Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

2.2.2. Charger/Booster

A. The charger/booster utilizes solid state Pulse Width Modulation (PWM)

controlled Insulated Gate Bipolar Transistors (IGBT). The charger switching

frequency is 10kHz, and the booster switching frequency 2kHz.

B. The Battery Charge Current charger logic and control circuit DC battery

current limiting function enables controlled battery charging. The battery

charge current limit will control the recharge current by reducing the

rectifier/charger output when the set limit is reached. The following battery

current limit shall be provided as a minimum:

1. Battery charge current limit: 10% of battery Ah rate.

2. Maximum charge current: 13% of UPS rated kVA.

(e.g. 13ADC maximum of 100kVA UPS)

C. Equalize Charge Timer: UPS Module logic and control shall provide an

electronic equalize charge timer function (0 to 50 hour selectable - default

twenty-four (24) hour). Once activated the timer circuit shall provide a high rate

equalizing charge voltage to the system battery for the selected time. The

function can be manually activated and de-activated via the UPS Module LCD.

The level of equalizing voltage shall be equal to that stated by the battery

manufacturer (typically 0.04 to 0.08 VDC/cell higher than the specified float

level). Upon completion of the timer count, the converter output voltage shall

return to the specified float voltage (typically 2.25 to 2.27 VDC/cell). An Auto

Equalize charge operation is also provided following AC input restoration and

subsequent to the power walk in function. This equalizing charge will occur

until the battery target voltage is reached (condition is met to end equalizing

charge), in which float voltage will be applied.

D. Battery Temperature Compensation; The UPS shall have as standard a battery

temperature compensation function allowing the rectifier voltage to fold-back

to a safe value in the event the battery system temperature reaches a pre

determined (dangerous) level. Initiation will be by dry contact input from

thermocouple sensor (User supplied)

E. DC Input protection: The DC input circuit shall be protected by a DC circuit

breaker. The DC circuit breaker allows complete interruption of DC current and

isolation of the UPS Module DC input and the battery system. The DC Circuit

breaker shall incorporate an UVT relay and auxiliary contact connections to the

UPS Module control for prevention of incorrect start up and shutdown

sequencing. The DC Circuit Breaker shall be provided as standard equipment.

F. Charger/Booster protection: The DC input to the Charger/Booster shall utilize

fuses for overload protection. The fuses shall be fast acting semiconductor

type to clear faults on the DC link.

G. Ripple voltage; The DC (battery) bus RMS ripple voltage shall be less than 2%

of the UPS nominal DC voltage level at 100% load. This shall provide for

maximum battery life.