Specifications

98AEtypSMSspec_RevC.doc

SP-0012 Rev. C 09/05/09

Input current limit setting: 110% of nominal rated current.

The AC input current limit shall be set up so that the rectifier/charger can provide

sufficient capacity to the inverter at rated load and have the capability to recharge a

discharged battery.

The input current limit protects hybrid converter components from damage due to

excessive input current.

2.2.1.4 Input Power Demand

The rectifier and booster logic and control shall also be capable of providing auxiliary

current limiting when initiated by an external dry contact closure (e.g. in the event power

demand is required when the UPS is fed from a motor generator).

Power Demand: Adjustable, maximum 103% of nominal rated current.

2.2.2 Inverter

A. General

The inverter shall generate AC power derived from DC power supplied from the rectifier

or system battery. The inverter shall be capable of providing rated output as specified

while operating from any DC voltage within the battery operating range. The inverter

shall utilize the following technology:

1. Solid state PWM controlled IGBT power transistors switching at 2 kHz (average

switching frequency). Utilizing the adoption of a unique Mitsubishi Electric

Modulation method, enabling improved switching frequency (for efficiency

improvement) and high-speed response. Switching shall be defined as IGBT turn

on and turn off rate. (Apparent doubling of frequency at inverter output due to

simultaneous IGBT device activation shall not be considered as the true switching

frequency.)

2. UPS Module Full Direct Digital Control (DDC) Adoption:

a. Field Programmable Gate Array (FPGA) Control

b. DSP based Control

c. DSP Sampling Frequency is 30 kHz, therefore the control samples 500 times

in 1 cycle of output voltage. Output voltage is controlled with high precision.

B. Voltage Regulation

The inverter output voltage shall not deviate by more than +/- 1% RMS with the following

steady state conditions:

1. 0 to 100% loading.

2. Inverter DC input varies from maximum to minimum.

3. Environmental condition variations within the specifications defined herein.

C. Voltage Adjustments

The inverter shall have the ability to manually control and adjust the output voltage to