Mitsubishi 9800A Series Specifications download pdf (Page 11)

the specified float level). Upon completion of the timer count, the Rectifier

output voltage shall return to the specified float voltage (typically 2.25 to 2.28

VDC/cell).

4.2.4. Battery Temperature Compensation

The UPS shall have, as standard equipment, a battery temperature

compensation function allowing the rectifier voltage to fold-back to a safe

value in the event the battery temperature reaches a pre determined dangerous

level.

4.2.5. DC Breaker

The DC input shall be protected by a DC Breaker that shall also include

circuitry to prevent wrong sequencing during startup or shutdown of the UPS

system. The DC Breaker shall be provided as standard equipment.

4.2.6. Ripple voltage

The DC(battery) buss rms ripple voltage shall be less than 1% of the UPS’

nominal DC voltage level at 100% load. This shall provide for maximum

battery life.

4.3. Inverter

4.3.1. General

The Inverter shall generate AC power that is derived from DC power

supplied from the Rectifier or the system battery. The Inverter shall be

capable of providing rated output as stated in section 3.4 while operating

from any DC voltage within the battery operating range. The Inverter shall

utilize the following technologies:

a. Solid state PWM controlled IGBT power transistors switching at 10

kHz. Switching shall be defined as IGBT turn on and turn off rate.

Doubling of frequency at inverter output shall not be considered as the

true switching frequency.

b. DSP based control logic.

4.3.2. Voltage Regulation

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Mitsubishi 9800A Series Specifications Page 11