Xtreme Power Conversion Corporation
M90S Service Manual
Page 26
Uninterruptible Power Supply
LCD Message
Explanation
Solution
Warning! Control
Module SPS 1 Fault
As stated.
Contact service personnel.
Warning! Control
Module SPS 2 Fault
As stated.
Contact service personnel.
Troubleshooting in other cases
Problem
Possible cause
Action
Battery discharging
time diminishes
Battery not yet been fully
charged.
Keep UPS connected to utility power persistently
for more than 10 hours to recharge the batteries.
UPS overload.
Check the loads and remove some non-critical
loads.
Battery aged.
Replace the batteries.
Charger failed.
Replace the charger.
The UPS cannot power
on after pressing the
button
The button is pressed too briefly. Press the button continuously for more than 0.5s.
Battery is not connected or bat
‐
tery voltage is too low.
Check the battery.
UPS failure.
Repair the UPS.
7.4 Troubleshooting
In this section, some debug skills are listed to help you finding the failure components and problems as soon as
possible. Before taking the following steps, we suggest that you should read problem shooting chart in previous
section then check the boards listed in section 5 to find out which board is failure.
Basic Instruments and tools:
1. One computer with RS232 port and one standard RS232 cable;
2. Wire cutters and clamps;
3. One electric soldering iron;
4. One multimeter;
5. One oscilloscope(voltage and current probe needed);
6. Diagonal pliers, snipe nose pliers, cross screwdrivers (150mm/75mm length), straight
screwdrivers (75mm length) and PVC insulating tapes etc;
7. Make-self tools include: Balance voltage test equipments, current limiting resistors, tubes and
clamp terminals with different specifications;
Parameter Setting Method:
1. Connect the RS232 port of the UPS to the RS232 port of the computer with RS232 cable.
Choose the “Start/Program/Accessory/Communication/Hyper terminal” and start Hyper terminal
application. Set the COM port for “COM1” and the other setting as Figure 7.1.