Specifications

98AEtypSMSspec_RevC.doc

SP-0012 Rev. C 09/05/09

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.

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.

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

occur and be displayed if battery abnormalities are detected.

2.2.1.3 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.