Xtreme Power Conversion Corporation
E90 Service Manual
Page 46
Uninterruptible Power Supply
INV inductor board
NO.
Description
Type
Checked compo-
nents
Detect
Pin
Meter stall
Normal
abnormal
1
INV
FUSE
F1-3
Ω
0Ω
open
2
INV
SCR
SCR1-6
A/K
Ω
Open
Short
3
INV
SCR
SCR1-6
G/K
Ω
20~40Ω
open or
short
4
INV
Relay
RLY1-3
1/3
Ω
open
short
INV power board
NO.
Description
Type
Checked compo-
nents
Detect
Pin
Meter stall
Normal
abnormal
1
INV
IGBT
Q1-12
E->C
diode
≈0.4V
open or
short
2
INV
IGBT
Q1-12
G/E
Ω
≈10KΩ
open or
short
3
Auxiliary
power
FUSE
F1
Ω
0Ω
open
4
Auxiliary
power
MOS
-
FET
Q14-15
S->D
diode
≈0.46V
open or
short
5
Auxiliary
power
MOS
-
FET
Q14-15
G/S
Ω
≈10KΩ
open or
short
Stand-alone commissioning
Warning: When UPS is working, the internal Bus capacitor stores a lot of energy. But isolated with mains cannot
guarantee completely no electricity inside the UPS and need extra attention when do the maintenance. When
cut off all the external input power supplied for maintenance, use the bleed resistor to release the energy stored
in Bus capacitor after open the case firstly to avoid causing injury to persons.
Please refer to the “UPS repair/maintenance”, especially the “Security maintenance conditions” and “ Close-
Disassembly/Reassembly UPS”.
The stand-alone commissioning requires intact UPS.
Startup steps
1) Before startup, confirm that the input/output connection is correct; measure the positive and negative battery
voltage, battery breaker is temporarily open.
2) Close the UPS Output switch.
3) Close the UPS input switch. Close external input mains and start UPS by AC.
4) After AC start, check the LCD menu, working mode, matching ID number, the VA of UPS, output voltage
level and the frequency is the same with the actual values.( refer to the following pictures). If not the same,
immediately disconnect the mains to check or cal the customer service hotline.