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In order to start a muting sequence, the muting sensors SM1 and SM2 must be activated within a time frame of maximum 10 s.
The muting sequence is stopped after de-activating the first of the two muting sensors SM1 or SM2.
In any case, the muting sequence will be interrupted after the maximum selected muting time has elapsed. If an object remains
accidentally in the detection field of the safety device, an external temporary manual muting (customer supplied) may be used to
evacuate the detection field (see chapter "Temporary Manual Muting").
APPLICATION EXAMPLE 2: UNI-DIRECTIONAL MUTING WITH 1 MUTABLE SAFETY DEVICE AND 4 MUTING SENSORS
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Conveyor
Conveyor
Mechanical fences
L
A
B
C
L
D
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 muting sensors SM1 – SM2
A < Vmin x 10 s
Distance B muting sensors SM2 – EM1
B < Vmin x Tmaxmuting – Lmax
Distance C muting sensors EM1 – EM2
No direct constraints, but EM2 needs to be located so that all
sensors SM and EM are free before the following conveyor
starts a new valid muting sequence activating SM1 and SM2
Distance D between 2 following conveyors
D > A + B + C + Lmax
For safety related sensor positioning information, refer to the Application Warnings.
Application description
A conveyor is loading and unloading a hazardous zone protected by one mutable safety device (e.g. FF-SYA safety light
curtain). As the conveyor enters and exits the zone at two different points, the movement is uni-directional.
The muting system is composed of the following elements:
• the FF-SRM200P2 muting module,
• 1 mutable safety device (e.g. FF-SYA safety light curtain ) detecting access through the opening for the conveyor,
• 2 start muting sensors SM1, SM2 and 2 end muting sensors EM1, EM2 (e.g. limit switches, proximity sensors, through scan
or retro-reflective-polarised photoelectric sensors).
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107111-11-EN FR26 GLO 503 Printed in Germany
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