Vertiv EXM 0080kTK16FN01000, User Manual

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Chapter 7 Parallel System And LBS System 103
Liebert EXM 80kVA ~ 200kVA UPS User Manual
J3 3.3
EPO
UPS1
EPO
UPS 2
UPS1
UPS 2
J3 3.4
J3 3.3
J3 3.4
J3 3.1
J3 3.2
J3 3.1
J3 3.2
board
Communication
Communication
board
Communication
board
Communication
board
board
J2 2.3
EPO
EPO
UPS 2
UPS 1
UPS 2
UPS 1
J2 2.3
J2 2.4
J2 2.1
J2 2.2
Bypass module
Bypass module
J2 2.3
J2 2.4
Bypass module
J2 2.1
J2 2.2
Bypass module
Figure 7-4 EPO circuit diagram
Note: In Figure 7-4, the upper one is Normally Open type, and the lower one is Normally Closed type.
7.3 Operation Procedures For Parallel System
Warning
If UPS input uses RCD, differential switch is only used in the system's bypass mains supply. At the moment of
electrical connection, current may not be immediately separated, which may result in the tripping of RCCB
respectively.
Only one step is needed for once, and only after finishing this operation step of each UPS module, the next
step can be carried on.
7.3.1 Startup Procedures In Normal Mode
These procedures are applicable to start the UPS under total power-down state, which means the UPS or
the maintenance bypass switch has not supplied the load before. Make sure UPS has been completely
installed and commissioned by the engineer, and external power supply switch has been turned off.
Warning
1. These procedures result in mains voltage being applied to the UPS output terminals.
2. If any load equipment is connected to the UPS output terminals, check with the user that it is safe to apply power.
If the load is not ready to receive power, disconnect the downstream load switch, and stick a warning label on the
connection point of the load.