts of the relays controlled by the safety unit are inserted into the
feedback loop.
The safety is ensured by using guided contacts, by the redundance and by the
interconnection schematic of the contacts.
The responsibility to choose the adequate components for safety applications, for
example guided contacts safety relays, falls to the user.
Assembly
Installation must be performed by authorized personnel only.
The NC86 control unit must be assembled in a suitable operating area
(switch cabinet, protective housing).
The unit is installed by clipping it to a standard 35 mm top-hat rail.
Electrical Connection
Electrical connection must be performed by authorized personnel only following the
indications of EN ISO 13849-1 and EN ISO 13849-2.
All the electrical inputs must either be isolated from the mains supply by a separate
coils safety transformer in accordance with EN IEC 61558-2-6 with limited output
voltage in the event of a defect or by another equivalent movable mechanism.
The outputs of the relays have a maximum current of 3 A; the supply connected to
the outputs must be protected from overcurrents by devices adequate to the loads
that have to be protected. All the output contacts must have an adequate protective
circuit for capacitive and inductive loads.
If a common power supply is used, all the inductive and capacitive loads (e.g. relay
contactors) connected to the power supply must be connected to appropriate
interference suppressors.
Service and Inspection
The correct functioning of the NC86 safety unit must be controlled by the operator
and/or by the control circuit of the machine in which it is used periodically (at the
beginning of every shift), by checking:
- Correct switching function of each sensor by checking:
a) that the opening of the single sensor / safety guard will cause the opening of the
safety outputs (13-14 / 23-24)
b) that the closure of the same sensor / safety guard will cause the closing of the
safety outputs (13-14 / 23-24) as a result of a startup command
- secure mounting of components
- correct connection fixing.
The monitoring function of the unit is done at every switching cycle.
If with all safety guards closed and following the eventual start command, the safety
device does not activate its safety outputs, do not turn off and turn on the device ,
then proceed to the checking of the possible safety guard open and perform the
above tests in point a) and b). In the event of damage or wear and tear, the
damaged system component must be replaced.
Liability coverage is void under the following circumstances:
- if instructions are not followed
- non-compliance with safety regulations
- installation and electrical connection not performed by authorized personnel
- non-implementation of functional checks.
Setup
If the control unit does not appear to function when operating voltage is applied
(PWR LED does not light up), the unit must be returned unopened to the
manufacturer.
Check whether the safety outputs are being switched (see LED display) by
activating the two inputs S1, S2 and START.
Operation according to EN 81-20:2014
The safety module ensures the opening of contacts within 15 ms from the opening
of the sensors S1 or S2.
It can be used as a detector, according to 5.6.7.7 EN 81-20:2014,to be integrated in
a A3 system.
Connections
-
+
1) Lift applications
(EN 81-20, EN 81-50:2014):
Reed contact sensors S1 e S2
S11S22S21 S12
S2 S1
2) Machine safety applications
(cat.4 EN ISO 13849-1):
sensor (S1) with 2 normally open
(N.O.) contacts
S11S22S21 S12
S1
3) Mobile guard interlock sensors
with normally closed (N.C. contacts)
(EN ISO 14119;
cat.4 EN ISO 13849-1;
EN 60204-1:2018, §9.3)
S11S22S21 S12
S2 S1
4) Emergency stop button in
accordance with EN ISO13850
(stop category 0, EN ISO 13850)
with 2 N.C. contacts (S1)
(cat 4 EN ISO 13849-1)
S21
S1
S12S22 S11
5) Emergency stop button with 1 N.C. contacts (S1) in accordance with
EN ISO13850 (stop category 0, EN ISO 13850;
EN 60204-1:2018, §9.2.3.4; cat 4 EN ISO 13849-1 if one or no*
sensor is connected to the unit)
S21
S1
S12S22 S11
*Short the inputs if not used for
2 NO contacts sensor
Alimentazione
24 V ac/dc
A1 A2
L1 +
L2 -
-
+ -
+
-
+ -
+
Automatic start connections
-1- Automatic start ONLY FOR use as lift safety unit
(EN 81-20, EN 81-50)
Reed switch sensors ID, IS and IZ.
In this configuration the inputs synchronization time among the closing
of IZ and one between IS and ID, it is endless, but a correct closing
sequence has to be respected: the first contact to be closed is IZ, then
IS or ID.
-2- Short-circuit of S33 and S34; in this case there will be a
synchronism time between inputs of 600 ms. S33S34
S12S11 S22S21 S33S34
GND + +
NOT CONNECTED
IZ
IS ID
Feedback loop of the
external contactor
(short-circuit if not used)
MD
N.O.
N.O.
MZ
N.O.
MS
ID
IZ
IS
Subject to technical modifications without notice, no liability will be assumed for any detail. © STEM S.r.l. 1SMA NC86 0000 rev.18_03/2022

Operating instructions for safety control unit mod. NC86 - original instructions -
S1, S2
START
Power
S1, S2
START
LED DISPLAYS
Inputs S1, S2, START: CLOSE
Inputs S1, S2, START: OPEN
Outputs 13/14, 23/24 and Y1/Y2: CLOSE
Outputs 13/14, 23/24 and Y1/Y2: OPEN
Function
Supply Voltage
on
off
on
green
green
-
OUT
off
State
on
Color
(ON)
-
green
OUT
LED
Dimensions
S21
A1
S11S22 S12
Y2Y1A2
S33
13 23
X2X1S34
START
PWR
NC86
OUT
STEM
S2
S1
14 24
STEM S.r.l.
via della Meccanica, 2
I-27010 Cura Carpignano
Pavia Italia
Tel. [phone] Fax [phone]
www.stemsrl.it st[email protected]t
600
13-14 e 23-24 (normally open)
PA 6.6
DC: OUT=off: 50 OUT=on: 100; AC: OUT=off: 50 OUT=on: 100
in accordance with EN 81-50,EN 60947-5-3
0,15 (MAX)
60 (MAX)
55 (MAX)
Y1-Y2 (collector-emitter optoinsulated)
750
10
2,5 x 10 (250 Vac, 3 A cosφ=1)
5
7
250
1
24 +15%, - 15% (AC 50 ÷ 60 Hz)
Technical data
Parameter
115 x 105 x 22,5 / 180
IP20
3
Value
W
mA
Vdc
VA
V AC
V ac/dc
Hz
mA
ms
ms
mm / g
Unit
Usage category: safety outputs parameters AC-1: 3A @ 250V; AC-15: 0,9A @ 250V
DC-13: 1,8A @ 24V / 0,13A @ 120V / 0,06A @ 240V
0 according to EN 60204-1 e la EN ISO 13850
kPa
°C
kPa
°C
EN 81-20,EN 81-50,EN 60204-1, EN ISO 13849-1,
EN ISO 14119, EN ISO 13850
cycles
cycles
15
Input cables maximum length (lmax)
lmax= Rlmax / (Rl/ km)
Rlmax = total max resistance of the input cables
Rl/ km= cable resistance / km
km
Safety outputs minimum load 10 mA / 5V
Current (A)
Lifetime
(cycles@ Im ax)
Voltage (V)
MIN
AC-1
5
0,01
DC-13AC-15
MAX
250
3
MIN
5
0,01
MAX
250
0,9
MAX
240
0,06
MIN
5
0,01
2,5x10 3x107x10
54 6
Usage category paremeters
3 (MAX) A
Connection type
Supply voltage
Degree of contamination
Degree of protection (IEC 60529)
Housing conditions
Operating conditions
Current consuption
Housing Material
Dimensions / Weight
Assembly
Internal fuse on the supply
Max. switching frequency
OFF state response time (t2)
Input synch. time ts (automatic start -2-)
Safety Output switching voltage
Safety output switching current
Safety output switching power
Safety outputs terminals
Auxiliary outputs terminals
Auxiliary Output voltage
Auxiliary output current
Auxiliary output power
Mechanical operation life
Stop Category
Safety Category and PL
(EN ISO 13849-1)
Approvals
EMC compliance
Vibration resistance
Electrical operation life
In accordance with
TÜV IT 0948 10 MAC 0015 B, TÜV EDES 004
Pressure: 86 ... 106
Relative humidity: 5% ... 95%
Temperature: -25 ... +70
Pressure: 86 ... 106
Relative humidity: 4% ... 100%
Temperature: 0 ... +55
DIN standard 35 mm guide
Screw terminals
750 mA resettable PTC
13-14 / 23-24
S1
S2
Timing diagram for manual start
START
S1
S2
13-14 / 23-24
Timing diagram automatic start - 2 -
(S33-S34 bridged)
t1
t2
IZ
IS o ID
13-14 / 23-24
t1 t2
ts ts ts ts
Timing diagram automatic start - 1 -
(ONLY for lift applications)
EN 61000-6-2, EN 61000-6-3, EN 60947-5-3,
IEC 61326-3-1, EN 12015, EN 12016
Cat. 4
PL - e
nop (numero operazioni / anno)
N°
cycles/
year
61320 17520
years
years
MTTFd
TM
PFHd
20
30
2,47x10- 8
100
9,54x10- 8
Output response time (t1) Typical 120, max 160 ms
Subject to technical modifications without notice, no liability will be assumed for any detail. © STEM S.r.l. 1SMA NC86 0000 rev.18_03/2022
Overvoltage Category