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2.
Description and operation
2.1.
Overview
This chapter contains terms and concepts related to safety and the application of the FF-LS Series miniature safety light
curtain. The importance of the installer's role in the set-up and installation of the machine guarding systems is discussed.
This section also contains device identification and specification information.
2.2.
Description
2.2.1.
Control and sensing unit
The FF-LS Series safety light curtain is an infrared multi-beam device designed to protect operators working on
dangerous machines. Entering the invisible sensing field causes the light curtain output contacts to open. An emergency
stop condition is then sent to the machine control circuitry. Detection of the operator body parts will lead to the
immediate stoppage of the moving parts of the machine.
The FF-LS Series device consists of a control unit connected to a pair of sensing units. Each sensing unit is made up
of a row of emitting circuits alternating with receiving circuits. These circuits are contained in an extremely small
aluminum housing. The 30 mm (1.18 in) resolution device has a housing cross section of 12 mm x 19,7 mm (0.47 in x 0.78 in); the
14 mm (0.55 in) resolution has a cross section of 35 mm x 23 mm (1.38 in x 0.91 in).
The control unit supplies power to the sensing units, monitors correct system operation and transmits the stop signal to the
machine control circuitry via its two output relays.
The light curtain may be operated in one of two different modes. In the automatic mode, the device restarts
automatically after powering up or after any intrusion into the sensing field. In the start/restart interlock mode (manual),
the operator must press an external push-button connected to the terminal strip of the control unit to restart the light
curtain. The mode of operation is selected via an internal selector switch located in the control unit.
The control unit has a test input that is used to trigger the output relay switching and check the correct operation of the final
switching devices. For troubleshooting, the control unit provides optical and acoustic signals to help perform diagnostics.
Permanent self-checking is based on microprocessor technology and meets the requirements of EN 61496 (replaces pr EN
50 100) - part 1 & 2 European standards for type 4 electrosensitive protective equipment. This technique has been
examined by TÜV of Hannover who granted the EC-type examination certificate.
The FF-LS Series safety light curtains are ideal for the protection of workstations on small machines such as paper-cutting
machines or pick-and-place robots.
2.2.2.
Unit compatibility
INCOMPATIBILITY OF FF-LS SERIES SAFETY LIGHT CURTAIN UNITS
The control unit and the sensing units (A and B) are delivered as a set and are preset (same number of beams). Each of the
units in a set has a red label on its housing with the same number that specifies the number of beams in the sensing field.
Ensure the number on the red label is the same for each of the three units in a set.
Ensure the serial numbers on the sensing units A and B are the same.
Failure to comply with these instructions could result in death or serious injury.
The two sensing units A/B are matched to each other by individual coding. Therefore, only connect a matched pair of
sensing units A/B (each has the same serial number) to a control unit. Failure to comply with these instructions will result in
improper product performance.
107022-16 EN FR26 GLO 301 Printed in Germany
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