2
Operating instructions
Fail-safe standstill monitor
EN
FWS 1206
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages resulting
from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary
repairs, conversions and modifications to the device are strictly for-
bidden; the manufacturer shall accept no liability for damages resulting
from such invasive work, arbitrary repairs, conversions and/or
modifications to the device.
2 Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
FWS 1206
➀
No.
Option
Description
➀
Standstill frequencies of the inputs X1/X2:
A
1 Hz/2 Hz
C
1 Hz/1 Hz
Only if the information described in this operating instructions
manual are realised correctly, the safety function and therefore
the compliance with the Machinery Directive is maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Destination and use
The fail-safe standstill monitor is designed for control cabinet mounting.
Standstill monitors serve for the fail-safe detection of the machine
standstill and control of solenoid interlocks. For the standstill detection,
the signals of one or two proximity switches and an additional standstill
signal are evaluated.
The additional standstill signal can be derived from an already available
standstill signal of the machine, e.g. evaluation of a tachogenerator by
a PLC or the standstill output of a frequency converter.
It is recommended to install the proximity switches on a disc cam
so that at least one proximity switch is always actuated. This can be
realised by a minimum 1:1 division of the disc cam. When the proximity
switches are correctly installed, the following exemplary signal sequence
should be obtained by the utilisation of the switching hysteresis of the
proximity switches during the rotation of the disc cam.
Proximity switch 1:
Proximity switch 2:
The adjustment of the proximity switches is facilitated, when the cam
has a 2:1 division (or higher).
Design
The fail-safe standstill monitor has a dual-channel redundant structure.
It is provided with two safety relays with monitored, positive-guided
contacts which are controlled by two independent microprocessors. The
NO contacts of the series-wired relays build the enabling paths.
The feed cables of both proximity switches (power supply) must be laid
so that in case of a wire breakage only one proximity switch is dead
(star-shaped routing).
To determine the Performance Level (PL) to EN ISO 13849-1
of the entire safety function (e.g. sensor, logic, actuator), an
assessment of all relevant components is required.
2.4 Technical data
Standards:
EN 60204-1, EN ISO 13849-1,
IEC 61508, BG-GS-ET-20
Enclosure:
glass-fibre reinforced thermo-
plastic, ventilated
Feedback circuit (Y/N):
yes
Standstill frequency:
Version A: X1/X2: 1 Hz / 2 Hz
Version C: X1/X2: 1 Hz / 1 Hz
Rated operating voltage U
e
:
24 VDC ± 15%
Rated operating current I
e
:
0.2 A
Internal electronic protection (Y/N):
no
Power consumption:
< 5 W
Input monitoring:
1- or 2-channel,
p-type impulse generator
Cross-wire detection:
no
Wire breakage detection:
yes
Earth leakage detection:
yes
Hysteresis:
10% of the standstill frequency
Max. input frequency:
4000 Hz
Min. impulse duration:
125 μs
Input resistance:
approx. 4 kΩ to GND
Input signal "1“:
10 ... 30 VDC
Input signal "0“:
0 ... 2 VDC
Max. cable length:
100 m with 0.75 mm2 cable
Outputs:
Stop category 0:
2
Stop category 1:
0
Number of safety contacts:
2
Number of auxiliary contacts:
0
Number of signalling outputs:
2
Signalling output:
2 semi-conductor outputs,
Y1 + Y2 = max. 100 mA,
short-circuit proof, p-type
Max. switching capacity of
the safety contacts:
6 A
Utilisation category to
EN 60947-5-1:
AC-15: 230 V / 3 A;
DC-13: 24 V / 2 A
Rated insulation voltage U
i
:
250 V
Rated impulse withstand
voltage U
imp
:
4 kV
Thermal test current I
the
:
6 A
Contact load capacity:
max. 250 VAC, max. 6 A (cos φ=1)
Max. fuse rating:
6 A gG D-fuse
Mechanical life:
20 million operations
LED indication:
Wiring diagram
Ambient conditions:
EMC rating:
conforming to EMC Directive
Overvoltage category:
III to DIN VDE 0110
Degree of pollution:
2 to DIN VDE 0110
Resistance to vibrations:
10 ... 55 Hz / amplitude 0.35 mm
Resistance to shock:
30 g / 11 ms
Ambient operating temperature:
0°C…+55°C
Storage and transport temperature: -25°C…+70°C
Protection class:
Enclosure: IP 40,
Terminals: IP 20,
Clearance: IP 54
Fixing:
Snaps onto standard DIN rails
to DIN EN 60715
Connection type:
Screw terminals
Min. cable section:
0.2 mm
2
Max. cable section:
2.5 mm
2
, solid strand
or multi-strand lead
(incl. conductor ferrules)
Weight:
190 g
Dimensions (H/W/D):
100 x 22.5 x 121 mm
