5 System Operation
5.1 Security Protocol
Certain procedures for installing, maintaining, and operating the EZ-SCREEN Type 2 must be performed by either
Designated Persons or Qualified Persons.
A Designated Person is identified and designated in writing, by the employer, as being appropriately trained and
qualified to perform system resets and the specified checkout procedures on the EZ-SCREEN Type 2. The Designated
Person is empowered to:
•
Perform manual resets and hold possession of the reset key (see
Reset Procedures
on page 37)
•
Perform the Daily Checkout Procedure
A Qualified Person, by possession of a recognized degree or certificate of professional training, or by extensive
knowledge, training, and experience, has successfully demonstrated the ability to solve problems relating to the
installation of the EZ-SCREEN Type 2 System and its integration with the guarded machine. In addition to everything for
which the Designated Person is empowered, the Qualified Person is empowered to:
•
Install the EZ-SCREEN Type 2 System
•
Perform all checkout procedures
•
Make changes to the internal configuration settings
•
Reset the System following a Lockout condition
5.2 Reset Procedures
System resets are performed using an external reset switch. This switch must be located outside the guarded area, and
must not be within reach from within the guarded area (see
Reset Switch Location
on page 15). Its location should provide
a clear view of the entire safeguarded area. If any hazardous areas are not in view from the switch location, additional
means of safeguarding must be provided. The switch should be protected from accidental or unintended actuation (for
example, through the use of rings or guards).
If supervisory control of the reset switch is required, a key switch may be used, with the key kept in the possession of a
Designated or Qualified Person. Using a key switch provides some level of personal control, since the key may be removed
from the switch. This hinders a reset while the key is under the control of an individual, but must not be relied upon solely
to guard against accidental or unauthorized reset. Spare keys in the possession of others or additional personnel entering
the safeguarded area unnoticed may create a hazardous situation.
5.2.1 Receiver Resets
The EZ-SCREEN Type 2 receiver has a Reset input, pin 8 (violet wire), that provides for a manual reset input signal.
Receiver manual resets are required in the following situations:
•
Trip Output operation – only after a Lockout (see
Troubleshooting and Lockout Conditions
on page 40 for
causes).
•
Latch Output operation – at power-up, after each Latch condition occurs, or after a Lockout.
Reset Routine
To reset the receiver, close the reset switch for 1/4 to 2 seconds, then open it. An alternative method to reset either
component is to power the sensor down, then power it up.
NOTE: Closing the reset switch too long will cause the sensor to ignore the reset request; the switch
must be closed from 1/4 seconds to 2 seconds, but no longer.
5.2.2 Emitter Resets
In the rare occurrence that an emitter requires a reset, power the sensor down, then power it up. Emitter resets are
needed only if a Lockout occurs.
5.3 Status Indicators
The emitter has one LED and the receiver has four, to provide an ongoing indication of light screen and system operation.
In normal operation, the status indicators are as described below and as shown in
Figure 21
on page 38. Additional LED
condition combinations indicate errors or faults; refer to
Troubleshooting and Lockout Conditions
on page 40.
EZ-SCREEN
®
Type 2 Light Screen
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
