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Liebert Series 610 4.2.9 Abnormal Operations, 4.2.10 Trouble Recovery

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Operating Instructions

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4.2.9 Abnormal Operations

Improper Transfer

Transfers can not be performed unless the OK TO TRANSFER LOAD (#) TO SYSTEM (#) light turns

on. This makes it difficult to begin an improper transfer.

The source feeding the UPS modules does not matter because the UPS inverter output is isolated

from the rectifier.

The logic permits transfers to and from a UPS system with the UPS modules running on Utility, Bat-

tery, or Engine-generator so long as the system accepting the load is running on inverter output.

Synchronization is verified by forcing the system to meet three independent criteria. First, all on-line

module oscillators must be synchronized. Second, the voltage zero crossings must be within tolerance.

Third, the instantaneous voltage differential between UPS system voltages must be within tolerance.

But, regardless of synchronization status, a critical load will not be allowed to transfer to a system

running on its bypass source. Transfers from a bypass source to a system on UPS is permitted.

Circuit Breaker Failure

If a “Close” or “Open” command to a circuit breaker fails to return a confirmation of completion within

an acceptable time period the Power-Tie logic initiates corrective actions based on the system’s initial

state and current state.

Loss of Tie Controls

Since UPS system independence has been stressed throughout the design of this Powe r-Tie configura-

tion, complete loss of Tie Controls will not affect either UPS system operating in any Momentary Tie

(Combined Loads Mode) configuration.

4.2.10 Trouble Recovery

While failures are extremely unlikely, the Power-Tie system has been designed to restart from any

system operating mode once the fault has been corrected. Refer to 1.5.5- Modes of Operation for a

description of the operating modes.

Contents

Main C ONTINUOUS P OWER -T IE C Page TABLE OF CONTENTS FIGURES 1.0 SYSTEM DESCRIPTION 1.1 Function 1.2 System Flexibility 1.3 Inter-System Isolation and Reliability Page Page Page 1.4 Control System Features Digital Controls Digital Phase Lock of Uninterruptible Power Module (UPM) Inverters System Output Voltage Control Module Load Sharing 1.5.2 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 Page 2.0 OPERATION DESCRIPTION 2.1 Continuous Power-Tie Selecting a Line Sync Source Synchronizing the UPS Systems Checking for Phase, Voltage, and Capacity Page 2.2 Separating Tied Systems Synchronize Systems Verifying Capacity OK to Open Tie 2.3 Load Transfers Between UPS Systems 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 Line Sync Signal Page Page 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 3.2 Load Transfer Controls Page 3.3 Continuous Tie Control 3.4 Control Inhibits 3.5 Manual Controls 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 4.2.4 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 Power-Tie 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 Page 4.2.13 Operation Scenarios/Transfer Procedures See 4.1 - Initial System Start-Up. Figure 11 From continuous tied systems to loads split between two systems Figure 10 From combined loads operation to loads split between two feeders See 4.2.6 - Returning an Isolated System to Normal Operation - End Combined Loads Operation. 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) See 4.2.4 - Isolating a UPS System for Maintenance - Combined Loads Operation. See 4.2.6 - Returning an Isolated System to Normal Operation - End Combined Loads 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 See 4.2.11 - Tying the UPS Systems - Continuous Parallel Operations. See 4.2.11 - Returning Parallel Systems to Normal Operation - End Continuous Tie. Figure 18 Load on one system to Continuous Tie Figure 19 One system in bypass to both feeders combined on remaining operational system See 4.2.11 - Tying the UPS Systems - Continuous Parallel Operations. See 4.2.3 - Maintenance Procedures - Isolating Each UPS 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) Page Page The Company Behind the Products Technical Support/Service Locations POWER AVAILABILITY C ONTINUOUS P OWER -T IE C U SER M