Xtreme Power Conversion Corporation
E90 Service Manual
Page 36
Uninterruptible Power Supply
To avoid electrostatic discharge damage, ensure that the maintenance is under the ESD safe conditions
- work on an anti-static mat;
- ground yourself and the unit when it is opened.
Be careful when disconnect the battery:
- Do not wear metal bracelets and etc.
- do not short circuit the batteries
If the UPS must be repaired during the operation such as measurement, Make sure that the power supply is
isolated. In this case, a transformer can be used between the UPS and power.
Before maintenance, this manual should be entirely read.
Shutdown-disassembly/reassembly UPS
Warning: when UPS works, a large amount of energy is stored in the internal BUS capacitor, no electricity cannot
be guaranteed inside the UPS with mains isolation, so it needs extra attention when maintenance. Disconnect
all external input power of the fault machine for maintenance, After opening the case, use the bleed resistor to
release the energy stored in BUS capacitor to avoid injury to person.
3.1Please refer to the user’s manual on UPS installation content;
3.2 First read chapter 2 “Security conditions”
3.3 If the UPS is in need of repair, the process A operation is recommended(This is completely safe) :Disconnect
all input power supply and battery. Load is allowed to turn off for process A. The specific steps can be seen in
chapter 3.
If the load is not allowed to turn off, please enter the maintenance bypass mode for maintenance. Follow the
process B (refer to chapter III for specific information) . Please note that the do the maintenance in maintenance
bypass mode is not absolutely safe, Part of circuits are still at work.
In maintenance mode, the load is directly connected to the power via the bypass, so the UPS will not provide any
protection.
Step A:the load may be closed
A1 Turn off the load, disconnect all input power supply and battery;
A2 Make input/output/battery air-switch on “OFF” state
A3 Remove the right panel, left panel and top cover, do the maintenance
A4 Install the right and left panel, top cover
A5 Tighten the four screws;
A6 Connect the mains/battery/load, switch on the battery switch, press the start key to start the unit
A7 If UPS has no fault, it will has output when output switch is switched on.
A8 Switch-on the input switch, the UPS will transfer to mains, and charge the battery.
A9 Close the front door.
Step B: The load may not be closed.
B1 remove the maintenance screws and baffles to check whether the machine enter the maintenance bypass
mode
B2 If the UPS goes to the maintenance bypass mode, switch on the maintenance bypass switch, otherwise do the
maintenance in accordance with the process A;
B3 Remove the right panel, left panel and top cover, do the maintenance
B4 Install the right, left panels and top cover
B5 Switch on the input/output switch, the UPS enter the maintenance bypass mode
B6 Switch off the maintenance switch, install baffles and screws, the unit goes to the bypass mode;
B7 If both the mains and battery are normal, the unit goes into the line mode and charging after a period of time;