Liebert Hipulse E - Cabling Procedure for 300 Kva UPS with 6 Pulse Rectifier (or 12 Pulse Rectifier)

Chapter 2 - Installation Procedure Liebert Hipulse E Installation Manual
Installation (Electrical) Single or '1+N' UPS System
Page 2-4 (07/04)
2.1.7 Cabling procedure for 300 kVA UPS with 6 pulse rectifier (or 12 pulse rectifier)
Note on 12-pulse UPS: before proceeding with wiring procedures, make the connections between the two cabinets,
referring to the detailed description provided in section 2.1.8 – 12-phase wiring procedure (for300 kVA UPS).
Once the equipment has been finally positioned and secured, connect the power cables as described in the following
procedure.
Study the connection diagram as illustrated in Chapter 6.
1. Verify that the UPS equipment is totally isolated from its external power source and all the UPS power isolators
are open. Check that these supplies are electrically isolated, and post any necessary warning signs to prevent
their inadvertent operation.
2. Open the door(s) to the UPS cabinet and remove the lower protective cover to gain access to the connections
bars. The protective cover on the UPS cabinet must be removed subsequent to removal of the handles on the
power isolators.
3. Connect the safety earth and any necessary bonding earth cables to the copper earth busbar located on the floor
of the equipment below the power connections.
The safety earth cable must be connected to the earth busbar and bonded to each rack\cabinet in the system.
Note: The earthing and neutral bonding arrangement must be in accordance with local and national codes of
practice.
Common Input Connections
4. For common bypass and rectifier inputs, connect the a.c. input supply cables between the mains distribution
panel and the UPS bypass input supply busbars (U3-V3-W3-N3 terminals) and tighten the connections to 45
Nm (M12 Bolts).
Note: With a Class ‘A’ EMC filter (optional) and a ‘common’ input configuration, the capacitors on the
Rectifier input bars must be removed.
ENSURE CORRECT PHASE ROTATION.
Split Bypass Connections
5. If a 'split-bypass' configuration is used, connect the a.c. input supply cables to the rectifier input busbars (U1-
V1-W1 terminals) and the a.c. bypass supply cables to the bypass input basbars (U3-V3-W3-N3 terminals)
and tighten the connections to 45 Nm (M12 Bolts).
WARNING
Ensure that any links ( ) fitted between rectifier input and bypass busbars are
removed (see figures 6.1.10)
ENSURE CORRECT PHASE ROTATION.