Programmable Safety Controller SCR P
www.bernstein.eu
- Tel: + 49 571 793 0
31
C
the added distance due to the depth penetration factor equals 1200 mm, per EN 13855
Safety Mat Hookup Options
Pressure-sensitive mats and pressure-sensitive floors must meet the requirements of the category for which they are
specified and marked. These categories are defined in ISO 13849-1.
The safety mat, its Safety Controller, and any output signal switching devices must meet, at a minimum, the Category 1
safety requirements. See ISO 13856-1 (EN 1760-1) and ISO 13849-1 for relevant requirement details.
The Safety Controller is designed to monitor 4-wire safety mats and is not compatible with two-wire devices
(mats,
sensing edges, or any other devices with two wires and a sensing resistor).
This circuit typically meets ISO 13849-1 Category 2 or Category 3
requirements depending on the safety rating and installation of the mat(s).
The Safety Controller enters a Lockout mode when an open wire, a short to 0
V, or a short to another source of power is detected.
6.4.10 Muting Sensor
Safety device muting is an automatically controlled suspension of one or more safety input stop signals during a
portion of a machine operation when no immediate hazard is present or when access to the hazard is safeguarded. Muting
sensors can be mapped to one or more of the following safety input devices:
• Safety gate (interlocking) switches
• Optical sensors
• Two-hand controls
• Safety mats
• Protective stops
US and International standards require the user to arrange, install, and operate the safety system so that personnel are
protected and the possibility of defeating the safeguard is minimized.
Examples of Muting Sensors and Switches
Photoelectric Sensors (Opposed Mode)
Opposed-mode sensors should be configured for dark operate (DO) and have open (non-conducting) output contacts in a
power Off condition. Both the emitter and receiver from each pair should be powered from the same source to reduce the
possibility of common mode failures.
Photoelectric Sensors (Polarized Retroreflective Mode)
The user must ensure that false proxying (activation due to shiny or reflective surfaces) is not possible. BERNSTEIN low
profile sensors with linear polarization can greatly reduce or eliminate this effect.
Use a sensor configured for light operate (LO or N.O.) if initiating a mute when the retroreflective target or tape is detected
(home position). Use a sensor configured for dark operate (DO or N.C.) when a blocked beam path initiates the muted
condition (entry/exit). Both situations must have open (non-conducting) output contacts in a power Off condition.
European Applications
4-Wire
WARNING: Avoid Hazardous Installations
Two or four independent position switches must be properly adjusted or positioned so that they close
only after the hazard no longer exists, and open again when the cycle is complete or the hazard is again
present. If the switches are improperly adjusted or positioned, injury or death may result.
The user is responsible to satisfy all local, state, and national laws, rules, codes, and regulations relating
to the use of safety equipment in any particular application. Make sure that all appropriate agency
requirements have been met and that all installation and maintenance instructions contained in the
appropriate manuals are followed.
