Table of Contents Table of Contents Introduction Electrical Installation 2 - 8 • An important note on safety Voltage and frequency ratings • External supply wiring - the fan and control power source • Connectors Chapter One - Introducing ASCO Load Banks •...
Table of Contents Chapter Five - Maintenance & Troubleshooting Safety Warning 5 - 2 Introduction Routine Maintenance Procedures 5 - 3 This manual should provide you with all the information that you need to safely setup and operate • ASCO Sigma LT load banks. Daily (before each use) •...
An Important Note on Safety All ASCO load banks are designed with safety as a very high priority, but their operation does present Chapter One some risks. In common with other test equipment, the safety of all concerned is dependent on the way that the unit is operated.
Page 6
Chapter One Introducing ASCO Load Banks Why is Power Supply Testing Required? How Do Load Banks Work? There are many different ways of generating electrical power and many reasons why Load banks are complex precision engineered machines, but to explain the general generating equipment may be required.
Chapter One Introducing ASCO Load Banks Introducing ASCO Load Banks ASCO Load Bank Control Options ASCO load banks are purpose designed to provide all of the facilities needed to quickly, Reliable testing requires precise control of the load applied to the generator and accurate safely and reliably test generating equipment with outputs up to several megawatts.
Chapter One Introducing ASCO Load Banks Load Bank Applications Testing UPS systems and batteries The main application for a load bank is usually generator testing. However, load banks are Uninterruptable power supply systems consisting of a generating set combined with a set versatile devices and they have a number of useful applications that can be applicable of batteries are a common feature of data centres and other installations where maintaining including data centre Heating Ventilation Air Conditioning (HVAC) testing and UPS...
Chapter One Introducing ASCO Load Banks Using Multiple Load Banks Introducing ASCO’s Sigma LT load banks ASCO’s Sigma LT control system allows up to 25 load banks to be interconnected and Sigma LT load banks are resistive, portable and indoor load banks. Sigma LT load banks controlled from a hand-held as if they were a single unit.
Chapter One Sigma LT Load Bank Specifications Chapter Two 3010 3020 3040 Nominal capacity (kW) Load Bank Setup Standard rated voltage (V) Terminal qty / phase & size (mm) Single pole Single pole Three pole This chapter covers all of the procedures that need to be carried out before a ASCO Sigma LT load bank Length (mm) 1140 1410...
Chapter Two Load Bank Setup Using a ASCO Load Bank Safely • The discharge air from the load bank can cause serious burns. Keep away from the outlet grille while the load bank is running, and do not touch it for at least 10 minutes after the test is completed.
Chapter Two Load Bank Setup Transporting ASCO Load Banks Setting up ASCO Sigma LT Load Banks There are a number of factors that need to be considered before you select a load bank ASCO Sigma LT load banks will vary in weight depending on the model. Make sure you for a particular application.
Chapter Two Load Bank Setup Setup in a plant room Avoiding hot air re-circulation If the load bank is setup in a plant room you will need to pay particular attention to the To reduce the risk of hot air re-circulation place air inlets at low level and air outlets at high airflow requirements of the unit.
Chapter Two Load Bank Setup Electrical Installation External supply wiring - the fan and controls power source Refer to the load bank’s rating plate for the external power supply requirements. The The electrical installation for a load bank consists of making connections both for the supply must be capable of supplying the fan motor starting current, and must be fused Supply-on-Test and for an external supply that is used to power the load bank’s fans and accordingly.
Chapter Two Load Bank Setup Supply-on-Test wiring - general points The maximum permissible single-phase supply voltage for this connection is 100% of the 3-phase load bank rated voltage. • It is good practice to route the three phase conductors in a close tre-foil layout, held together with cable-ties.
Chapter Three Digital Toggle Switch Control Operation This chapter explains the local digital toggle switch operation of ASCO Sigma LT load banks. It describes the functions of the various buttons and displays. For troubleshooting and error message see chapter 5.
Digital toggle switch control operation Chapter Three Before Operating the Load Bank Turning the load bank on and off Ensure that: The load bank provides a method of quickly starting and shutting down the load bank: The Fan and Controls Supply Isolator. This is a two position switch which isolates the •...
Digital toggle switch control operation Chapter Three Introduction to Sigma LT Digital Toggle Switches Version ASCO METERING V/Hz/kW V x 3 MODE A x 3 Model The Sigma LT digital toggles are fitted as standard to all Sigma LT load banks. The control 5 kW 5 kW 10 kW...
Chapter Four Hand-Held Control Operation This chapter explains the optional hand-held operation of ASCO Sigma LT load banks. It describes the functions of the setup, buttons and displays. For digital toggle switch operation see chapter 3 and for troubleshooting and for error messages see chapter 5.
Chapter Four Hand-held control operation Introduction to the Sigma LT Hand-Held The Sigma LT hand-held is an optional method of control for networking load banks. Up See below for the list of symbols that will need to be used for operation of the hand-held to 25 Sigma LT load banks are able to be connected in a single network.
Chapter Four Hand-held control operation Sigma LT Hand-Held Screens Overview Set Up The hand-held has a number of screens for various functions. Below lists the main screen types with arrows showing the button and navigation flow. Load Bank Search/Start Up Screen Main Load Bank(S) Control/Status Main Load Bank(S) Instrumentation Screen LCL200 Rev 1...
Chapter Four Hand-held control operation Load Banks in a Network Load Control Load bank ID Figure 4-4 Load bank networking screens Figure 4-3 Load selection screen options With more than one load bank in a network, it may be useful to see an overview of the Note: Load increases load banks connected and individually control each one.
Chapter Four Hand-held control operation Data Logging Settings Figure 4-5 A USB symbol will appear when connected and will blink when logging is active • Instrumentation data logging is available when a USB flash drive is connected to the hand-held. A USB symbol will appear in the top right corner of the main Figure 4-6 Hand-held settings screens...
Chapter Four Status & Events Chapter Five Maintenance & Troubleshooting This chapter describes both the routine maintenance procedures needed to keep ASCO Sigma LT load banks operating correctly and the procedures you may need to troubleshoot the equipment if you run in to a problem using it.
Page 25
Chapter Five Maintenance & Troubleshooting Safety Warning Routine Maintenance Procedures Maintenance work should be undertaken only by qualified personnel who are fully aware To keep the load bank in good working order, carry out the following maintenance tasks at of the danger involved and who have taken adequate safety precautions. the specified intervals: Always isolate all the supplies to the equipment before inspecting, moving equipment, Daily (after transportation or before each use of the load bank):...
Page 26
Chapter Five Maintenance & Troubleshooting Fault Finding Sigma LT Load Bank Status Display The following chart covers some of the typical faults you might encounter and some The load bank status is displayed on the seven segment LED located on the Sigma LT front possible solutions.
Page 27
Chapter Five Maintenance & Troubleshooting Sigma LT Hand-Held Display Error Type Display Possible Causes • Data logging file open failure Log open failed USB flash drive corrupted or unreadable. As well as the Sigma LT digital toggle display messages and errors will also appear on the •...
Page 28
Appendices The following pages contain additional information that may be useful but does not easily fit in with the rest of the text. This includes a specification for each of the ASCO Sigma LT load banks and a number of diagrams that show dimensions and space requirements for each unit.
Page 31
Appendices Appendices 3040 - Installation Diagrams 3040 - Installation Diagrams Figure A-9 3040 plan view Figure A-7 3040 front view and side view Figure A-8 3040 back and side views A - 6 A - 7...
Page 32
Appendices Appendices EU Declaration of Conformity Certificate of Conformity Electromagnetic Compatibility This equipment has been designed and constructed to comply with the European Product: Load Bank Community Directive 89/336/EEC. To ensure that the requirements of the Directive and related standards are satisfied it is essential that the equipment is used as intended and in Name of Manufacturer: N J Froment &...
Page 33
Appendices Useful Equations Apparent Power (kVA) kVAr × × 1000 kVAr − Resistive Power (kW) × × × × 1000 − kVAr Reactive Power (kVAr) kVAr × − × × − × kVAr 1000 kVAr − Power Factor (pf φ Current (A) ×...
Need help?
Do you have a question about the SIGMA LT 3010 and is the answer not in the manual?
Questions and answers