Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

H. Battery Self Test (Diamond-Sense); for a short duration, a small power

discharge from the battery is automatically performed. The UPS module, from

this small power discharge, evaluates the degradation of the system battery.

The following advantages are achieved:

1. The Diamond-Sense Battery Self-Test function can be performed even

when load is on inverter.

2. Due to the short duration small power discharge, there is no effect to

battery life expectancy.

3. The small power discharge has negligible effect on the overall battery back

up time. The small power that is discharged by the battery will quickly be

replenished.

4. The Battery Self Test will automatically occur every 720 hour interval. An

event alarm will occur and be displayed if battery abnormalities are

detected.

I. Input Current Limit

The rectifier and booster logic and control shall provide an input current limiting

function that limits AC input current. Two current transformers in separate

locations on the output (and operating separately offering redundancy) shall be

employed as means of current sensing.

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

b. 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.

c. The input current limit protects hybrid converter components from

damage due to excessive input current.

J. 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.

2.2.3. Inverter

A. 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: