Tek-Trol TEK-LCD 7800A-0L1, Instruction Manual

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3 Setup and Programming
3.1 Overview
Setup and programming are done through the infrared through-window buttons or using the
mechanical buttons when uncovered. There are two slide switches located on the connector board.
One is used to select backlight power (if equipped) and the other is to lock or unlock the through-
window buttons.
After all connections have been completed and verified, connect the ribbon cable to the display
module, fasten the display module to the base, install enclosure cover, and then apply power.
3.2 Through-Window Buttons
The Tek-LCD 7800A-0L1 is equipped with four sensors that operate as through-window buttons so
that it can be programmed and operated without removing the cover (and exposing the electronics)
in a hazardous area. These buttons can be disabled for security by selecting the LOCK setting on the
SAFE-TOUCH BUTTONS switch located on the connector board in the base of the enclosure.
3.2.1 Through-Window Button Operation
To actuate a button, press and remove one finger to the window directly over the marked button
area. Remove finger to at least 4 inches away from the window in between button activations.
Through-window and mechanical buttons may be held to cycle through menus or digits in place of
repeatedly pushing a button.
The sensors are disabled when a mechanical button is pressed and will automatically be re-enabled
after 60 seconds of inactivity.
3.2.2 Through-Window Button Tips and Troubleshooting
The through-window buttons are designed to filter normal levels of ambient interference and to
protect against false triggering, however it is recommended that the through-window buttons be
turned off (slide SAFE-TOUCH BUTTONS switch to OFF) if there is an infrared interference source in
line-of-sight to the display or if the buttons are not needed.
Through-window button Tips:
•
To the extent possible, install the display facing away from sunlight, windows, reflective
objects and any sources of infrared interference.
•
Keep the window clean.
•
Tighten the cover securely.
•
Use a password to prevent tampering.
•
If the cover has not been installed and secured tightly, it may take a moment for the
through-window buttons to properly self-calibrate when the cover is tightened.
There is no need to recalibrate the meter for milliamps when first received from the factory.The
meter is factory calibrated for milliamps prior to shipment. The calibration equipment is certified
to NIST standards.