The Series 1200 UPS Parallel System is used to prevent the following effects:
- Loss of critical electronic information
- Minimal outages for equipment
- Minimal adverse effect on production of equipment due to unexpected power problems
The Series 1200 UPS Parallel System also provides the following advanced power conditioning features: voltage regulation and harmonic cancellation.
The UPS Parallel System configuration consists of the following connected components: Parallel Control Cabinet, multiple MMU and Switchgear.
Note: The Switchgear is commonly designed as custom for application. Thus, the Switchgear is referred to as optional equipment in this publication.
The Multiple Module Units (MMUs) are a UPS 1200 that is designed with paralleling capability. The MMUs consist of multiple section cabinets that make up a stand alone UPS. The stand alone system consists of several connected cabinets that depending on the configuration may contain the following cabinets: Input/Output Cabinet, Static Switch Cabinet, Controls Cabinet, Inverter Cabinet, Flywheel Cabinets, MMU with DSB Transformer Cabinet and MMU with DSB Output Cabinet.
The following cabinets are available options:
- Bottom Entry Cabinet
- Flywheel Cabinet, maximum of four
Overview of Operation
The Series 1200 UPS Parallel System is a fully integrated line interactive system that use spinning flywheels to store mechanical energy. During an interruption of utility power, the UPS converts mechanical energy into electrical energy. This energy is supplied to the external load until one of the following conditions occur:
- The emergency standby generator (if available) assumes the load
- The utility power is restored
- The flywheels run out of energy
Once utility power returns, the system transfers the load back to utility power without interruption. The system provides voltage regulation and protection from power outages.
Overview of PCC Component
PCC and Switchgear Components
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| Illustration 1 | g01320110 |
Overview of the Components for the 1200 UPS PCC | |
Refer to Illustration1 for the simplified circuit drawing of the components for the Series 1200 UPS Parallel Control Cabinet and Switchgear.
The major components and options are shown in the following list:
- Paralleling Cabinet Controller (PCC2)
- Paralleling Bus Output Breaker (PBO)
- Bypass Breaker (BYB)
- Static Switch Input Breaker (SSI)
- Parallel Bus Input Breaker (PIB) - one per MMU
- Maintenance Bypass Breaker (MBP)
- Maintenance Isolation Switch (MIS)
Paralleling Cabinet Controller 2
The PCC2 controls the paralleling switchgear. The PCC2 controls the following motor operated, stored energy type breakers: PBO and BYB. The PBO and the BYB are controlled as a transfer pair during transfers to the the bypass and from the bypass. The PCC2 determines if the output will be energized based on the following criteria:
- Upon power up
- Assuming the BYB and PBO are open
- Auto Load setting
- Start parameter setting
- MBP state
- Voltage levels of parallel bus and bypass input
Parallel Bus Output Breaker (PBO)
The PBO is a breaker in the paralleling switchgear. The PBO is located on the output of the parallel bus. The breaker is automatically operated by the PCC2. The breaker is used to connect the parallel bus to the load.
Static Switch Input Breaker (SSI) and Bypass Breaker (BYB)
The SSI acts quickly to connect the bypass to the load. For Switchgear configurations that have the SSI sized for short term load carrying, an optional BYB is added in parallel for long term load carrying. The SSI and optional BYB are automatically operated by the PCC2.
Parallel Bus Input Breaker (PIB)
The PIB is used to locate an MMU from the load. The breakers are manually operated.
Maintenance Bypass Breaker (MBP)
The MBP is a motor operated, stored energy breaker. The breaker is controlled by the Maintenance Bypass Controller 2 (MBC2) in order to transfer the system to and from maintenance bypass. The MBP works as a transfer pair with the MIS.
Maintenance Isolation Switch (MIS)
The maintenance isolation switch os one of the breakers that make up the optional maintenance bypass breaker pair. The MIS is located between the common output of the following components: BYB, PBO and load bus. The system records messages that refer to these components. The system displays messages that refer to the operating state of the components.
Overview of MMU Components
MMU with Distributed Static Bypass (DSB) Components
Refer to Illustration 2 for the configuration of an MMU with a DSB.
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| Illustration 2 | g01322104 |
Component Overview of MMU with DSB Parallel System | |
Cabinet location of an MMU with DSB system components are shown in the following list:
- Input Circuit Breaker (K1) - I/O Cabinet
- Bypass Static Switch - Static Switch Cabinet
- Line Static Switch - Static Switch Cabinet
- Line Inductor - Static Switch Cabinet
- Inverter 1 Contactor (K3) - Controls Cabinet
- Inverter 2 Contactor (K4) - Controls Cabinet
- Filter Inductors - Controls Cabinet
- Utility Inverter 1 - Inverter Cabinet
- Utility Inverter 2 - Inverter Cabinet
- Transformer Cabinet with Delta/ZigZag transformer
- Output Cabinet with MMU with DSB Output Breaker (K8)
Each Flywheel Cabinet contains the following components:
- DC Disconnect Switch
- Flywheel A Inverter
- Flywheel B Inverter
- Flywheel A
- Flywheel B
Note: The DC Bus is common to the Inverter Cabinet and all the Flywheel Cabinets that make up the MMU. The DC Bus is located in the wireway above the Inverter Cabinet and the Flywheel Cabinets. Each Flywheel Cabinet has a manually operated internal DC disconnect switch. The switch is used to isolate the Flywheel Cabinet from the rest of the system. When the Flywheel Cabinet is being serviced, the Flywheel Cabinet must be isolated for reasons of safety.