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For Technical Support: 

Visit our website at:  

www.power-tronics.com

 

Call Us at: 

(830) 895-4700 

PMG, DPE Winding, Auxiliary Winding, and 

Harmonic/Resonant Winding Use 

 

The XR8 Universal Voltage Regulator is compatible with some of these types of generators but 

not others.  It is necessary to determine which type of generator you have before proceeding 

since some styles will connect differently than others while the XR8 cannot be used with some 

of these generators at all. 

 
 

PMG (Permanent Magnet Generator/Exciter): 

 

This type of generator generally has a permanent magnet generator mounted on the main shaft along 
with a brushless exciter and finally the main rotor itself.  The XR8 is a very fast responding regulator 
(1/2 cycle response time) and low enough burden on the main stator that it can be used on these 
generators without any need for the PMG input.   
 
To connect the XR8 to this type of generator, isolate and insulate the PMG leads that were connected 
to the original voltage regulator.  Measure your field resistance and proceed with sizing on 

Page 4

 
 

DPE Winding and Auxiliary Winding: 

 

These generators use an extra winding in the main stator as a power supply for the voltage regulator 
in an attempt to give the regulator a clean power source that isn’t affected by load.  The XR8 has 
proprietary filtering circuitry in its sensing stage that is largely unaffected by generator load.  Because 
the regulator isn’t affected by loading, these types of windings are not needed.   
 
To connect the XR8 to this type of generator identify, isolate, and insulate the Auxiliary or DPE wiring 
that were connected to the original voltage regulator.  Measure your field resistance and proceed with 
sizing on 

Page 4

 
 

Harmonic and Resonant Windings: 

 

This type of generator rarely has a voltage regulator, and instead relies on a phase-shifted “harmonic” 
winding and a capacitor to adjust the terminal voltage with load.  They often have a brushless 
“exciter”, but because they operate on harmonics from the AC waveform, they do not operate like a 
typical brushless exciter.   
 

Because these generators rely on AC waveform 

phasing for their voltage regulation, the XR8 

cannot be used with this type of generator. 

Summary of Contents for XR8

Page 1: ...nal inexpensive digital interface module This capability makes the XR8 suitable for automated or unattended installations or large scale parallel operations Like our previous models the XR8 is fully repairable All major electronic components are not encapsulated to facilitate repair while all sensitive components are encapsulated to protect them from contamination and moisture The XR8 is compatibl...

Page 2: ...enerators 7 Hookup Connection A 8 Parallel Configuration for Connection A 9 Hookup Connection B 10 Parallel Configuration for Connection B 11 Hookup Connection C 12 Parallel Configuration for Connection C 13 Initial Setup and Commissioning 14 Optional Power Tronics Add On Modules 15 Conversion From Shunt Wound to Solid State Regulation 16 Internal Fuse Replacement 17 Application Troubleshooting 18...

Page 3: ...rly installed the XR8 Universal Voltage Regulator is designed to provide a lifetime of service A Generator voltage regulator has several automated tasks it must perform in order to provide reliable clean and regulated electricity It must build up the generator regulate the terminal voltage within its design specifications and protect both itself and the generator should a fault situation arise The...

Page 4: ... A B or C from the chart below Exciter Field Resistance 26Ω Exciter Full Load Voltage 125VDC Use connection A See Page 8 Exciter Field Resistance 13Ω Exciter Full Load Voltage 63VDC Use connection B See Page 10 Exciter Field Resistance 6 5Ω Exciter Full Load Voltage 32VDC Use connection C See Page 12 Note about Field Resistance When measuring field resistance on a brushless generator simply measur...

Page 5: ...rator To determine your full load exciter field voltage use the following formula EExc Where EGen Conf is your Generator s configured voltage e g 120 208 240 480V etc EGen Output is your recorded output voltage and EBattery is your battery voltage 12V usually Next calculate your maximum exciter field amperage using your measured field resistance and your calculated exciter voltage using the follow...

Page 6: ...39V Parallel Wye 208 240V 3ø Voltage L L 208 240V Voltage L N 120 139V NOTE 208V is Standard Voltage Series Delta 240V 3ø Voltage L L 240V Voltage L1 L2 N 120V Voltage L3 N 208V NOTE L3 N is a High Leg 208V instead of 120V Double Delta 120 240V 1ø Voltage L L 240V Voltage L N 120V Preferred Single Phase Connection Don t Use Zig Zag if Possible NOTE Derate generator by 1 3 rated capacity when using...

Page 7: ...Measure your field resistance and proceed with sizing on Page 4 DPE Winding and Auxiliary Winding These generators use an extra winding in the main stator as a power supply for the voltage regulator in an attempt to give the regulator a clean power source that isn t affected by load The XR8 has proprietary filtering circuitry in its sensing stage that is largely unaffected by generator load Becaus...

Page 8: ...or use on 480V systems either connect the regulator to the winding center taps T7 and T9 See Page 6 or use a 480 240V step down transformer rated at 1 5KVA Connecting the input of the XR8 to 2 different legs of the generator as shown in the diagram below will result in greater regulation accuracy than when connecting line neutral NOTE It is not necessary to jumper terminals 7 and 8 if not using th...

Page 9: ...ance a bit at a time until satisfactory droop is achieved CT should be sized at 25 35VA burden XR8 Professional Series Universal Voltage Regulator 240VAC MAX Secondary Voltage 100K 2W Unit Parallel Switch Reactive Droop Adjustment 10Ω 100W CT Rating XXX 5A 25 35VA Transformer Rating XXX 240V 1 5KVA Regulator On Off Switch Rate for Primary Voltage 10A Setup Tips Isolation Transformer is recommended...

Page 10: ... to the unit will result For use on 480V systems either connect the regulator to the winding center taps T7 and T9 See Page 6 or use a 480 240V step down transformer rated at 1KVA Connecting the input of the XR8 to 2 different legs of the generator as shown in the diagram below will result in greater regulation accuracy than when connecting line neutral NOTE It is not necessary to jumper terminals...

Page 11: ...tance a bit at a time until satisfactory droop is achieved CT should be sized at 25 35VA burden XR8 Professional Series Universal Voltage Regulator 240VAC MAX Secondary Voltage 100K 2W Unit Parallel Switch Reactive Droop Adjustment 10Ω 100W CT Rating XXX 5A 25 35VA Transformer Rating XXX 240V 1KVA Regulator On Off Switch Rate for Primary Voltage 10A Setup Tips Isolation Transformer is recommended ...

Page 12: ...ither connect the regulator to the winding center taps T7 to T0 See Page 6 or use a 480 120V step down transformer rated at 500VA Preferred for superior regulation accuracy Connecting the input of the XR8 to 2 different legs of the generator through a transformer will result in greater regulation accuracy than when connecting line neutral as shown in the diagram below NOTE It is not necessary to j...

Page 13: ...resistance a bit at a time until satisfactory droop is achieved CT should be sized at 25 35VA burden XR8 Professional Series Universal Voltage Regulator 120VAC MAX Secondary Voltage 100K 2W Unit Parallel Switch Reactive Droop Adjustment 10Ω 100W CT Rating XXX 5A 25 35VA Transformer Rating XXX 120V 500VA Regulator On Off Switch Rate for Primary Voltage 10A Setup Tips Isolation Transformer is recomm...

Page 14: ... turning the adjustment screw clockwise right The voltage adjustment is a 25 turn pot NOTE The maximum internal voltage setpoint is 260VAC This helps prevent accidental over voltage conditions due to incorrect installation 8 Place the generator on line and observe the frequency and voltage 9 If the generator is being paralleled measure the droop during loading and adjust the droop resistor as nece...

Page 15: ...Converts the XR8 into a 125VDC 25ADC Static Exciter AFM5X Automatic Flash Module Adds Automatic Flash or Battery Flash to installations with low residual or requiring guaranteed buildup EIM1020VM External Interface Card Allows the XR8 to be controlled externally by virtually any digital load sharing controller VAR controller genset controller or digital governor controller MOP1224HD Motorized Pote...

Page 16: ...e the XR8 Universal Voltage regulator with older Shunt Wound exciters that originally had manual mechanical or series solid state voltage regulators by converting the wiring as in the diagrams below If the generator will not build up after conversion try switching your F and F leads at the regulator and try starting up again NOTE Armature brushes MUST BE ISOLATED from the field leads for proper op...

Page 17: ... Littelfuse Part Number 0314010 MXP or 0314010 HXP Fuse Replacement Procedure Refer to the image above for easy reference Remove the 4 screws located on the front of the aluminum mounting can to allow removal of the can Remove the aluminum mounting can from the circuit card Use a continuity tester or multimeter to test the fuses A good fuse will read continuity or 0Ω resistance Replace open fuses ...

Page 18: ...generator 4 Non linear Inverter load or defective connection in exciter field 5 Open diode in exciter or shorted rotor in generator 6 Loose component in voltage regulator 7 Loose wiring connections 8 Input voltage to regulator is too low 9 Exciter field is grounded 10 Non linear Inverter load or wrong selection for regulator hookup 11 Exciter fields are reversed 12 Wrong selection of regulator wir...

Page 19: ...atus light is not on do not continue this test 6 SLOWLY turn the internal voltage adjustment CW until the incandescent light bulb turns fully on then adjust the internal voltage adjustment CCW until the light bulb is off 7 Observation You should be able to taper the incandescent light bulb on and off in a relatively smooth manner If the light flashes on or off quickly the regulator has an internal...

Page 20: ...ww power tronics com warranty Problem Description History Please be detailed Ship To Address City State Zip Country Company Name Contact Person Telephone Number Email Address Primary Load Please Explain Repair Warranty Request Information Generator Leads Check One 12 10 6 4 3ø 4 1ø 3 Generator Wiring Mode Check One High Wye Low Wye Series Delta Zig Zag Double Delta Single Phase Other Terminal Volt...

Page 21: ...se date and serial number of the defective part A repair request form must be sent in with the product before repairs will begin You can obtain this form by contacting Power Tronics Inc Send repairs to Power Tronics Inc 2802 Cobbler Ln Kerrville Texas USA 78028 Send in repairs only by UPS or FedEx USPS will NOT deliver to our facility Any one of the following conditions will void the warranty v Ov...

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