4
Operating instructions
Safety light curtain / safety light grid
SLC 220
SLG 220
EN
2.8 Functions
The system consists of a receiver and a transmitter. For the described
functions, no further switching elements are required. For the diagnos-
tics and function selection, a user-friendly PC-software is offered as
accessory. For the connection to a PC, the NSR-0700 BUS converter is
required (not included in delivery).
The system has the following features:
- Protective mode (automatic start after release of the protected field)
- Start interlock
- Restart interlock (manual reset)
- Contactor control (EDM)
- Blanking of fixed protection field areas
- Cascading
Factory setting
The SLC/SLG 220 system features many functions without additional
devices. The following table gives an overview of the possible functions
and the factory settings configuration.
Function
Factory setting Configuration
Protective mode
not active
External wiring
Restart interlock
(manual reset)
active
External wiring
Fixed blanking
not active
With BUS converter
NSR-0700 and PC-software
Contactor control
not active
With BUS converter
NSR-0700 and PC-software
Start interlock
not active
With BUS converter
NSR-0700 and PC-software
Switch-on delay
not active
With BUS converter
NSR-0700 and PC-software
2.8.1 Protective mode
The protective mode switches the OSSD outputs to ON state (protec-
tion field not interrupted), without external release of a switching device.
This type of protection generates an automatic restart of the machine if
the protection field is not interrupted.
This operating mode may only be chosen in conjunction with the
restart interlock of the machine. This operating mode must not be
chosen, when persons can step behind the protection field.
2.8.2 Restart interlock (manual reset)
The restart interlock prevents an automatic enabling of the outputs
(OSSD's ON state) after switch-on of the operating voltage or an inter-
ruption of the protection field.
Restart interlock active (factory setting)
The SLC/SLB 220 series only switches to the ON state, when a com-
mand device is connected to the restart interlock input. To enable the
outputs, the command device must be actuated no longer than 2.5
seconds.
Deactivating the restart interlock (manual reset)
Wire the restart interlock input (PIN 1) of the transmitter to the signal
quality output (PIN 1) of the receiver.
The command devices (enabling button) must be installed outside
of the hazardous area. The operator must have a clear view on
the hazardous area when actuating the enabling button.
2.8.3 Fixed blanking
The SLC 220 can blank stationary parts in the protection field.
Multiple protection field areas can be blanked.
Fixed blanking area
E1
R1
The range of the fixed blanking can be arbitrarily chosen in the protec-
tion field. Multiple areas can be blanked. At least one light beam must
be active in the protection field.
The area of the fixed blanking must not be modified after
the teach-in process. Any change of the area or removal of
the part from the protection field will result in the absence of
monitoring in certain areas of the protection field. After every
shifting (part(s) in the protection field), a new teach-in proc-
ess must be executed.
The standard IEC/TS 62046 includes information, which describes
possibly required additional measures to prevent a person from
reaching a hazard through the blanking areas of a protection field.
• The remaining lateral areas must be protected against intru-
sion by means of mechanical covers.
• The lateral covers must be fixed with the object. Partial cov-
ers are not authorised.
• After the fixed blanking, the protection field must be tested
by means of the test rod.
• The restart interlock function of the safety light curtain or the
machine must be activated.
• The standard IEC/TS 62046 includes information, which
describes possibly required additional measures to prevent
a person from reaching a hazard through the blanking areas
of a protection field.
• After configuration, the protection field must be checked by
a responsible person by means of a test rod; in addition to
that, this person must compare the size of the blanked area
to the object size and if necessary provide for additional
covers or a larger distance of the safety guard with regard to
the hazardous point.
The function is activated by means of the NSR-0700 BUS
converter and a PC or laptop. The activation of the function
is signaled by the LED blanking flashing in the diagnostic
window of the transmitter.
The light beams of the SLG 220 series cannot be blanked.
2.8.4 Contactor control EDM (feedback)
The contactor control monitors the controlled switching elements
(auxiliary contacts of the contactors) of both outputs. This monitoring
is realised after each interruption of the protection field and prior to the
restart (enabling) of the outputs. In this way, malfunctions of the relays
are detected, e.g. contact welding or contact spring breakage. If the
light curtain detects a malfunction of the switching elements, the outputs
are locked. After fault rectification, the operating voltage must be once
switched off and back on (power reset).
The contactor control is not activated upon delivery. This
function is activated by means of the NSR-0700 BUS con-
verter and a PC or laptop.