
2.2
COMPONENTS
2.2.1
InputConverter
2.2.1.1 General
Incoming mains power shall be converted to regulated DC power by the input converter for supplying DC power
to the inverter. The input converter shall provide input power factor correction (PFC) and input current distortion
reduction.
2.2.1.2 Input Current Limit
The input shall use the power necessary to operate the load attached to the output before going to batteries. The
UPS shall not use electronic input current limiting.
•
The GXT4-10000RT230 shall include a 1-pole, 63Ainput circuit breaker.
2.2.1.3 Input Protection
The UPS shall have built-in protection against over current and overvoltage conditions including low-energy
lightning surges, introduced on the primary input source. The UPS shall sustain input surges without damage per
criteria listed in 61000-4-5 Surges/Lightning.
2.2.1.4 Battery Recharge
The UPS shall contain a three-stage battery charger designed to prolong battery life. The battery shall be constant
current charged to restore capacity, then shall be constant voltage charged to maintain the battery in a fully
charged state. Recharge time for the internal battery shall be 3 hours maximumto 90% capacity (full load
discharge rate). There shall be DC overvoltage protection so that if the DC voltage exceeds the pre-set limit, the
inverter shall shut down automatically and the critical load shall be transferred to internal bypass.
2.2.2
Inverters
2.2.2.1 General
The UPS inverters shall be of a pulse-width-modulated (PWM), IGBT design capable of providing the specified
mains output. The inverters shall convert DC power from the input rectifier output or the battery into precise
sine wave mains power for supporting the critical load.
2.2.2.2 Overload
The inverter shall be capable of supplying current and voltage for overloads exceeding 100%, and 105-130% for
1 minute, 131-150% for 10 seconds, 151 - 200% for 1 second, and up to >200% for 5 cycles of full load current.
A visual indicator and audible alarm shall indicate overload operation. For greater currents or longer time
duration, the inverter shall have electronic current-limiting protection on the output to prevent damage to
components. The inverter shall be self-protecting against any magnitude of connected output overload. Inverter
control logic shall sense and disconnect the inverter from the critical AC load without the requirement to clear
protective devices.
2.2.2.3 Inverter DC Protection
The inverter shall be protected by the following DC shutdown levels:
•
DC Overvoltage Shutdown
•
DC Under voltage Shutdown (End of Discharge)
2.2.2.4 Output Frequency
An oscillator shall control the output frequency of the UPS. The inverter shall maintain the output frequency to
±0.1Hz of nominal frequency during Battery mode, Frequency Converter mode or when otherwise not
synchronized to the mains source.
SLI-23197_Rev 1 8Guide Specifications