2
Operating instructions
Fail-safe standstill monitor
FWS 2105
FWS 2505
EN
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 modiications to the device are strictly
forbidden; the manufacturer shall accept no liability for damages
resulting from such invasive work, arbitrary repairs, conversions
and/or modiications to the device.
2 Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
FWS 2105
➀
No.
Option
Description
➀
Standstill frequencies of the inputs X2/X4:
A
1 Hz/2 Hz
C
1 Hz/1 Hz
FWS 2505
➀
No.
Option
Description
➀
Standstill frequencies of the inputs X2/X4:
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 speciications apply accordingly, provided that they correspond to
the standard version.
2.3 Destination and use
The fail-safe standstill monitors are designed for control cabinet
mounting. Standstill monitors serve for the fail-safe detection of the
machine standstill and control of solenoid interlocks. As soon as the
fail-safe standstill monitor has detected the standstill, the solenoid
interlock is controlled through the potential-free contacts of two safety
relays. For the standstill detection, the signals of two proximity switches
are evaluated. The fail-safe standstill monitors meet the requirements of
PL d or control category 3 to EN ISO 13849-1.
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.
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 structure. It is
provided with two 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).
2.4 Technical data
Standards:
IEC/EN 60204-1, BG-GS-ET-20
Feedback circuit (Y/N):
no
Standstill frequency:
Version A: X1/X2: 1 Hz / 2 Hz
Version C: X1/X2: 1 Hz / 1 Hz
other versions: upon request
Rated operating voltage U
e
:
24 … 230 VAC/DC
Rated operating current I
e
:
max. 0.4 A
Rated insulation voltage U
i
:
250 V
Internal electronic protection (Y/N):
no
Power consumption:
< 5 W
Input monitoring:
Cross-wire detection:
no
Wire breakage detection:
yes
Earth leakage detection:
no
Hysteresis:
10% of the standstill frequency
Max. input frequency:
FWS 2105: 4000 Hz
Min. impulse duration:
FWS 2105: 125 μs
Outputs:
Stop category 0:
FWS 2105: 1
FWS 2505: 4
Stop category 1:
0
Number of safety contacts:
FWS 2105: 1
FWS 2505: 4
Number of auxiliary contacts:
FWS 2105: 0
FWS 2505: 1
Number of signalling outputs:
2
Max. switching capacity of
the safety contacts:
6 A
Max. fuse rating:
4 A gG D-fuse
Required short-circuit current:
1000 A
Utilisation category to
EN 60947-5-1:
AC-15: 230 V / 3 A;
DC-13: 24 V / 2 A
Mechanical life:
FWS 2105:
> 50 million operations
FWS 2505:
20 million operations
LED indication:
ISD
Ambient conditions:
Ambient operating temperature:
0°C…+55°C
Storage and transport temperature: -25°C…+70°C
Protection class:
Enclosure: IP 40,
Terminals: IP 20,
Wiring compartment: IP 54
Degree of pollution:
2
Fixing:
Snaps onto standard DIN rails
to DIN EN 60715
Connection type:
Screw terminals
Min. cable section:
0.2 mm²
Max. cable section:
2.5 mm², solid strand
or multi-strand lead
(incl. conductor ferrules)
Tightening torque:
0.6 Nm
Weight:
FWS 2105: 275 g
FWS 2505: 300 g
Dimensions (H/W/D):
100 x 45 x 121 mm
