6
Operating instructions
Safety light curtain/safety light grid
SLC 420
SLG 420
EN
2.9.4 Floating blanking SLC 420
The SLC 420 can blank movable parts in the protection field
Cylinder for material ejection
The function enables an arbitrary floating blanking of partial areas in the
protection field The first beam, which is located immediately behind
the diagnostic window, cannot be blanked
The SLC 420 can blank one or more beams in the protection field A
combination of fixed and floating blanking is possible
This function allows for an interruption of the protection height without
the outputs being disabled in case of material movement in the
protection field, eg material ejection or process-controlled material
movement In this way, the physical resolution changes into an effective
resolution This effective resolution must be used to calculate the
safety distance Use formula (1) to calculate the safety distance with
the effective resolution if a maximum of 2 light beams are blanked; use
formula (3) indicated in the "Safety distance" chapter if more than 2 light
beams are blanked
The number of beams to be blanked is limited by the software, see
Table Effective resolution
In a system with a physical resolution of 14 mm, the effective resolution
changes to a value of 34 mm with floating blanking of two beams The
effective resolution must be permanently known and well visible on the
information label of the receiver
The muting is configured using the BUS converter
NSR-0801 and a PC / Laptop If the function is activated,
the LED blanking in the diagnostic window of the receiver
starts flashing
Perform a new calculation of the safety distance with the
effective resolution Adjust the safety distance in accordance
with your calculation
The Standard IEC/TS 62046 describes the measures that
may be necessary to protect persons from hazards due to
protected areas that are blanked
2.9.5 Floating blanking SLG 420
The SLG 420 can blank movable objects in the protection field.
4
3
2
1
R1
E1
The function of floating blanking is allowed for only one beam taking
into consideration the protective function This function can be used for
temporary beam suppression due to environmental conditions
The first beam line, which realises the optical synchronisation and is
located immediately behind the diagnostic window, cannot be blanked
The function is activated by means of the NSR-0801 BUS
converter and a PC or laptop If the function is activated,
the LED blanking in the diagnostic window of the receiver
starts flashing
• The blanking of beams is not available for an SLG 420
with 2 beams!
• The blanking of one beam at the most in the SLG 420
3-beam version or the SLG 420 4-beam version is available,
provided that the protective function is taken into account
• The restart interlock (manual reset) function of the safety
light grid 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
2.9.6 Contactor control (EDM)
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, eg contact welding or contact spring breakage If the
light curtain detects a malfunctioning of the switching elements, the
outputs are locked, ie after elimination of the failure, a Power Reset is
required
The auxiliary contacts must only be connected, when the
function is activated!
After the solving of a fault, a system start must be
performed (voltage reset)
The contactor control is not activated upon delivery This
function is activated by means of the NSR-0801 BUS
converter and a PC or laptop
Activation of the contactor control (EDM) without software
The contactor control can be activated without PC software as of
firmware version 123, by means of cable bridges (refer to chapter
Parameterisation of the Contactor Control without PC software)