Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

b. Inverter DC input varies from maximum to minimum.

c. Environmental condition variations within the specifications defined

herein.

G. Output Harmonic Distortion

The inverter output shall limit the amount of harmonic content to 2% maximum

at 100% linear load, and 5% maximum at 100% non-linear load. The need for

additional filtering to limit the harmonic content shall not be required. Therefore

high efficiency, reliability and original equipment footprint are maintained.

H. Output Overload Capability

The inverter output shall be capable of providing an overload current while

maintaining rated output voltage (and voltage regulation) to:

1. 105% to 125% for 10 minute duration.

2. 126% to 150% for 1 minute duration.

The UPS Module Operation/Display panel LED indication will illuminate to

identify an overload condition. If the time limit associated with the overload

condition expires or the overload is in excess of the set current, the load power

shall be transferred to the bypass source without interruption.

I. Inverter Current Limit

The inverter output current shall be limited to 212% of rated load current. Two

current transformers in separate locations on the output (and operating

separately offering redundancy) shall be employed as means of current

sensing.

The inverter current limit protects inverter components from damage due to

excessive over-current (Excessive load, faults and reverse current)

J. Inverter Overload Protection

The inverter output shall utilize the electronic inverter current limiting for

protection against overload conditions (excessive overload, faults). The

inverter shall utilize a contactor to isolate its output from the critical bus and the

load transferred to the bypass source. The bypass static switch circuit shall be

sized to provide fault clearing. The inverter output isolation contactor shall be

located internal to the UPS module and shall be controlled by the internal UPS

Module control.

The DC input to the Inverter shall utilize fuses for overload protection. Inverter

fuses shall be fast acting semiconductor type to clear faults on the DC link.

K. Inverter Output Isolate

The inverter output contactor isolates the inverter from the load and bypass

source.

L. Line Drop Compensation

The inverter shall be provided with circuitry such that its output voltage rises

linearly with output current. The rise shall be required to achieve this function,

and it shall not interfere with other requirements of this specification. The