Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 55)

Rockwell Automation Publication 440C-UM001C-EN-P - November 2014 55
Safety Monitoring Functions Chapter 9
Table 4 - Muting and Synchronization Timing Selections
2-Sensor L-Type Muting
The sensors and light curtain form the shape of the letter “L”, when viewed from
the side. The muting sensors (MS) are mounted on one side of the light curtain
(LC).
Figure 49 - 2-Sensor L-Type Muting Arrangement
The material must first break MS1, then MS2 and then the light curtain. As the
material progresses, the material must clear MS1 and then MS2. The muting
lamp turns on and the light curtain is muted after MS2 is blocked. The conveyor
can only move one direction.
In the example below, the OSSD outputs of the light curtain are connected to
terminals 00 and 01. The two muting sensors are connected to terminals 02 and
03. The momentary, normally open override switch is connected between
terminals 12 to 04 to take advantage of pulse testing. Contactor K1 and K2,
which provide power to the conveyor (and other hazards if necessary), are
connected to terminals 18 and 19.
The muting lamp is connected to terminal 13; this terminal should be configured
with no pulse testing. Filament lamps will not be affected by pulse testing, but
LED lamps may appear to flicker if pulse testing is enabled.
Muting Time Synchronization Time Muting Time Synchronization Time
10 s 3 s 900 s (15 min) 90 s
20 s 3 s 1800 s (30 min) 180 s (3 min)
30 s 3 s 3600 s (1 hr) 180 s (3 min)
60 s (1 min) 6 s 28,800 s (8 hr) 180 s (3 min)
300 s (5 min) 30 s Infinite Infinite
IMPORTANT The 2-L muting arrangement must only be used for material exiting the hazard
area. It must not be used for material entering the hazard area.
Machine
MS1 MS2
LC
Muting Lamp
Material Conveyor
Mut
ed L
C