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Chapter 5 Operations
32 Shield M10U user manual
1. Optional isolation transformers are available for applications where sources do not share the same neutral
reference or where the neutral is not available.
2. Parallel system is available only for 6 power modules cabinet.
5.3 Operating Mode
The Modular UPS is an on-line, double-conversion, reverse-transfer UPS that permits operation in these modes:

Normal mode

Battery Mode

Auto-restart mode

Bypass mode

Maintenance mode (manual bypass)

Parallel redundancy mode(6 modules cabinet)

ECO Mode
5.3.1 Normal Mode
The UPS inverter power modules continuously supplies the critical AC load. The rectifier/charger derives power from the
AC mains input source and supplies DC power to the inverter while simultaneously FLOAT or BOOST charging its
associated backup battery.
5.3.2 Battery Mode
Upon failure of the AC mains input power; the inverter power modules, which obtains power from the battery, supplies
the critical AC load. There is no interruption in power to the critical load upon failure. After restoration of the AC mains
input power, the “Normal Mode” operation will continue automatically without the necessity of user intervention.
5.3.3 Auto-Restart Mode
The battery may become exhausted following an extended AC mains failure. The inverter shuts down when the battery
reaches the End of Discharge voltage (EOD). The UPS may be programmed to “Auto Recovery after EOD” after a delay
time if the AC mains recovers. This mode and any delay time are programmed by the commissioning engineer.
5.3.4 Bypass Mode
If the inverter overload capacity is exceeded under normal mode, or if the inverter becomes unavailable for any reason,
the static transfer switch will perform a transfer of the load from the inverter to the bypass source, with no interruption
in power to the critical AC load. Should the inverter be asynchronous with the bypass, the static switch will perform a
transfer of the load from the inverter to the bypass with power interruption to the load. This is to avoid large cross
currents due to the paralleling of unsynchronized AC sources. This interruption is programmable but typically set to be
less than 3/4 of an electrical cycle, e.g., less than 15ms (50Hz) or less than 12.5ms (60Hz).
5.3.5 Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load when the UPS becomes unavailable
e.g. during a maintenance procedure.
5.3.6 Parallel Redundancy Mode (System Expansion)
For higher capacity or higher reliability or both, the outputs of several UPS modules can be programmed for direct
parallel while a built-in parallel controller in each UPS ensures automatic load sharing.
5.3.7 Eco Mode
To improve system efficiency, UPS rack system works in bypass mode at normal time, and inverter is standby. When utility
fails, UPS transfer to battery mode, and inverter power the loads. The efficiency of ECO system can be up to 98%.
NOTE: There is a short interruption time (lower than 10ms) when transfer from ECO mode to battery mode, it must be
sure that the time has no effect on loads.