Standard 1460, Руководство пользователя

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1460/61 INSTRUCTION MANUAL
Page 18
INSTALLATION
2.) Enable the display’s backlight time-out, if necessary.
a.) Determine if the application requires the display’s backlight to turn off after 2 minutes. If not,
SKIP THE REMAINDER OF STEP 2.
The display is equipped with a backlight. The backlight makes the display easier to read, but
causes the 1461 to draw slightly more current than if the backlight were not present. In most
cases, the extra current consumption is not objectionable.
b.) If the extra current consumption of having the backlight on continuously is objectionable, locate
jumper W2 on the CPU board (see diagram on page 21). W2 is provided as a means to enable
a time-out feature for the backlight. As long as W2 is installed, the display’s backlight will be on
continuously. If W2 is removed, the display’s backlight will be turned off most of the time. If
someone operates the 1461, the display’s backlight will automatically turn on. When the user is
finished operating the 1461, the display’s backlight automatically turns off about 2 minutes later.
c.) Remove power to the 1461 by switching its temporary AC power source off.
d.) Disable/enable the time-out feature of the display’s backlight as required.
i.) To enable the time-out feature, cut jumper W2 of the CPU board.
ii.) If you want the backlight to be on continuously and jumper W2 of the CPU board is already
cut, re-install jumper W2.
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.
3.) Some applications demand a larger display than that of the 1461. For those applications, mount a
secondary clock near the equipment rack the 1461 will be installed into.
D.) Installing the Unit into the Equipment Rack:
1.) Prepare the 1461 for installation into the equipment rack
a.) Remove the temporary AC power source used to bench test the 1461.
i.) Remove power to the 1461 by switching its temporary AC power source off.
ii.) Remove the connections between the 1461 and the temporary AC power source.
b.) Return the top cover of the 1461 onto the chassis. Use the four #6 X 3/8" sheet metal screws
removed in step III.B.2.b. to secure the top cover to the chassis.
CAUTION: ELECTRIC SHOCK HAZARD! Ensure that NO electrical power is present on any wire
before installation.
2.) Mount the 1461 into the equipment rack. Four slotted holes are provided on the front of the chassis.
Use the #10-32 X 3/8" machine screws provided in the installation kit when securing the 1461 to the
equipment rack.
3.) Connect the AC power wires to the 1461. The wiring diagrams on page 20 show the proper connec-
tions 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.
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