Load Sharing Module - Home Mega Global Solution
Load Sharing Module - Home Mega Global Solution Load Sharing Module - Home Mega Global Solution
Load Sharing Module Manual 26011Load Comparator CircuitIn the load comparator circuit, the load signal voltage is balanced with the othergenerator sets in the system via the load sharing lines. The comparator circuit ofeach Load Sharing Module includes a load gain potentiometer to adjust eachgenerator set's load signal so that the load signal voltage of each is the same at fullload. This compensates for varying CT ratios or different generator set sizes. Theload sharing voltage will be one-half the measured voltage of the load signal testpoint.Isochronous Load SharingEach comparator circuit compares the load signal voltage for its generator set totwo times the voltage on the load sharing lines and produces an error voltageproportional to the difference. This error voltage is used to generate a pulse widthmodulated signal which is output to the speed control. This output biases the speedloop of the speed control until the load signal voltage is equal to that of othergenerators on the load sharing lines.Droop OperationIn droop operation, a portion of the load signal voltage is fed to the controllercircuit. This voltage is used by the comparator circuit to reduce the control outputby a percentage determined by the DROOP potentiometer. The output is reduced,and the speed control reduces engine power output according to the desired drooppercentage.When a generator set using the Load Sharing Module is paralleled in droop withother generator sets, the common load signal on the paralleling lines is not used.The frequency of the generator set will therefore vary with load, so it must bedetermined by a different means. In an isolated system with two or more generatorsets paralleled, if isochronous speed control is required, one of the generator setsmust be running in the isochronous (constant speed) mode. This generator setmaintains the frequency of the system. If a generator set is in droop and isparalleled with an infinite bus, the bus determines and maintains the frequency.The DROOP percentage and the speed setting on the engine speed controldetermine the amount of the load that is carried by the generator, when running indroop.Auxiliary EquipmentThe Woodward SPM-A synchronizer functions by biasing the output of the LoadSharing Module. All other Woodward auxiliary generating control equipmentfunctions by biasing the voltage on the load-sharing lines.24 Woodward
Manual 26011Chapter 6TroubleshootingLoad Sharing ModuleThe following trouble-shooting guide is an aid in isolating trouble to the LoadSharing Module, engine control, plant wiring, or elsewhere. The guide assumesthat the system wiring, soldered connections, switch and relay contacts, and inputand output connections are correct and in good working order. Make the checks inthe order indicated.!CAUTIONTo prevent possible serious damage to the Load Sharing Module, donot attempt to service the unit beyond that described in the operatinginstructions. All other servicing should be referred to qualifiedservice personnel.SYMPTOMS CAUSE TEST/REMEDYUndesirable speeddecrease with loadincrease.Erratic Load SharingModule operation.Load Signal voltageis low. AdjustingLOAD Gain won'traise it.Droop mode switch isopen or auxiliarycontact is open. LoadSharing Module is indroop mode.Improper engineoperation. Operate theengine and observespeed while applyingload.Faulty engine control.Disconnect the LoadSharing Module andload the engine as asingle, isolated unit.Open or intermittentwire.EMI (ElectromagneticInterference).Unstable system.Unstable voltageregulator.Poor system stability.Incorrect phasing of CTand PT wiring.Insufficient CT output.Jumper Load Sharing Moduleterminals 13 and 14. If thiscorrects the problem, replacewiring or switch as required. Themodule will not go into droopwith the terminals connected.If droop occurs near the full loadpoint only, it is possible theengine is not producing thehorsepower called for or is beingoverloaded.If speed continues to decreasewith load, engine operation maybe faulty.Check all wiring for continuityand tight connections. Repair ifnecessary.Remove ground loops. Shield allwiring (load sharing lines, outputto the speed control, speed trimpot, and SPM-A synchronizerinput. Route wiring away fromnoise sources.Check system for properoperation.Consult voltage regulatormanufacturer’s manual forproper adjustment.Reduce the load signal voltageof each unit in the system tothree volts.Perform phasing check. Ifphasing check indicates need,perform procedure for correctphase wiring.Check for 5 amp CT output atfull load. Change to a lowerprimary current CT if necessary.Woodward 25
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- Page 11 and 12: Manual 26011Chapter 3InstallationLo
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Manual 26011Chapter 6Troubleshooting<strong>Load</strong> <strong>Sharing</strong> <strong>Module</strong>The following trouble-shooting guide is an aid in isolating trouble to the <strong>Load</strong><strong>Sharing</strong> <strong>Module</strong>, engine control, plant wiring, or elsewhere. The guide assumesthat the system wiring, soldered connections, switch and relay contacts, and inputand output connections are correct and in good working order. Make the checks inthe order indicated.!CAUTIONTo prevent possible serious damage to the <strong>Load</strong> <strong>Sharing</strong> <strong>Module</strong>, donot attempt to service the unit beyond that described in the operatinginstructions. All other servicing should be referred to qualifiedservice personnel.SYMPTOMS CAUSE TEST/REMEDYUndesirable speeddecrease with loadincrease.Erratic <strong>Load</strong> <strong>Sharing</strong><strong>Module</strong> operation.<strong>Load</strong> Signal voltageis low. AdjustingLOAD Gain won'traise it.Droop mode switch isopen or auxiliarycontact is open. <strong>Load</strong><strong>Sharing</strong> <strong>Module</strong> is indroop mode.Improper engineoperation. Operate theengine and observespeed while applyingload.Faulty engine control.Disconnect the <strong>Load</strong><strong>Sharing</strong> <strong>Module</strong> andload the engine as asingle, isolated unit.Open or intermittentwire.EMI (ElectromagneticInterference).Unstable system.Unstable voltageregulator.Poor system stability.Incorrect phasing of CTand PT wiring.Insufficient CT output.Jumper <strong>Load</strong> <strong>Sharing</strong> <strong>Module</strong>terminals 13 and 14. If thiscorrects the problem, replacewiring or switch as required. Themodule will not go into droopwith the terminals connected.If droop occurs near the full loadpoint only, it is possible theengine is not producing thehorsepower called for or is beingoverloaded.If speed continues to decreasewith load, engine operation maybe faulty.Check all wiring for continuityand tight connections. Repair ifnecessary.Remove ground loops. Shield allwiring (load sharing lines, outputto the speed control, speed trimpot, and SPM-A synchronizerinput. Route wiring away fromnoise sources.Check system for properoperation.Consult voltage regulatormanufacturer’s manual forproper adjustment.Reduce the load signal voltageof each unit in the system tothree volts.Perform phasing check. Ifphasing check indicates need,perform procedure for correctphase wiring.Check for 5 amp CT output atfull load. Change to a lowerprimary current CT if necessary.Woodward 25
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