Stem NC85 User manual

Operating instructions for safety control unit mod. NC85 - Original instructions -
!
Description
The NC85 safety relay is created for use in safety circuit intended by
EN 81-20, EN 81-50, EN 60204-1, EN ISO 13849-1, EN 61496-1.
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 NC85 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).
The NC85 CANNOT be disposed as generic waste.
Functioning
The NC85 Module can control the state of two contacts (Reed or Hall effect sensors,
emergency stop button, mechanical safety switches, interlocks for mobile guards, safety light
curtains): the output is activated by pressing the START button only if the contacts of two
sensors are closed. The opening of 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
NC85 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 NC85 is used to control
interlocks for mobile guards, the reclosing or resetting of an interlock safeguard shall not
initiate hazardous machine operation (EN 60204-1:2018, §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 NC85 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 IEC EN 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 connectedto 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 NC85 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 (green LED PWR 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.
1) Lift applications (EN81-20,EN81-50):
Reed contact sensors S1 e S2
2) Lift applications
(EN81-20, EN81-50):
NPN static output devices S1 and S2
3) Lift applications
(EN81-20,EN81-50):
PNP static output devices S1 and S2
4) Machine safety applications
(cat.4 EN ISO 13849-1:2015):
sensor (S1) with 2 normally open
(N.O.) contacts
5) Mobile guard interlock sensors with
normally closed (N.C.) contacts
(EN 14119;
cat.4 EN ISO 13849-1;
EN 60204-1:2018, §9.3)
6) Control of an emergency stop button in accordance with EN ISO 13850
(stop category 0, EN ISO 13850;
EN 60204:2018, §9.2.3.4)
LED Table
Inputs S1, S2, START: OPEN S1, S2, START
Power
LED
OUT
OUT
on
State
on
off
off-
green
green
-
Color
(ON)
Inputs S1, S2, START: CLOSED on
green
S1, S2, START
7) Safety light curtains:
2 static outputs NPN or PNP
(Tipo 4, EN 61496-1)
2 N.O. outputs (B1)
(Tipo 4, EN 61496-1)
Bridge the inputs if not
used for 2 NO contacts
sensor
Power supply
24 V ac/dc
with 2 N.C. contacts (S1) (cat 4 EN ISO 13849-1)
with 1 N.C. contact (S2)
(cat 4 EN ISO 13849-1)
Inputs
S21
B2
S12S22 S11
Bridge the inputs if not
used for 2 NO contacts
sensor
Power supply
24 V ac/dc
A1 A2
L1 +
L2 -
1 N.O. output (B2)
(Tipo 2, EN 61496-1)
+-
Outputs 13/14, 23/24 and Y1/Y2: CLOSED
Outputs 13/14, 23/24 and Y1/Y2: OPEN
Function
Supply Voltage
Subject to technical modifications without notice, no liability will be assumed for any detail. © STEM S.r.l. 1SMA NC85 0000 rev.18_03/22
S11S22S21 S12
S2 S1
S31S11S22S21 S41S12 S42 S32
+signal +signal
S1 S2
__
S22
+
S21
signal _+
S11 S41S12 S42
signal
S31S32
S2S1
_
+-
S11S22S21 S12
S1
S11S22S21 S12
S2 S1
+-
+-
S21
S1
S12S22 S11
+-
S21
S2
S12S22 S11A1 A2
L1 +
L2 -
+-
S12S32 S22S42
NPN
+24Vdc
PNP
S11S22S21 S12
B1
+-

Connections
Operating instructions for safety control unit mod. NC85 - Original instructions -
STEM S.r.l.
via della Meccanica, 2
I-27010 Cura Carpignano
Pavia Italia
Tel. [phone] Fax [phone]
www.stemsrl.it [e-mail]
Dimensions
S21 S41
A1
S11S22 S12
S32S31S42
Y2Y1A2
S33
13 23
X2X1S34
START
PWR
NC85
OUT
STEM
S2 S1
14 24
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 60204-1and 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,
EN 61496-1
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@ Imax)
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
Automatic start connections
-1- Automatic start ONLY FOR for use as lift safety unit
(EN81-20, EN81-50)
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.
This configuration cannot be used
with Hall effect sensors.
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
-2- Short-circuit of S33 and S34; in this case there will be a
synchronism time (ts) between inputs of 600 ms.
3 (MAX) A
S33S34
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
T
Ü
V IT 0948 10 MAC 0010 B, T
Ü
V EDES 003
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
Y2
Signal
Output
Supply
24 V ac/dc
A1 A2 Y1
Ka
Start
button
(reset) Feedback
loop of the
external
contactor
(short-circuit if
not used)
NM
3
K1
23X1S33S34
K1
X2 13 14
L3L1L2
24
Main inputs
S22S21
Auxiliary inputs for
static output PNP
or NPN devices
K2
K3
K2
S42S41S11S12 S31S32
K3K3
Safety
outputs
Kb
L
+_+_
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, EN 61496-1
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
Overvoltage Category III
Subject to technical modifications without notice, no liability will be assumed for any detail. © STEM S.r.l. 1SMA NC85 0000 rev.18_03/22