16
MASTERYS
BC 60-80 kVA - Ref.: IOMMASBCXX06-EN 06
3. MODES OF OPERATION
3.4. OPERATION WITH EXTERNAL MANUAL BYPASS (optional)
The external maintenance bypass may be placed on the general distribution panel when the UPS is installed, or by installing the
bypass panel that is supplied on request.
If the UPS has an input for the auxiliary power supply the
Q2
switch must be connected to this input and the main power supply
input must be disconnected on the control panel.
If the maintenance bypass is activated with the appropriate procedure the load is powered directly from the maintenance bypass,
while the UPS is separated from the power supply and can be switched off.
This operating mode can be selected for maintenance to be carried out on the system so that the necessary actions can be perfor-
med by service personnel without having to disconnect the power supply to the load.
3.4-1
3-phase input/3-phase output for UPS 3/3
3.4-2
3-phase input/1-phase output for UPS 3/1
Key
Q1
Bypass switch
Q2
Mains power switch
Q3
Output switch
Bypass panel connection diagram
Mains
L3
L2
L1
L3
L2
L1
L1
N
N
Load
IN
UPS
N
L1
L2
L2
L3
L3
N
OUT
Q1
Q2
Q3
Mains
L3
L2
L1
L3
L2
L1
Lo
N
N
Load
IN
UPS
N
Lo
N
OUT
Q1
Q2
Q3
