- 38 -
S
WITCHING THE
S
YSTEM FROM
O
N
-L
INE TO
M
ANUAL
B
YPASS
The following operations have to be performed in order to switch the UPS load to “Manual Bypass”.
NOTE:
if the Bypass line is not present, the manual bypass operation will cut off power to the load.
With the SWMB closed, the load is supplied directly from the bypass line.
The switching of the System to manual bypass can be done following this procedure:
Verify that no anomalies are present on the system status bar.
Verify that the bypass voltages are correct on the “System measurements” page (the message “Bypass voltage out of
range” should not be present).
Verify that the inverter is synchronized to the bypass line.
Remove the Maintenance Bypass locking paddle from the breaker.
Verify from the display that the system switches to the static bypass.
Close the SWMB switch.
The load is now supplied directly by the bypass line through the manual bypass switch.
From the “Command Panel” page, press the “System OFF” icon to switch the system off.
NOTE:
1. In case of an installation with external SWMB switch, verify first the proper connection of the respective Auxiliary Contact.
2. If the UPS is in battery mode and/or if the bypass line is not present, activating the maintenance bypass will shut off the
power supply to the load.
3. During this phase, with a load powered via the maintenance bypass, any disturbances on the mains power supply line of the
UPS will directly affect the connected load (The load is connected directly to the incoming mains. The UPS is no longer
active).
Below is a list of the operations to be performed in order to carry out maintenance work on the equipment without shutting off the
power supply to the connected load:
WARNING: Maintenance works inside the UPS are to be performed exclusively by qualified staff.
ATTENTION: In order to perform a complete discharge of the voltages present within the UPS, follow carefully
the below operations.
After putting (if necessary) the UPS in maintenance bypass mode, turn off the system from the display menu.
Open the input breakers SWIN and SWBYP (if present) and output switch SWOUT (if present) but leave the battery breaker
in closed position.
Wait for a few minutes (until the LCD display goes off) to let the UPS perform the discharge of DC link.
When the display switches off, disconnect all battery cabinet switches.
Wait for a minimum of 15 minutes to allow the electrolytic capacitors on the power modules to completely discharge and then
perform the maintenance operations.
Having completed the maintenance operations, proceed to restart the UPS following the correct procedure.
