3
FWS 2105
FWS 2505
Operating instructions
Fail-safe standstill monitor
EN
2.5
Safety classiication
Standards:
EN ISO 13849-1; IEC 61508
PL:
up to d
Control category:
up to 3
PFH value:
1.0 x 10
-7
/ h; applicable for
applications with up to max.
50,000 switching cycles / year and
max. 80 % contact load. Diverging
applications upon request.
SIL:
up to 2
Service life:
20 years
3 Mounting
3.1 General mounting instructions
Mounting: snaps onto standard DIN rails to EN 60715.
3.2 Dimensions
Device dimensions (H/W/D): 100 x 45 x 121 mm
4 Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
Wiring examples: see appendix
5 Operating principle and settings
Operating principle after the operating voltage is switched on
After the operating voltage has been applied, the internal functions and
the condition of the safety relays will be tested by the fail-safe standstill
monitor during the initialization phase. After this check, the inputs of the
fail-safe standstill monitor will be evaluated.
The cyclic frequency of the connected proximity switches is compared
to a programmed limit frequency. If the value drops below the pro
-
grammed frequency and at least one proximity switch is actuated,
both safety relays are actuated and the enabling paths are closed.
If the limit frequency is exceeded at one or both cyclic inputs or if both
proximity switches are not actuated, the safety relays are disabled.
If the programmed upper or lower limit frequency is exceeded, the
frequencies of both proximity switches are compared. A divergence of
over 30% will be considered faulty and signalled (refer to ISD table).
Inputs
X1: connection for proximity switch 1 (24 VDC)
X2: connection for proximity switch 1 (cyclic input)
X3: connection for proximity switch 2 (24 VDC)
X4: connection for proximity switch 2 (cyclic input)
or bridge to X2
X5: connection for reset button (24 VDC)
X6: connection for reset button
X8: connection for an additional standstill signal
"high": standstill
"low": motor runs
Outputs
FWS 2105: (13/14) NO contact for safety functions (enabling path)
FWS 2505: (13/14)-(23/24)-(33/34)-(43/44) NO contacts for safety
functions (enabling paths)
(51/52) NC contact for signalling purposes
Additional transistor outputs Y1/Y2
Y1: "Enabling signal"; the enabling paths are closed
Y2: "Fault"; if the fail-safe standstill monitor detects a fault,
Y2 is enabled.
Reset input
A high signal at X6 deletes all detected faults of the fail-safe standstill
monitor and causes the safety relays to be switched off.
Note
The additional outputs Y1 and Y2 must not be integrated in the safety
circuit. 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). According to EN ISO 13849-1, control
category 2, an individual fault must not lead to a loss of safety.
6 Set-up and maintenance
6.1 Functional testing
The safety function of the safety-monitoring module must be tested.
The following conditions must be previously checked and met:
1. Proper itting of the safety-monitoring module
2. Fitting and integrity of the power cable
6.2 Maintenance
In the case of correct installation and adequate use, the safety-
monitoring module features maintenance-free functionality.
A regular visual inspection and functional test, including the following
steps, is recommended:
• Check the correct ixing of the safety monitoring module
• Check the cable for damage.
Damaged or defective components must be replaced.
7 Disassembly and disposal
7.1 Disassembly
The safety monitoring module must be disassembled in the
de-energised condition only.
7.2 Disposal
The safety monitoring module must be disposed of in an appropriate
manner in accordance with the national prescriptions and legislations.
