Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 43)

page 43
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
System Operation
EZ-SCREEN Grid
Instruction Manual
4.4 Normal Operation
System Power-Up
The System will power up in one of two ways, depending on the Trip/Latch
output configuration. If the System is set for Trip output, it will power up and
reset automatically; if the System is set for Latch output, it will require a manual
reset procedure after power-up and sensor alignment.
Trip Output Mode Power-Up: When power is applied, each sensor will conduct
self-tests to detect critical internal faults, determine configuration settings, and
prepare the System for operation. (If either sensor detects a critical fault,
scanning ceases, the receiver outputs remain OFF and diagnostic information is
displayed through the sensor’s front window.) If no faults are detected, the
System will automatically enter Alignment mode, with the receiver looking for an
optical sync pattern from the emitter. If the receiver is aligned and receiving the
proper sync pattern, it enters Run mode and begins scanning to determine the
blocked or clear status of each beam. No manual reset operation is required.
Latch Output Mode Power-Up: When power is applied, each sensor will conduct
self-tests to detect critical internal faults, determine configuration settings, and
prepare the System for operation. (If either sensor detects a critical fault,
scanning ceases, the receiver outputs remain OFF and diagnostic information is
displayed through the sensor’s front window.) If no faults are detected, the
System will automatically enter Alignment mode, with the receiver looking for an
optical sync pattern from the emitter. If the receiver is aligned and receiving the
proper sync pattern, it begins scanning to determine the blocked or clear status
of each beam. When all beams are aligned, the Yellow Reset indicator will
double-flash to indicate the System is waiting for a manual reset. After a valid
manual reset, the System enters Run mode and continues scanning.
During RUN Mode
Trip Output Configuration: If any beams become blocked while the System is
running with Trip output mode selected, the receiver outputs turn OFF within
24 ms (the maximum System response time). If all the beams then become clear,
the receiver outputs come back ON. No resets of any kind are needed. All
required machine control resets are provided by the machine control circuit.
Latch Output Configuration: If any beams become blocked while the System is
running with Latch mode selected, the receiver outputs turn OFF within 24 ms. If
all the beams then become clear, the receiver Beam Status indicators will all be
Green and the Reset indicator will single-flash, indicating the System is waiting
for a manual latch reset. In Latch output mode, the outputs come back ON only
when all beams are clear and after a manual reset. The System will wait for a
manual reset; when a valid reset signal is received and all beams remain clear,
the receiver outputs turn ON. To perform a manual reset, close the Reset switch
for 1/4 to 2 seconds, then open the switch. (For switch model MGA-KS0-1,
described in Section 2, turn the key 1/4 turn clockwise, hold for 1/4 to 2
seconds, then turn the key counterclockwise to its original position.)
Internal Faults (Lockouts): If either sensor detects a critical fault, scanning
ceases, the receiver outputs turn OFF and diagnostic information is displayed
through the sensor’s front window. See Section 5 for resolution of error/fault
conditions.