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Chapter 7 - General Description
Design Concept
requirements. The load returns to the inverter supply if the power is reduced to a value that can be sustained by the
number of active modules in the system.
Maintenance Bypass
A second bypass circuit contained in the UPS cabinet, identified as the 'Maintenance Bypass' line is included to enable
a 'raw' mains supply to be made available to the load while facilitating a safe working environment for carrying out
scheduled UPS system maintenance or trouble shooting. The circuit is manually selected by the Maintenance Bypass
Isolator which can be padlocked in the OFF position.
The internal maintenance bypass must not be used when the UPS system is comprised of more than two UPS
modules in parallel.
CAUTION: If an automatic circuit breaking device is not present in the input distribution panel, there remains a
dangerously high voltage at the output busbars and also on the input busbars of the UPS module that is switched
off
7.2.4
ECOMODE (for single UPS only)
In this operating mode the System prefers to put the load on the Bypass Mains, with the Inverter on stand-by. The load
is switched over to the Inverter when the mains goes outside of standard frequency and voltage values (or the values as
modified using the operator panel when starting up the system). The ECOMODE configuration requires a different set-
up in the default menu configuration, which may be prepared in the factory before shipment or during installation by
personnel trained in use of the System.
Note: In order to operate in ECOMODE, UPSs must be provided with compatible software versions:
The 'UPS Logic' card must be release 15.0 or later (the SW release of the cards may be read on the front panel display,
referring to Section 8.1.2 Operating Instructions).
Operating procedures in ECOMODE are the same as those described in Chapter 9, except that the load is normally on
the Bypass Mains, the Load led is normally on Inverter (5), and the corresponding alarm message will be replaced with
Load on Mains (6).
7.2.5
UPS Power Switch Configuration
Figure 7-2 illustrates the Liebert Hipulse E UPS module in what is known as the "Split Bypass" configuration. In the
"Split Bypass" configuration the static bypass line is connected by a separate power switch to a dedicated `bypass'
power source which also feeds the maintenance bypass line. Where a separate power source is not available the Bypass
( Q2 ) and Rectifier input supply connections would be linked together.
With the exception of the maintenance bypass isolator, all the isolators shown must be closed during normal UPS
operation.
7.2.6
Battery circuit breaker
The battery should be connected to the d.c. busbar through a circuit breaker fitted inside the battery cabinet –or located
adjacent to the batteries where a battery cabinet is not used. This circuit breaker is closed manually, but it contains an
undervoltage release coil which enables it to be tripped from the UPS control electronics following certain detected
faults. It also has a magnetic trip facility for overload protection.
7.2.7
Battery temperature compensation
Liebert Hipulse E UPS System offers a battery temperature compensation circuit. As the temperature at the battery
location rises the d.c. busbar voltage reduces in order to sustain the battery at its optimum charge voltage. This must be
used in conjunction with the battery temperature sensor board.
7.2.8
Socket outlet
Socket outlet of 1A current 250 Vca (max) handling capability is provided for the ease of testing, commissioning &
servicing of the UPS.
Page 7-4
In ECOMODE the load is not protected against mains distortion.
Liebert Hipulse E
WARNING
WARNING
(07/04)
User Manual
Single or '1+N' UPS System
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