Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

2.3.2. SMB and 52L circuit breaker and associated power circuits

The CLC contains power circuit. The system bypass source is a common feed to

the UPS Module bypass inputs and also the CLC System Maintenance Bypass

input. An electro-mechanical interlock system will prevent closure of the SMB

circuit breaker and subsequent opening of 52L circuit breaker unless UPS MMS

Bypass Operation is active. Refer to previous section System Maintenance

Bypass Operation.

System Maintenance Bypass Operation shall allow total system repair and testing

for parallel operation as well as individual UPS Module repair and testing without

affecting load operation as standard a System Maintenance Bypass circuit breaker

(SMB) and power circuit, and a System Output circuit breaker (52L) and output

A. SMB/52L Interlock System:

An electro-mechanical interlock system will be included as standard. The

Interlocking System shall be used for controlling initiation of System

Maintenance Bypass Operation and offer the following safety functions:

B. Interlock Principle:

To prevent the closure of System Maintenance Bypass Circuit Breaker SMB

while the system is operating on UPS Inverter mode. (Possible connection of

out of phase sources).

To force sequence of operation to isolate UPS MMS (UPS Modules) from

System Maintenance Bypass power supply for maintenance and testing

requirements.

2.3.3. CLC Monitoring Section

A. The Monitoring System main Graphical Operator Terminal (GOT) shall be the

Monitoring System Human Machine Interface (HMI) and shall be located on

the CLC door exterior. All information will be displayed and operator control

sequences initiated from the HMI. The GOT will be directly interfaced to each

UPS Module LCD via Ethernet (10Base-T and Hub) and will have access to all

system UPS Module data via this network. The GOT will be serial connected to

the Monitoring System PLC.

B. The PLC performs logic functions required for the HMI screen display

requirements and also for performing operator sequences. The PLC inputs will

also accept the CLC circuit breaker status contacts for HMI display information.

The PLC outputs shall be utilized for system summary alarm and user

selectable system output alarms (selectable from the HMI). GOT software (for

HMI screen display information and touch screen functions), and the PLC

ladder sequence control program will create the Monitoring System user

environment and operational architecture. UPS MMS configuration, UPS

Module and UPS quantity will be selectable for HMI display information.

C. The HMI (GOT) displays different screen information according to user request.

Typical information screens are:

1. Main Overview:

a. Total UPS MMS mimic display and power flow.