Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000
Alarms, Controls, and Displays 7 - 3
Displays, continued
Voltage Adjust
The V Adj feature on the faceplate of the control units allows users to
adjust the rectifier output voltage.
•
The ES646, ES646B, and ES647 have an adjustment range from
48-57V.
•
The ES648A/B/C/BZ control unit can permanently set the plant
voltage between 52V and 55V. If the plant voltage is set outside this
range, for example, higher than 55 volts to test the high voltage
shutdown features, the plant voltage reverts back to its last valid
setpoint. The ES648A/B/C/BZ can temporarily adjust the plant
voltage between 47.6 and 56.5 volts.
•
When turning the voltage adjust screw on the ES648A/B/C/BZ
control unit, temperature compensation is temporarily disabled.
Temperature compensation returns approximately 10 seconds after
the operator stops turning the voltage adjust screw.
•
If the control unit fails, the plant output voltage reverts to its preset
voltage at 52 volts.
Front Panel Test
Jacks
Test points are provided on the front panel so that the plant’s primary
voltage may be checked with an external meter. The test points are
current-limited to protect against accidental short-circuits.
Front Panel Meter
A 3-1/2 digit, backlit liquid-crystal display is located on the faceplate of
the ES646, ES646B, and ES648 MCUs. A toggle switch next to the
display selects either the plant voltage or the plant current to be
displayed. When the meter select switch is set in the current position, the
display indicates primary bus output current. When the meter select
switch is set to voltage, the display indicates the primary bus (rectifier)
output voltage.
LED Test Button
Depressing the LED Test button on the MCU will cause all of the LCD
segments to display 188.8 and all LEDs in the -48V CPS to light. If the
button is depressed for 6 seconds, the MCU will initiate self-diagnostics.
The button may be released as soon as the self-diagnostics start.
