APC SILCON 990-4053 - Manual (Page 51)

Options/Accessories
990-4053
Installation Guide APC Silcon 480kW 400V UPS 51
Step 1-4 can be carried out with any of the parallel systems, however this will switch
all systems into bypass operation.
1. Press on the keyboard
2. Press or on the keyboard until
3. Press on the keyboard
4. Press on the keyboard
All systems will transfer to bypass operation
Do not switch off any of the UPS systems
until step 5-8 has been completed.
5. Check lamp indication on the Service Bypass Panel
6. Turn the external bypass switch (Q003)
to position ”1“
7. Turn the output isolator (Q004) to position ”0“
8. Turn the output switches (Q002) to position ”0“
9. Open the front door and press both the green
”ON“ and the red ”OFF“ keys simultaneously in
any of the systems
The acoustic alarm sounds for 30 sec.*
Repeat for (all) other system(s).
10. Turn all input switches (Q001) to position ”0“
The red alarm LED below the display lights
and the acoustic alarm sounds for 30 sec.
* The acoustic alarm can be reset by the key
Bypass operation
:NO
Bypass operation
:YES
Display shows
Lamp indication
on bypass panel
The green lamp (H003)
above the bypass switch
handle (Q003) lights
The green lamp (H004)
above the output isolator
(Q004 and the green lamps
(H002) above the output
switch handles (Q002) lights
The green lamps (H002)
above the output switch
(Q002) light and the green
lamp (H004) above the output
switch (Q004) lights
Now the lamps (H002)
above the output switch
handles (Q002) light and the
green lamp (H004) above the
output switch (Q004) lights
** System OFF **
Display shows
Action
Bypass operation