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Description

ASCO 4900 Outdoor Resistive Load Bank • Part Number 1251794

2-1

SECTION II

DESCRIPTION

ASCO Load Bank is an outdoor unit designed to absorb a balanced resistive load of unity power
factor, at a specified 3-phase voltage. The total load capability of the K975A Load Bank is 2500 kW
at 480 VAC, 3-phase, 60 Hz. The load steps are 50, 50, and (24) at 100 kW.

The Load Bank contains two 15 H.P. blower motors that operate from 480 volts, 3-phase, 60 Hz, and
provide the necessary cooling air for the load elements. The blower motors derive voltage from the
main bus and are controlled by motor starter contactors. Overcurrent protection is provided by fuses
and overload relays. When an external source is used for blower and control power, its voltage may
be independent of the LOAD voltage of the generator under test. The blower air delivery is
27,000 CFM at 1.4 inch of static pressure.

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C A U T I O N

This Load Bank should never be used without the fan blower motors
operating. Inadequate cooling airflow will result in resistor elements
overheating and a definite fire hazard.

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Two airflow switches are provided to monitor the flow of cooling air. These differential pressure
switches are electrically interlocked with the load application controls to prevent load application if
the blowers are not working properly.

Two thermocouples are provided to sense the exhaust air temperature. The sensors are located at the
top of each exhaust heater case. The thermocouples are wired to an adjustable temperature sensor
set at a trip point of 350



F. If the trip point is exceeded, it will prevent load application.

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Содержание 1251794

Страница 1: ...P N 1251794 4900 Load Bank User Manual ...

Страница 2: ...ASCO MODEL 4900 OUTDOOR RESISTIVE LOAD BANK Part Number 1251794 2500 kW 480 VAC 3 PH 60 Hz 2018 ASCO Power Technologies Inc April 18 2018 Cleveland Ohio ...

Страница 3: ... testing of the equipment herein disclosed is not to be used for manufacturing or procurement and is not to be disclosed to anyone other than persons in the Division or the Company or the Government as the case may be responsible for action relating to this document without the express written permission of ASCO Power Technologies LP WARRANTY The last page of this document contains an express limi...

Страница 4: ...ESCRIPTION 2 1 Section III INSTALLATION 3 1 Section IV OPERATION 4 1 Section V MAINTENANCE 5 1 Section VI REPLACEMENT PARTS LIST 6 1 APPENDIX Load Bank Troubleshooting Guide DRAWINGS SB3833 Outline Drawing Load Bank 1252846 Schematic Diagram D24712 Resistor Assembly D26614 Resistor Assembly SUPPLEMENTAL VENDOR MANUALS Froment Intelligent Handheld Terminal IHT Quickstart Guide i ...

Страница 5: ...uld be conducted to ensure the reliability and safety built into your ASCO equipment The Load Bank is an industrial test unit designed to be used outdoors safely However because the purpose of the Load Bank is to dissipate electrical energy there are inherent dangers to operators and equipment These dangers are outlined in this section Electrical energy is transformed into heat by the resistors Th...

Страница 6: ...ausing a constant rise in cooling air temperature 9 After running a load test residual heat may be removed from the Load Bank by allowing the blower to operate for a few minutes after the load is removed This procedure is not required for maintaining Load Bank integrity but it may guard operating personnel from possible burn injuries 10 The operator should avoid coming in contact with the resistor...

Страница 7: ... and Health Act OSHA should be followed when installing the equipment to reduce hazards to persons and property 17 The load bank has special quick connect cam lok style connectors for load connection All connectors must be fully engaged and share current before load is applied Keep connector covers on all locations when not in use during transit and during storage 18 Louver cover plates must be re...

Страница 8: ... used for blower and control power its voltage may be independent of the LOAD voltage of the generator under test The blower air delivery is 27 000 CFM at 1 4 inch of static pressure C A U T I O N This Load Bank should never be used without the fan blower motors operating Inadequate cooling airflow will result in resistor elements overheating and a definite fire hazard Two airflow switches are pro...

Страница 9: ...uminized sheet steel to make a rigid structure Mounted within the structure are the load element resistor assemblies the blower assemblies and the necessary load step contactors motor starters motor overload relays fuses and customer connection bus bars The cooling air is drawn in from one end forced across the resistor elements and exhausted out the opposite end The component enclosure compartmen...

Страница 10: ...he Intelligent Handheld Terminal IHT and is used the unit is operating under Sigma control The control panel contains a STATUS UNIT ONT TEST light START pushbutton a STATION SELECT switch and a STOP RESET pushbutton The control panel also includes the connection for the IHT The second control panel is a manual control panel that is used as a toggle switch back up for the Sigma control system A key...

Страница 11: ...ety hazard and will void our warranty The following installation instructions are critical to the safe operation of the Load Bank Refer to the SAFETY CONSIDERATIONS section of this manual LOCATION The Load Bank must be used in a cool well ventilated area It must be installed where cool air is continually available and where hot exhaust air will not be recirculated through the Load Bank If the Load...

Страница 12: ...gure 3 1 If a unit is backed into a corner the 6 feet is no longer sufficient Consult ASCO Engineering to review prior to installation The intake must not ingest heated air from another source The maximum ambient intake air temperature is 120 F 3 Provide a minimum of 8 feet from any obstruction for exhaust clearance to prevent air restrictions and to limit air recirculation For thermal considerati...

Страница 13: ...nches a physical inspection of the Load Bank intake and exhaust is required prior to operation Any significant snow drifts or snow depths must be cleared prior to operation 4 Standard Load Banks are designed for operation between sea level and 2 000 feet maximum altitudes Operation at altitudes over 2 000 feet above sea level requires special consideration Contact ASCO for assistance 5 In general ...

Страница 14: ...ten approval from ASCO prior to installation Airflow is also restricted when two or more Load Banks have air inlets positioned close to each other This competition for cooling air causes a low pressure area restricting adequate airflow When operating a Load Bank outdoors the wind can work for or against the Load Bank cooling system If the Load Bank is positioned with the prevailing wind opposing t...

Страница 15: ...itch that can be locked out LOAD CONNECTIONS Quick connect cam lok style connectors are installed on the outside corner of the Load Bank frame All nine connections per phase and the three ground connections must be made prior to applying any load The connectors are provided with mating connectors Use these mating connectors on interconnection load cable Interconnection cable by others should be 4 ...

Страница 16: ... PRIOR TO OPERATION This Installation Checkout Procedure is intended to be used upon initial receipt of equipment and following any relocation of a permanent mounted Load Bank These procedures apply to Load Banks in general and may include steps not relevant to the specific unit being installed Disregard those procedures which do not apply W A R N I N G THE FOLLOWING TESTS ARE TO BE ACCOMPLISHED B...

Страница 17: ...hich are factory supplied must be used B Check terminations that they are properly torqued 3 Utilize system schematics to ohm out customer supplied interconnection control wiring and safety circuits A If control wiring is all the same color ohm out each individual wire to confirm proper labeling and placement C A U T I O N Control wiring must be a minimum of 14 AWG for wire runs under 50 feet Cons...

Страница 18: ...afety circuitry with a jumper across the air switch contact at its termination at the terminal block 5 Turn on the POWER switch and verify the proper relays energize with each individual load switch A Turn on each load step individually and observe that each relay or relays pulls in without chatter or hesitation B Turn on all the load steps If chatter or hesitation is observed locate the cause of ...

Страница 19: ...ure is intended to be a guide to Load Bank installations in general Special installation considerations not addressed herein may be necessary due to installation site or environment Any questions or concerns regarding Load Bank installation should be directed to ASCO Field Service at 216 573 7600 ...

Страница 20: ...ill react as low impedance short circuit paths resulting in a definite fire hazard C A U T I O N The operation of the blower is vital to the safe operation of this Load Bank When the BLOWER is turned ON the AIR FAILURE light will come on momentarily until the blower accelerates up to its operating speed at which time the light will go off If the air switch prevents the load from being applied AIR ...

Страница 21: ...er or block screens NOTE Lower voltages may be applied to the load circuit of the Load Bank The applied kW with a lower voltage is computed with the following formula 2 2 Rated Applied Rated Voltage Applied Voltage kW kW C A U T I O N Never exceed the rated voltage as this will cause the Load Bank to overheat Do not apply DC voltages as the contactors do not have arc blowout magnets Also the react...

Страница 22: ...at the top of this page Put on a grounded wrist strap before handling any ESD sensitive item Clear work area of Styrofoam plastic and vinyl items such as coffee cups Handle ESD items by the body never the open edge connectors Never slide ESD sensitive items over any surface Transport ESD sensitive items in a static shielding container to a static free work station If a static free work station is ...

Страница 23: ...ipment in a good safe condition All maintenance work must be done only by qualified personnel W A R N I N G Personal injury from electrical shock or from the moving fan blades may result if ALL sources of power are not disconnected Refer to the SAFETY CONSIDERATIONS section of this manual Eye protection should be worn when cleaning the unit with compressed air DAILY 1 Remove any restrictions to th...

Страница 24: ...ghten where required 4 Inspect all connections for oxidation or corrosion Clean the connection or replace the hardware where required 5 Verify that the airflow switches work properly 6 Inspect all magnetic contactors to make sure that the contacts are not severely pitted or corroded The contacts must move freely and be properly seated 7 Clean all dirt and debris out of the Load Bank This can be ac...

Страница 25: ...of the cover panels Replaceable components are listed in the Replacement Parts List ASCO maintains an inventory of normally used items C A U T I O N When replacing fuses attached to bus bars tighten wire connection before the fuse is attached to the bus bar Improper assembly may result in damage to the fuse elements and cause premature fuse failure ...

Страница 26: ...anges are sometimes necessary and revisions to the parts list may be made at any time without notice REFERENCE DESIGNATORS Service personnel may use this parts list along with the ASCO system schematics to identify and order replaceable parts The reference designators were carefully selected and matched to those on the schematic diagrams and equipment to simplify the troubleshooting and repair pro...

Страница 27: ...473042 96 PIN SPRING CLIP 461156 96 RA3 RESISTOR ASSEMBLY D26614 1 RESISTOR ELEMENT A23312 18 RESISTOR ELEMENT 605820 30 INSULATOR 411141 960 SPRING 473042 96 PIN SPRING CLIP 461156 96 RA4 RESISTOR ASSEMBLY D24712 1 RESISTOR ELEMENT 605820 48 INSULATOR 411141 960 SPRING 473042 96 PIN SPRING CLIP 461156 96 RA5 RESISTOR ASSEMBLY D24712 1 RESISTOR ELEMENT 605820 48 INSULATOR 411141 960 SPRING 473042 ...

Страница 28: ...7 1 S500 SWITCH SELECTOR EI00744 1 XS500 CONNECTOR EI01845 1 COMPONENT ASSEMBLY D49453 1 F200 205 FUSE 30 AMP 324284 6 XF200 205 FUSEBLOCK 324997 2 K61 71 RELAY WITH AUX B14711 2 S2 3 SWITCH SENSING 360772 2 K62 72 RELAY OVERLOAD 350980 2 XK62 72 BRACKET MOUNTING 408304 2 K130 131 RELAY 24 VDC 4 POLE 350605 2 CR130 131 RECTIFIER 354585 2 B1 2 PANEL FAN D30842 3 2 CONTROL ASSEMBLY 997419 1 PS2 SUPP...

Страница 29: ...AMBER AVT 329681 2 DS501 504 LAMP INDICATOR RED 329682 4 S501 SWITCH KEY LOCK 362087 1 K501 502 RELAY 3 POLE 20A W AUX 352118 2 K500 RELAY 3 POLE FORM C AVT 351170 1 S502 510 535 SWITCH TOGGLE 360589 27 S503 SWITCH PUSHBUTTON RED START 361873 1 S504 SWITCH PUSHBUTTON BLACK STOP 361874 1 M500 METER DIGITAL 338344 1 R1 6 RESISTOR 12K OHM 2W 119311 6 F503 505 FUSE 10A CLASS CC 324128 3 XF503 505 FUSE...

Страница 30: ... is not connected according to the Schematic Interconnection Diagram c Terminals were damaged during shipment d Fuses are blown Check and replace as required e Fuse is blown in Load Bank control circuit Check and replace as required f Dirty or loose connection at Main Power Switch When checking fuses for continuity be sure to remove all fuses from clips in fuseblock or Disconnect Switch Test each ...

Страница 31: ...ry 3 BLOWER FAILURE indicator lights yet blower is operating a Airflow restrictions present at Load Bank intake or exhaust b Improper fan blade rotation or phase reversal Check fan motor power connections for proper phase sequence c Air Differential Pressure Switch is malfunctioning d Blower Fail Relay is malfunctioning 4 Fan blade is broken or not turning a Fan blade motion is obstructed b Fan bl...

Страница 32: ...ad step resistor is open 6 Contactor chattering exists a Contacts and or core are dirty or corroded b Connections to contactor coil are loose c Control circuit line voltage is too low 7 Load Bank or load step does not give rated load a Applied load voltage is either derated or inadequate b Contactor does not close properly c Load step resistor element is open d One of the individual load branch ci...

Страница 33: ...zed b A short circuit exists in the blower or control circuit When checking fuses for continuity be sure to remove all fuses from clips in fuseblock or Disconnect Switch Test each fuse individually out of circuit If tested in circuit there is the possibility of feedback which causes false readings A blown fuse may still check out OK ...

Страница 34: ...nologies LP It is furnished solely to provide information sufficient for instruction operation maintenance evaluation and testing of the equipment herein disclosed is not to be used for manufacturing or procurement and is not to be disclosed to anyone other than persons in the Division or the Company or the Government as the case may be responsible for action relating to this document without the ...

Страница 35: ...he Avtron product specified herein is originally deployed for use the User in the fifty United States or Canada This Warranty is not transferable or assignable without the prior written permission of ASCO Assignment of Warranties ASCO assigns to User any warranties which are made by manufacturers and suppliers of components of or accessories to the Avtron product and which are assignable but ASCO ...

Страница 36: ...Y APPLICATIONS OR WITHIN THE CONTAINMENT AREA OF A NUCLEAR FACILITY OR FOR INTEGRATION INTO MEDICAL DEVICES Limitations THIS WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE USER S SOLE AND EXCLUSIVE REMEDY IS REPAIR OR REPLACEMENT OF THE AVTRON PRODUCT AS SET FORTH HEREIN IF USER S REMEDY IS DEEMED TO FAIL O...

Страница 37: ...land Ohio U S A 44125 Tel 216 573 7600 loadbanks ascopower com ASCO Innovative Solutions The ASCO and ASCO Power Technologies marks are owned by Emerson Electric Co or its affiliates and utilized herein under license 2017 ASCO Power Technologies All Rights Reserved ...

Страница 38: ...nologies LP It is furnished solely to provide information sufficient for instruction operation maintenance evaluation and testing of the equipment herein disclosed is not to be used for manufacturing or procurement and is not to be disclosed to anyone other than persons in the Division or the Company or the Government as the case may be responsible for action relating to this document without the ...

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Страница 57: ...Intelligent Hand held Terminal IHT Technical Reference Manual ...

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Страница 59: ...esigns specifications publications and software described or included herein The property shall not be used in whole or part for any purpose other than in connection with the Company s particular products that this document is intended to accompany The Company s identification marks on its products and documents must not be intentionally removed concealed or defaced This document may not be copied...

Страница 60: ...est Setting the Supply on Test Rating Values Checking the rating values Settings 2 2 Load Bank Checking for load banks The Options Pages Options 1 5 Control Options 2 5 Display Options 3 5 Loading Options 4 5 Resolution Options 5 5 Serial Port The Test Pages 19 Test 1 4 AVR and Governor Adjustment Setup Test 2 4 Full Load Testing Line to Line Test 3 4 Full Load Testing Phase to Neutral Test 4 4 Tr...

Страница 61: ...ect means of controlling the operation of Froment Sigma controlled load banks whilst simultaneously monitoring the performance of the generator under test This manual provides a detailed reference to the Froment Intelligent Hand held Terminal IHT including details of its more advanced features ...

Страница 62: ... inlet and outlets are completely unobstructed and that there is no loose paper plastic bags or other debris that may be drawn on to the air inlet grille obstructing the airflow Combustible material left near the air discharge should be removed Only operate the load bank with all the guards in place with doors closed and with all of the covers and protective screens securely in position Always rou...

Страница 63: ...IHT Technical Reference ...

Страница 64: ...ow the progress of generator tests to be monitored In operation the IHT synchronises the load events and ensures that the load is shared proportionally between each connected load banks Instrumentation information from all load banks is summed and displayed on the IHT s screen This manual describes Version 4 of the IHT software Menu selection keys F1 to F4 and keys are used to adjust selected load...

Страница 65: ... arrangement Note Voltage and frequency instrumentation displayed on the IHT display is taken from the load bank with the lowest number Setting the Load Bank Number Each load bank connected must have a unique number in the range from 1 to 14 The default number for a particular load bank is assigned during manufacture or on commissioning If there is a number selector switch on the load bank this ca...

Страница 66: ...hat are highlighted or displayed on the LCD screen in some contexts they are also used to adjust the LCD screen contrast see later for more on this Pressing I applies load if in Manual Test mode or starts an automatic test if in Automatic Test Mode If a load is already applied pressing I forces the IHT to carry out a load correction that is to say that it will adjust the number of load elements ap...

Страница 67: ...us bar Page Title Figure 1 3 The IHT LCD display The IHT Help System The IHT has a comprehensive help system built in This is context sensitive and will provide you with information on the functions that are currently available on screen If after the initial power up there is a 12 seconds delay with no activity the help screen is displayed automatically Figure 1 4 IHT default help screen At other ...

Страница 68: ...as not been pressed or was pressed before the load bank had performed its power on self test both Start and Stop illuminated Wait until the Stop button only is illuminated before pressing the Start button External Emergency Stop buttons if fitted are depressed Release all Emergency Stop button and press the Start button Load bank ESR not energising or faulty auxiliary contact No Load Banks Active ...

Страница 69: ...t exceeded and check hot air discharge is not recirculating Allow the load bank to cool and then press Stop and Start buttons Over temperature trip faulty More than one over temperature trip may be fitted These devices will automatically reset when they cool down Air Flow Failure On LoadBank nn Air Flow signal not present after fan output energised Fan or Duct obstructed Flow detector faulty Check...

Страница 70: ...m overload during testing and will allow the percentage loads applied to be calculated accurately The second part is concerned with carrying out the test itself Various percentage loads are applied and the Sigma instrumentation is used to view the generator s response However there is much more to the IHT than the ability to conduct basic manual tests We will explain all this in more detail and co...

Страница 71: ...gs are correct press F4 TEST to start testing the supply Test 1 4 is the first of the four test instrumentation pages provided by the IHT Select the percentage load required using the and keys Preselect the percentage load required for the next load change using the and keys A pop up will appear showing the adjusted value and this is also displayed on the right of the status line Apply the load by...

Страница 72: ... to the IHT and load bank s operation Edit Settings Use the or keys or F1 PRESET to adjust the supply Press F3 SELECT to change the value being edited kVA V Hz ph or cos Ø New Supply on Test Press F2 NEW to measure and reset the supply on test voltage frequency and number of phases Settings 1 2 This page is the starting point of the IHT menu system It is displayed immediately after startup and sho...

Страница 73: ...nk and F2 NEW is pressed the Sigma controller will carry out the following sequence of operation Check the voltage and frequency on each load bank connected Check voltage and frequency stability Check phase rotation on each load bank Checks voltages to determine whether this is a three or single phase connection At the end of this sequence the Sigma controller will Display a warning message if any...

Страница 74: ... the automatically set values are acceptable and you can usually do this by comparing them to those on the generator s rating plate Figure 1 10 Typical generator rating plate Note In this example the generator is rated at 400V 50Hz with an apparent power of 1100kVA at 0 8 cos Φ The voltage frequency number of phases apparent power kVA and power factor cos Φ values shown on the Supply on Test page ...

Страница 75: ...item Note The setting for power factor should reflect the generator s rating not the capability of the load bank Most generators are rated at 0 80 cosΦ and if that is the case you should set this even if you intend to test the supply at unity power factor As the values on the left hand side of the screen are adjusted the active or resistive power kW and apparent current A are re calculated and sho...

Страница 76: ...upply on test rating from Settings 1 2 Load bank rating and power factor Resistive load bank capacity Inductive load bank capacity Capacitive load bank capacity Number of load banks connected Figure 1 12 The Settings 2 2 Load Bank page Checking for load banks Pressing F2 CHECK will cause the IHT to check the number of load banks connected It should be used to clear any errors on a load bank or whe...

Страница 77: ...gs 2 2 Load Bank page F1 PAGE F1 PAGE F1 PAGE F1 PAGE F1 PAGE F3 OPTIONS F4 OK Figure 1 13 The Options Pages Navigate between the options pages by pressing F1 PAGE Pressing F3 SELECT selects a list item for adjustment You can enable or disable the selected option by pressing the or key Press F2 HELP for further information on the selected option Press F4 OK at any time to exit the options pages an...

Страница 78: ...iod Cyclic Auto Test When the automatic test sequence reaches the last step it will restart the sequence at step 1 Show Total Test Time If this option is selected the status line on the Test pages will show the total accumulated test time Otherwise it will show the time since the current load was applied Options 2 5 Display Figure 1 15 The Options 2 5 page Contrast Use the and keys to adjust the L...

Страница 79: ...y the supply on test See Using Load Correction on page 1 24 for more details on the operation of load correction Contactor Delay Turning on Contactor Delay ensures that all of the connected load banks synchronise load events to ensure the cleanest possible load change on the supply on test Switching off Contactor delay can result in the generator AVR response appearing worse than normal Stall Prot...

Страница 80: ...age A 9 pin RS232 serial port is fitted to the bottom of the IHT This can be used to either connect a 40 column battery powered printer or can be connected as a MODBUS communications line for remote control of the load banks Printer Selecting this option enables the printer interface Use the and keys to set a time interval in seconds for a printed report showing the instrumentation readings to be ...

Страница 81: ...cle through the Test screens Figure 1 19 The Test pages Press F1 PAGE to cycle through each of the pages in turn Note The Test pages Test 1 4 to Test 4 4 are available for viewing at any time irrespective of whether a test is running As the generator test runs the IHT instrumentation will show the generators response to the load applied in real time The four test pages offer different views of the...

Страница 82: ...governor settings before starting a full load test Test 2 4 Full Load Testing Line to Line Actual power Power factor Apparent power RMS Current Maximums and minimums since the last load change RMS line to line voltages Real time voltage and frequency display Figure 1 21 IHT Test 2 4 page The second and third Test pages display the electrical data required for full load testing from different persp...

Страница 83: ... last load change Frequency errors from the last load change Maximums and minimums since the last load change Real time voltage and frequency display Figure 1 23 IHT Test 4 4 page Note Applying a load while this page is visible creates a high resolution version of the graph You must stay on the screen for the full six seconds during which time load changes other than load reject are inhibited For ...

Страница 84: ...formance class Parameter Unit G1 G2 G3 Transient frequency deviation from rated frequency 100 sudden power decrease 18 12 10 Sudden power increase 15 10 7 Frequency recovery time 100 sudden power decrease s 10 5 3 Sudden power increase s 10 5 3 Transient voltage deviation 100 sudden power decrease 35 25 20 Sudden power increase 25 20 15 Voltage recovery time 100 sudden power decrease s 10 6 4 Sudd...

Страница 85: ...aries depending on the test mode manual or automatic as shown in Figure 1 24 Page Title Test Mode Manual Auto Auto Test Step No Auto Test Status running paused stopped Time elapsed since last load change Current load selected kW kVA or cos θ Figure 1 24 The Test screen status bar showing the differences between automatic and manual modes ...

Страница 86: ...ed the IHT will look up in its internal load table to see if it has a stored correction for that load value If so it will apply the stored correction If no correction is found then it will calculate the load correction based on the actual power measured with a compensation for the actual voltage and frequency If the same load is applied a second time the IHT will always calculate a new load correc...

Страница 87: ...tive only load bank is used then the selection will be percentage load and kW only Power factor can be set between 0 00 and 1 00 cos Φ on the IHT most generators are rated at 0 8 cos Φ However non unity power factor values are dependant on the load bank capacity and the supply size Adjust the Load Percentage Use the or keys to set the percentage of load to be applied Adjust kVA Use the or keys to ...

Страница 88: ...m either of the Settings screens to get to the Test 1 4 page Note The load select pop up appears when either the or F3 SELECT key is pressed The supply settings kW or kVA and power factor are displayed in the pop up header 2 Use the and keys to select the percentage size of the required load 3 The pop up window will disappear after a few seconds but the newly set value will be shown at the top rig...

Страница 89: ...tion screen will reflect the new load Note The fan s can be started without any load being applied by selecting zero load and pressing I This can be a useful feature if you are using the supply on test to power the load bank the fans can be started without any transients created during the startup having any effect on the test 2 If the power values shown are not as anticipated press I again to re ...

Страница 90: ...l allow the equipment to cool Warning Ensure the power source under test is fully isolated and protected before starting to remove the power cables from the terminal compartment If the Ramp Down on Reject function is enabled see page 1 16 the load will ramp down for 12 seconds before the fan delay starts The IHT s LED will flash to indicate this Press O a second time to reject the load immediately...

Страница 91: ...ce is required If necessary press to remove the load before the end of the automatic test sequence O Press I apply the load and start the automatic test sequence Select Auto Press F2 AUTO to select automatic testing mode Edit the Test Sequence Use F3 SELECT and the or keys to edit values F1 NEXT moves to the next stage of the sequence F2 COPY copies the current value to the next stage Press F4 to ...

Страница 92: ...quence stages The ability to make a test sequence setting is not limited by the capabilities of the load bank that the IHT is connected to If the load bank is unable to apply the load that has been set the stage in the sequence will be marked with an exclamation mark Figure 1 28 A warning is shown if the connected load bank cannot apply the load This may be shown for a resistive only load setting ...

Страница 93: ...ll cause the IHT to ignore the step Setting the load percentage for the first step at 0 will allow the fan to start without any load being applied 4 Pressing F2 COPY will copt the current value to the next sequence stage 5 Press F3 SELECT to choose the next value to be changed 6 When all values are edited press F1 NEXT to choose the next sequence stage to be programmed 7 Press F4 OK to return to t...

Страница 94: ...e Resume a paused test sequence by going back into Automatic mode and pressing the I key The sequence will restart with the time remaining for the load step The and keys can be used to adjust the percentage load applied as the sequence is running Press the I key to apply the new load This can be useful if you need to reduce the load because the preset load is causing the generator to stall Note If...

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