Specifications

98AEtypMMSspec_RevB.doc

SP-0011 Rev. B 9/5/09

2. Bypass Circuit Load Sharing Reactors (if required) ACL1, ACL2 up to ACL8

depending on system UPS Module quantity.

3. Parallel bus power circuit.

4. Neutral Bar (if required).

5. Load bank test circuit (Option)

6. System Maintenance Bypass circuit breaker (SMB) and power circuit.

7. System Output circuit breaker (52L).

8. System output power circuit and terminals.

9. SMB, 52L Interlock System.

10. Interface terminal for CLC circuit breaker status.

B. CLC Monitoring Section

The Monitoring Section shall be located in a separate enclosure to the Power

Section. The Monitoring Section incorporates a Monitoring System that consists of

the following:

1. Main Graphic Operator Terminal (GOT)

2. Programmable Logic Controller (PLC).

3. Ethernet Hub (N Port depending on system UPS quantity).

4. GOT screen display software.

5. System Emergency Power off (System EPO) push button that will shutdown all

system UPS Modules. The CLC System EPO contacts will be hard wired to

each system UPS Module external signal terminal block (Input terminal –

Remote EPO).

1.4. UPS MMS OPERATION

The UPS shall be designed to operate continuously at rated capacity as an on-line,

automatic reverse transfer system and will supply uninterruptible power to the critical load in

the following modes;

A. Normal - The inverter continuously supplies AC power to the critical load. The rectifier

converts a utility AC power source to regulated DC power which then serves as the

inverter input and, simultaneously, as a float charge input to the storage battery.

B. Emergency - In the event of a utility AC power failure, UPS Module inverter input is

derived from the system batteries, therefore providing uninterrupted power to the critical

load. This transition occurs with no interruption of power to the critical load from either

failure or the restoration of utility AC power.

C. Recovery Charge - Subsequent to restoration of utility AC power and prior to the system

battery final voltage, each UPS Module hybrid converter (rectifier and charger/booster)

automatically reactivates and provides DC power to the inverter, simultaneously

recharging the system battery. This occurs automatically and without interruption to the

critical load.

D. Normal, Emergency and Recovery Charge Parallel Operation - UPS MMS Control,

incorporating 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 Instantaneous

UPS MMS Parallel Operation Control ensures that at all times the load is shared equally

between the UPS Module inverters and that the inverter outputs are synchronized.

E. UPS-MMS Bypass Operation - Each UPS Module contains an independent automatic