EXS
User Manual 10H52260UM60 - Rev. 1 - 10/2017
13
Parallel System Features
1. The hardware and software of a parallel system are identical to those of the individual modules. The parallel
system is configured by modifying the respective settings in the configuration software or via the control panel.
2. Parallel cables are connected in a ring, providing both system reliability and redundancy. LBS cables are
connected between any two UPS modules of each bus. The intelligent parallel logic provides the user with maximum
flexibility. For example, the UPS modules in a parallel system can be shut down or started up in any order. Transfers
between normal mode and bypass mode of operation are seamless and self-recoverable, i.e, when the overload is
cleared the system will revert automatically to its original operating mode.
3. The total load of the parallel system can be queried from the LCD screen on each UPS module.
Parallel System Requirements
A group of paralleled modules behave as if it were one large UPS with the advantage of providing increased
reliability. To ensure that all modules are utilised equally and to comply with relevant wiring rules, the following
requirements apply:
1. All UPS modules must be of the same rating and must be connected to the same bypass source.
2. The bypass and rectifier input sources must be connected to the same neutral line input terminal.
3. If any RCD devices are installed they must be set-up appropriately and located upstream of the common neutral
line input terminal. Alternatively, the device must monitor the protective earth current of the system. Refer to
Warning: high earth leakage current
before
Contents
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1.4
Operating Modes
The UPS features the following operating modes:
Normal mode
Battery mode
Bypass mode
Maintenance mode
ECO mode
Parallel redundancy mode (system expansion)
LBS system mode
Common battery string mode
Normal mode
As shown in Figure 1-3, the mains is rectified by the UPS rectifier and then inverted by the inverter to supply
uninterrupted AC power to the loads. At the same time, the charger will charge the battery.
Figure 1-3 Normal operating mode line diagram
Rectifier input switch
Mains input
Battery charger
Output switch
Inverter
Rectifier
UPS output
Battery
Automatic inverter switch
