Standard 1460, Руководство пользователя

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1460/61 INSTRUCTION MANUAL
Page 17
3.) Perform a bench test on the 1461:
CAUTION: ELECTRIC SHOCK HAZARD! Ensure that ALL sources of electrical power are
disconnected from the 1461 PRIOR TO performing adjustments and optional module
installations so that no accidental contact with energized parts can be made.
a.) Connect a temporary AC power source to the to the 1461. The temporary AC power source
should be equipped with a switch capable of disconnecting AC power from the 1461. The wiring
diagrams on page 20 show the proper connections to external AC power terminal block of the
1461.
CAUTION: RISK OF ELECTRIC SHOCK! Chassis ground (“GND” terminal) MUST be connected to
conduit/Earth ground to provide proper protection from electric shock.
NOTE: Chassis ground (“GND” terminal) MUST be connected to conduit/Earth ground to provide proper
protection of Master Time Programmer circuitry.
NOTE: Do not connect field devices at this time.
b.) Apply power to the 1461 by switching on the temporary AC power source.
i.) The 1461 should show the time and date (there may be as much as a 30 second delay after
power up for the display to show time and date).
ii.) The LEDs on the main board (and on the 1464R(s), if installed) blink at a rate of about once
per second.
C.) Adjusting the Display
1.) Adjust the contrast of the display, if necessary.
a.) Contrast affects the display’s readability. The following diagram will help you decide if the
contrast of your display needs to be adjusted. IF CONTRAST OF THE DISPLAY IS ACCEPT-
ABLE, SKIP THE REMAINDER OF STEP 1.
b.) If the contrast needs to be adjusted, locate jumper W1 on the CPU board (see diagram on page
21). W1 sets the contrast for the display. If W1 is removed, the contrast becomes lighter. If W1
is installed, the contrast becomes darker.
c.) Remove power to the 1461 by switching its temporary AC power source off.
d.) Adjust the contrast of the display.
i.) If contrast is too dark, cut jumper W1 of the CPU board.
ii.) If contrast is too light and jumper W1 of the CPU board is already cut, re-install jumper W1.
e.) Restore power to the 1461 by switching its temporary AC power source on.
i.) The 1461 should show the time and date.
ii.) The LEDs on the main board (and on the 1464R(s), if installed) blink at a rate of about
once per second.
INSTALLATION
TOO
DARK
Contrast is too dark- text is difficult to read
through the darkened background
GOOD
CONTRAST
Good contrast- text is easy to read
Contrast is too light- text is not dark enough to
read
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