Document Outline

• 1.0 System Description
  • 1.1 Function
  • 1.2 System Flexibility
  • 1.3 Inter-System Isolation and Reliability
    • Figure 1 Basic Dual-Bus PowerTie one-line diagram
    • Figure 2 PowerTie systems - fault isolation issues
    • Figure 3 PowerTie systems - control interface diagram
  • 1.4 Control System Features
    • Digital Controls
    • Digital Phase Lock of Uninterruptible Power Module (UPM) Inverters
    • System Output Voltage Control
    • Module Load Sharing
  • 1.5 Operational Description
    • 1.5.1 Operational Choices
    • 1.5.2 Momentary Tie Operation
      • Intersystem Synchronizing
      • Momentary Tie Transfer Controls
    • 1.5.3 Continuous Tie
      • Intersystem Sync and Power Sharing
      • Continuous Tie/Transfer/Parallel Control
    • 1.5.4 Tie System Components
    • 1.5.5 Modes of Operation
      • Figure 4 PowerTie system one-line diagram
• 2.0 Operation Description
  • 2.1 Continuous PowerTie
    • Selecting a Line Sync Source
    • Synchronizing the UPS Systems
    • Checking for Phase, Voltage, and Capacity
    • OK to Tie UPS Systems
      • Figure 5 Control panel layout
  • 2.2 Separating Tied Systems
    • Synchronize Systems
    • Verifying Capacity
    • OK to Open Tie
  • 2.3 Load Transfers Between UPS Systems
    • Selecting a System for Transfer
    • Synchronizing to the Bypass Source
    • Checking for Phase, Voltage, and Capacity
    • Transferring the Load
    • Transfer Complete
  • 2.4 Combined Loads on One System from Continuous Tie Operation
  • 2.5 Combined Loads on One System to Continuous Tie Operation
  • 2.6 Design Criteria
    • Isolation and Fault Tolerance
    • Load Share Signal
    • System Voltage Control Signal
    • Line Sync Signal
      • Figure 6 PowerTie system - fault isolation issues
      • Figure 7 PowerTie systems - fault tolerance
  • 2.7 Improper User Operation
    • Transfer Operation
    • Tie Operation
  • 2.8 Tie Circuit Breaker or Logic Faults
    • 2.8.1 What Happens If a Failure Occurs During a Power Transfer
    • 2.8.2 What Happens If a Logic Failure Occurs During Power Transfer
    • 2.8.3 Hardware Failures
  • 2.9 Recommendations - Tie Circuit Breaker Selection
• 3.0 Control Panel Description
  • 3.1 Mimic Panel
    • UPS System 1 - Primary Bypass
    • UPS System 2 - Primary Bypass
    • UPS System 1 - On Bypass
    • UPS System 2 - On Bypass
    • Load 1 Circuit Breaker
    • Load 2 Circuit Breaker
    • Tie Circuit Breaker
    • Load 1 - Normal
    • Load 1 - On System 2
    • Load 1 - Systems Tied
    • Load 1 - Off
    • Load 2 - Normal
    • Load 2 - On System 1
    • Load 2 - Systems Tied
    • Load 2 - Off
    • Control Status - Synchronizing
    • Control Status - Transferring
  • 3.2 Load Transfer Controls
    • OK to Transfer Load 1 to System 1
    • OK to Transfer Load 1 to System 2
    • OK to Transfer Load 2 to System 1
    • OK to Transfer Load 2 to System 2
    • Transfer Control Disabled
    • Transfer Function Available
    • Transfer Function Available - OK to Transfer Load 1 to System 1
    • Transfer Function Available - OK to Transfer Load 1 to System 2
    • Transfer Function Available - OK to Transfer Load 2 to System 1
    • Transfer Function Available - OK to Transfer Load 2 to System 1
    • Transfer Load To - System 1
    • Transfer Load To - System 2
    • Push to Transfer After OK
  • 3.3 Continuous Tie Control
    • OK to Tie Systems
    • OK to Open Tie
    • Tie Control Disabled
    • Primary Bypass Select
    • Synchronize Systems
    • Push to Tie Systems After OK
    • Push to Open Tie After OK
  • 3.4 Control Inhibits
    • Phase Lockout
    • Voltage Lockout
    • Load Lockout
    • Logic Failure
    • Lamp Test
  • 3.5 Manual Controls
    • Close Load 1
    • Close Load 2
    • Trip Load 1
    • Trip Load 2
    • Trip Tie
• 4.0 Operating Instructions
  • 4.1 Initial System Start-Up
  • 4.2 Basic Operation
    • 4.2.1 Momentary Tie - Load Transfers
    • 4.2.2 Normal Transfer Operation Configurations
    • 4.2.3 Maintenance Procedures - Isolating Each UPS System
    • 4.2.4 Isolating a UPS System for Maintenance - Combined Loads Operation
    • 4.2.5 Transfer of Load Between Two Systems
    • 4.2.6 Returning an Isolated System to Normal Operation - End Combined Loads Operation
    • 4.2.7 Maintenance Procedures - Maintaining PowerTie Components
    • 4.2.8 Maintenance Procedures - Tie Control Logic Components
    • 4.2.9 Abnormal Operations
    • 4.2.10 Trouble Recovery
    • 4.2.11 Continuous Tie-Systems
      • Normal Operating Configuration
      • Tying the UPS Systems - Continuous Parallel Operations
      • Returning Parallel Systems to Normal Operation - End Continuous Tie
      • Maintenance Procedures - Tie Control Logic and Power Components
      • Abnormal Operations
      • Trouble Recovery
    • 4.2.12 Isolation for Maintenance
      • Figure 8 PowerTie system one-line diagram
    • 4.2.13 Operation Scenarios/Transfer Procedures
      • Figure 9 From start-up to normal operation, loads to be split between two distribution feeders
      • Figure 10 From combined loads operation to loads split between two feeders
      • Figure 11 From continuous tied systems to loads split between two systems
      • Figure 12 Transfer both load feeders to one UPS
      • Figure 13 Both feeders on one system to normal operation
      • Figure 14 Transfer 100% load on one system to 100% load on a second system (a two-step operation)
      • Figure 15 Normal split load operations to Continuous Tie
      • Figure 16 Continuous Tie to normal split load operation
      • Figure 17 Continuous Tie to load on one system
      • Figure 18 Load on one system to Continuous Tie
      • Figure 19 One system in bypass to both feeders combined on remaining operational system
      • Figure 20 One system in bypass to Continuous Tie operation (Option 1)
      • Figure 21 One system in bypass to Continuous Tie operation (Option 2)