Specifications

a. Converter input current (maximum) 110% of nominal

b. Converter input current (aux.) 25%-100% variable

4.1.3 Battery Charge Current Limit

The Converter logic shall provide DC battery current limiting for controlled

battery charging. The battery current sensing shall be independent of the

Converter DC output current sensing to provide precise battery recharging. The

following battery current limits shall be provided as a minimum:

a. Battery charge current limit 10% to 50% (adjustable) of battery Ah rate.

4.1.4 Voltage Regulation

The Converter output voltage shall not deviate by more than ± 1% RMS due to

the following conditions:

a. From 0 to 100% loading

b. Converter input variations of voltage and frequency within the limitations

set in section 3.2.

c. Environmental condition variations within the limitations set in section 3.5.

4.1.5 Reflected Harmonic Content

The Converter shall not produce more than a maximum of 3% reflected current

distortion into the Converter input utility source when nominal voltage and rated

load is applied. Typically, the amount of reflected current distortion shall not

exceed 5% THD at 50 % load.

4.1.6 Automatic Input Walk-in

The Converter logic shall employ circuitry to allow a delayed and timed ramping

of input current. Subsequent to energizing the Converter input, the ramping of

current shall be delayed by a maximum of 3 seconds. Upon starting the walk-in

process, the ramping of current shall be timed to assume the load gradually within

1 through 30 seconds (every 1 second selectable). This function shall be supplied

as standard equipment.

4.1.7 Input Overload Protection

The 100 to 225 kVA units shall include wrong sequencing protection.

4.1.8 Equalize Charge Timer

The UPS logic shall provide a 24 hour electronic automatic equalize charge timer.

The timer circuit, once activated, shall provide a high rate equalizing charge

voltage to the system battery for the selected time. The circuit shall also be

capable of manual activation via the control-panel mounted push button and de-