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107111-11-EN FR26 GLO 503 Printed in Germany
9
APPLICATION EXAMPLE 1: BI-DIRECTIONAL MUTING ON A CONVEYOR
1A - Bi-directional muting with 2 muting sensors,
1 mutable and 1 non-mutable safety device
FF-SB
(receiver)
SM1
SM
2
!
Mechanical fences
Conveyor
L
A
B
Conveyor
FF-SB
(emitter)
GK
safety switch
door
C
C
L
A
1B - Bi-directional muting with 2 pairs of muting sensors,
1 mutable and 1 non-mutable safety device
Conveyor
FF-SB
(receiver)
SM1a
!
Mechanical fences
Conveyor
SM2a
SM2b
FF-SB
(emitter)
GK
safety switch
door
SM1b
L
A
B
C
C
L
A
Sensor positioning
Vmax = (maximum) conveyor speed
Vmin = (minimum) conveyor speed
Tmaxmuting = maximum muting time (selected with program selector B)
Lmin = (minimum) length of conveyor (e.g. palette)
Lmax = (maximum) length of conveyor (e.g. palette)
Distance A crossing points
Q
-
R
and
S
-
T
Distance A muting sensors SM1a – SM2a and SM1b –SM2b
A < Vmin x 10 s
Distance B crossing points
R
-
T
Distance B muting sensors SM2a – SM2b
B < Vmin x Tmaxmuting – Lmax
Distance C between 2 following conveyors
C > 2 x A + B + Lmax
For safety related sensor positioning information, refer to the Application Warnings.
Application description
A conveyor is loading and unloading a hazardous zone guarded by two safety devices (e.g. FF-SB safety light curtain, GK
safety key interlock switch). As the conveyor enters and exits the zone passing through the same opening, the movement is
bi-directional.
The muting system is composed of the following elements:
•
the FF-SRM200P2 muting module,
•
1 mutable safety device (e.g. FF-SB safety light curtain) detecting access through the opening for the conveyor,
•
1 non-mutable safety device (e.g. GK safety key interlock) to monitor the safety door ("guard only"),
•
example 1A: 2 auxiliary muting sensors SM1 and SM2 to start and end the muting sequence (crossed through scan or retro-
reflective-polarised photoelectric sensors),
•
example 1B: 2 pairs of muting sensors SM1a, SM2a, SM1b and SM2b to start and end the muting sequence (e.g. limit
switches, proximity sensors, through scan or retro-reflective-polarised photoelectric sensors).
The use of the second mutable or non-mutable safety device connectable to the same FF-SRM200P2 module is optional.
F
S
RM
200_12
F
S
RM
200_13