Specifications

U-ENS00011_99AtypSMSSpec_Rev2.doc

U-ENS00011 Rev2 12/9/08

H. Output Overload Capability

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

rated output voltage (and voltage regulation) to:

105% to 125% for 2 minute duration.

126% to 150% for 1 minute duration.

The UPS Module Operation/Display panel LED indication will i lluminate 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 230% 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 da mage due to excessive

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

J. Inverter Output Isolate

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

2.2.3 UPS Module Control and Monitoring

A. UPS Module Control and Monitoring operates and controls the converter , inverter and

independent automatic bypass static switch circuit

B. The UPS Module control circuitry utilizes Digital Signal Processor (DSP) and Application

Specified IC (ASIC) which create advanced controllability and simplify the control circuit.

Direct Digital Control (DDC) utilizing DSP and ASIC ensures high reliability, as w ell as

superior functionality and performance.

C. All UPS Module Control and Monitoring printed circuit boards shall be effectively sealed

to protect against corrosiv e vapors.

D. The UPS Module Control power supply employs a redundant design configuration,

utilizing the UPS AC input (utility), Bypass input and the UPS Module inverter output

therefore enhancing reliability.

2.2.4 Bypass and St atic Switch

UPS module contains an automatic bypass static switch circuit and associated bypass

static switch transfer control circuitry.

A. General

A bypass circuit shall be provided as an alternate source of power other than the inverter.

A high speed Thyristor switch and wrap-around contactor shall be used to assume the

critical load during automatic transfers to the bypass circuit. The static switch and