Lucent Technologies Lineage
®
2000 125A Ferroresonant Rectifier J85502C-1
6 - 20 Testing
Issue 8 July 1999
Backup High
Voltage
Shutdown
(HVSD) Test (On
Line)
If the DC OUTPUT circuit breaker is On, turn it Off (down).
1. Disable the internal selective HVSD by moving the Q
(P15) or T(P16) movable straps on CM1 to the Charge
position (see Figure 6-2). Verify that moveable strap P14
remains in the 2-3 (NOT the Charge) position for this test
and after the rectifier is placed into service. The P14
Charge position is only used to raise the Backup HVSD
level of the rectifier when it is being used for applying the
initial charge to connected batteries.
2. Set the DMM to measure 27 or 54 volts, and connect it to
the input conductor (top) of CBA1 and the rectifier ground
bus (see Figure 5-4). This bus is the + filter capacitor bus
for positive ground plants, and the – filter capacitor bus for
negative ground plants.
3. Slowly turn the OUTPUT VOLTS ADJ potentiometer
clockwise until the rectifier shuts down. This should occur
between 29 and 31.25 volts (24-volt rectifier) or between
58 and 62.5 volts (48-volt rectifier). The RFA lamp on the
rectifier should light.
To increase the upper range of the voltage adjustment,
short resistor R22 (24-volt version) or R21 (48-volt
version) on the CM1 board.
When this step is completed, restore R21 or R22. If the
rectifier has List WB (external HVSD option), leave straps
Q and T on CM1, in the charge position, pins 1 and 2. If
the rectifier is not equipped with List WB, place Q and T in
the normal position, pins 2 and 3.
4. Turn the OUTPUT VOLTS ADJ potentiometer
counterclockwise.
5. Restart the rectifier by turning the POWER switch Off
then back On.
6. Adjust the voltage to approximately 26.0 volts (24-volt
rectifier) or 52.0 volts (48-volt rectifier). The RFA lamp
on the rectifier should go out.
