6.3.8 Trip Test
After optimizing the optical alignment and configuring fixed blanking , muting, and/or reduced resolution (if applicable),
perform the trip test to verify the detection capability of the EZ-SCREEN LPM System. This test also verifies correct sensor
orientation, identifies optical short circuits, and verifies the expected resolution for applications using reduced resolution.
After the installation has passed the trip test, the safety outputs may be connected and the commissioning checkout may
be performed (initial installations only).
1.
Select the proper test piece supplied with the receiver.
Table 2: Appropriate Test Pieces for Trip Test
Reduced Resolution 14 mm Resolution Models 25 mm Resolution Models
Off 14 mm (0.55 in) dia. Model STP-13 25 mm (0.98 in) dia. Model STP-16
On (2-beam) 34 mm (1.34 in) dia. Model STP-17 65 mm (2.56 in) dia. Model STP-18
2. Verify that the System is in Run mode, the Green Status indicator is On (or flashing
if reduced resolution is enabled),
all Zone indicators are green, and the amber Status indicator is On. A manual reset may be required in Latch mode.
3. Pass the specified test piece through the defined area in three paths: near the emitter, near the receiver, and
midway between the emitter and receiver.
Receiver
Emitter
Test Piece
Figure 23. Trip Test
4. During each pass, while the test piece is interrupting the defined area, at least one Zone indicator must be Red. The
Red Zone indicator must change with the position of the test piece within the defined area.
• Trip Output Operation: The Status indicator must turn red and remain red for as long as the test piece
remains in the defined area. If not, the installation has failed the trip test.
•
Latch Output Operation: The Status indicator must turn red and remain red. The amber Reset indicator must
remain ON steady. If the Reset indicator begins to flash at any time while the test piece is interrupting the
defined area, the installation has failed the trip test.
If all Zone indicators turn green or fail to follow the position of the test piece while it is within the
defined area, the
installation has failed the trip test. Check for correct sensor orientation , reflective
surfaces, and unguarded areas
created due to the use of Blanking. Do not continue until the situation is corrected.
When the test piece is removed from the defined area, in trip output operation, the green Status indicator must turn
on (or flash green, if reduced resolution is enabled). In latch output operation, the Status indicator will remain red
until a manual reset is performed (the amber Reset indicator will be flashing).
WARNING:
• Trip test failure
•
Using a system that has failed a trip test can result in serious bodily injury or death. If the
trip test has failed, the system might not stop dangerous machine motion when a person
or object enters the sensing field.
• Do not attempt to use the system if the system does not respond properly to the trip test.
5. If mirrors are used in the application: Test the
defined area on each leg of the sensing path (for example, emitter to
mirror, between mirror and receiver).
EZ-SCREEN Low-Profile System with Integral Muting
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