Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

providing load power from bypass source supply.

a. For bypass operation details, refer to previous section UPS MMS

Bypass Operation.

B. UPS MMS Parallel Operation Control

1. UPS MMS Parallel Operation Control in each UPS Module utilizes cross

current control signals between the UPS Modules to calculate and perform

fast simultaneous inverter reference voltage and phase waveform control.

This UPS MMS Parallel Operation Control ensures that at all times:

a. Instantaneous equal load sharing between UPS Module inverters is

achieved (Less than +/-5% of UPS Module rated current).

b. UPS Module inverter outputs are always synchronized. Refer to

previous section Inverter Frequency Control.

2. For parallel UPS Module inverter operation details, refer to previous

section UPS MMS Inverter Operation.

3. Independent UPS Module MMS Control enhances system reliability and

eliminates single points of failure associated with common control circuits.

4. All UPS Module MMS Control printed circuit boards shall be hermetically

sealed to protect against corrosive vapors.

2.2.7. Operation/Display Panel incorporates

A. Graphic Operator Terminal Liquid Crystal Display (LCD):

a. 5.7 inch Monochrome touch screen

b. High communication capability:

c. Ethernet (10Base-T) (utilized for Monitoring System interface).

d. Optional Expansion Bus Interface for field network connectivity

available (Profibus, DeviceNet etc.)

1. The LCD touch screen interfaces with the UPS Module Control and main

processor board to provide menu-driven operator instructions and UPS

Module operation details. The LCD indicates system operation, operational

guidance, and measurement data, set up data and alarm messages and

logs. All metering shall be digitally displayed on the LCD having an

accuracy of 1% or better.

2. The touch screen area is composed of four MENU sheets: MAIN,

MEASUREMENT, SET-UP and LOG. Each MENU sheet has a name tab at

the top and the four name tabs form an overlap index at the top of the

screen area. Touching the name tab of any of the MENU sheets at this

index will make that specific MENU be displayed. Each MENU sheet

displays specific information and includes touch icons that perform MENU

related functions

(1) LCD MAIN MENU Sheet:

MAIN MENU Sheet: The MAIN MENU indicates power flow and