Liebert 130 kVA - Manual (Page 36)

User Manual
Hipulse - Single Phase ‘1+N’ UPS System 130 kVA - 110V
16
Parallel 1+N:
Use of differential circuit breakers on UPS unit inputs in a configuration with separate
inputs and one battery for each unit requires installation of a common device only on
the System Bypass Mains.
Use of differential circuit breakers on UPS unit inputs sharing a common battery
requires installation of device common to all the input lines. If inputs are configured
for separate mains, a common device will also be required for all System bypass
mains.
UPS Battery:
The UPS Battery is protected by means of a control circuit that operates the tripping
mechanism of an automatic circuit breaking device (having a variable trip setting).
The tripping mechanism using an undervoltage release coil that operates on a present
minimum voltage level.
The circuit breaker is essential for maintenance of the battery and is normally located
near to the battery installation. The characteristics and operation of the automatic
circuit breaker are given in Chapter 6.
Output of the System:
In the eventuality that an external distribution panel is used for load distribution, the
selection of protective device must proved discrimination with those that are use at
the input to the UPS module.
3.1.7 Cabling procedure
Once the equipment has been finally positioned and secured, connect the power
cables as described in the following procedure.
Study the connection diagram in the figures below.
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.
3. Connect the safety earth and any necessary bonding earth cables to the copper
earth bus busbar located on the floor of the equipment below the power connections.
Note: The earthing and neutral bonding arrangement must be in accordance with local and national
codes practice
Input Connections:
4. Connect the a.c. input supply cables to the input busbars (U1-V1-W1 terminals)
and the bypass a.c. supply cables to the bypass busbars (U3 - N3 terminals) and
tighten the connections.
ENSURE CORRECT PHASE ROTATION
Output System Connections:
5. Connect the system output cables between the output busbars (U2 - N2 terminals)
and the critical load and tighten the connections.