12
REPAIR AND MAINTENANCE
Repair and Maintenance
The SEI DC-UPS is engineered to operate unattended and with low maintenance
overhead for extended periods of time. Although the electronics within the DC-UPS
require no routine maintenance, the battery charge voltage may drift with time and
operating temperature. The DC-UPS continuously monitors the battery charge
voltage. If the battery charge voltage is out of adjustment, the Battery Charge Status
indicator will flash red.
Tools and Test Equipment
No special tools other than those normally contained in an electronic technicians
toolkit are required to service the DC-UPS. To check the system voltage and reset as
necessary, it is recommended that a quality digital voltmeter (DVM) be used.
Rectifier Adjustment Procedure
The rectifier should only be adjusted with the nominal system load connected.
Connect a DVM to one of the external battery connectors. Measure the voltage; it should
be between 27.0 and 27.7 volts. If the measured voltage is outside of this range, perform
the following steps:
1. Remove the battery fuse located on the right side panel. Disconnect any
external battery packs.
2. Loosen the front panel mounting screws and remove the front panel.
3. Connect the digital voltmeter to one of the external battery (2 pin)
connectors of the unit
4. Locate the blue potentiometer in the center of the right edge of the
rectifier. Adjust the potentiometer on the power supply until the voltmeter
reading is 27.4 Vdc.
5. Replace the front panel.
6.
Re-install the internal battery fuse and re-connect any external
battery packs
.
