Isolation Of One Module In A Multi-Module System; Multi-Module Systems With External Output Cb1; Figure 66 Typical 1+N System Block Diagram With Common Input Supply, With Separate Batteries - Emerson Liebert NX 400V User Manual

7.7

Isolation of One Module in a Multi-Module System

7.7.1

Multi-Module Systems With External Output CB1

Figure 66 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel
Supplied
by Others
Input Mains
Supply L1, L2, L3, N
UPS1
Charger
1. Turn Off inverter.
2. Open External Output isolator (Q1ext or Q2ext).
The UPS enters Isolation Status automatically, parallel signaling and communication becomes
masked, and output becomes inhibited.
3. Power Off unit for maintenance.
4. Power On unit.
5. Unit enters Test Mode by configuration software setting.
6. Diagonosis or testing.
7. The UPS exits Test Mode by configuration software setting.
Output becomes inhabited because of Isolation Status.
8. Return all switches to the Normal position.
9. Close External Output isolator (Q1ext or Q2ext).
The UPS exits Isolation Status automatically, parallel signaling and communication recovers,
Q1
Rectifier
Inverter
Q2
Q3
Q5
L1, L2, L3, N
Q1EXT
QUPS
Distribution Cabinet
To Load
Input Mains
Supply L1, L2, L3, N
UPS2
Charger
Q5
L1, L2, L3, N
Q2EXT
86
Operating Procedures
Q1
Rectifier
Inverter
Q2
Q3
QBYP