ADCP-75-210 • Issue 1 • March 2007
Page 24
© 2007, ADC Telecommunications, Inc.
1.8.2 Low Voltage Disconnect (LVD) Unit
The Low Voltage Disconnect (LVD) Unit (Figure 19) disconnects power automatically when
the RAN voltage falls below a specified minimum. The LVD unit also manages the backup
batteries (extended or glitch).
Figure 19. Low Voltage Disconnect Unit
Table 12. Rectifier Indicators
REF # DESIGNATION DEVICE FUNCTIONAL DESCRIPTION
1 (Unmarked) Green LED AC OK. Lights when AC power is present
2 (Unmarked) Green LED DC OK. Lights when rectifier is limiting current
3 (Unmarked) Red LED Over Voltage Protection. Lights when rectifier has failed
4 (Unmarked) Red LED Over Temperature Protection. Lights when over temperature compen-
sation circuit is active
Table 13. LVD Indicators
REF # DESIGNATION DEVICE FUNCTIONAL DESCRIPTION
1 OK Green LED Okay. Lights when power system is functioning correctly
2 MAJ Red LED Major Fault. Lights when a major fault exists
3 MIN Yellow LED Minor Fault. Lights when a minor fault exists
4 (Unmarked) 9-pin connector Connector for cable 1001476P001 to the RECT (RJ45 connector)
port on the STF module
5 LVD Red LED Low Voltage Disconnect. Lights when switch has closed due to low
voltage
6 DISC Switch Disconnect. Pressing this switch disconnects the backup batteries
1
2
3
4
6
5
OK LED
MAJOR FAULT LED
MINOR FAULT LED
LVD ON LED
21334-A
