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© 2020 Power-Tronics, Inc. 

 
 
 

The Power-Tronics XC4 Automatic Voltage Regulator 
is the latest upgrade for our commercial voltage 
regulator product line!  The XC4 is capable of replacing 
other manufacturers' voltage regulators and can fit into 
extremely tight enclosures due to its small size! 
 
The XC4 is designed as a commercial product, ideal 
for installation in standby applications, portable 
generators, residential generators, and any application 
where the customer demands a simple, reliable, and 
durable regulator at a competitive price.   
The Revision A XC4 offers greater value with an 
onboard fuse to protect against overload or external 
faults! 
 
Simplicity and Reliability are important to the Power-
Tronics brand, and all components used in the 
manufacture of our products are high-quality name-
brand and engineered to withstand the continuous 
ratings advertised on our products.  You can have 
confidence with a product designed and manufactured 
in the USA and backed by a factory One-Year 
Warranty! 
 
Based internally on the XR8 voltage regulator, the XC4 
offers precise voltage regulation regardless of the 
connected load and ambient temperature.  It 
incorporates an idle-protection circuit that automatically 
reduces voltage to prevent excessive rotor heating 
when the engine is idled.  
 
The XC4 uses the XR8’s patented electronic circuitry 
that automatically matches the regulator's response 
time to the generator exciter.  This greatly speeds 
installation and eliminates guesswork.  Because it only 
uses 4 wires for connection to the generator, it also 
makes quick replacement in the field possible! 
 
To ensure extreme durability and dependability, the 
XC4 is fully encapsulated in a heat-resistant polyester 
resin.  Because of its strong design and fully 
encapsulated packaging, the XC4 is able to withstand 
extreme operating conditions that would damage most 
other voltage regulators. 
 
The XC4 is a direct upgrade for previous VP4, VP5, 
VR50, and VR250 voltage regulators.

 

 

Specifications 

 

Input Voltage:

   

 

 

120 / 208 or 240vac 

Frequency:

 

 

 

 

50 or 60hz 

Voltage Regulation:

 

 

 

± .75% From NL to FL 

Parallel Operation

 

 

Yes 

Maximum Output Voltage:

 

 

52vdc @ 120vac input 

 

 

 

 

 

105vdc @ 240vac input 

 

Continuous Output Voltage:

 

 

32vdc @ 120vac input 

 

 

 

 

 

63vdc @ 240vac input 

 

Maximum Output Current:

 

 

5adc 

Minimum Field Resistance:

 

 

8Ω @ 32vdc output 

 

 

 

 

 

16Ω @ 63vdc output 

Min Residual Build up Voltage:   

3.5vac 

Under Frequency Protection:

 

 

Yes, Idle speed reduction 

Physical Size:

   

 

 

4.1 x 2.1 x .75 in. 

Weight:  

 

 

 

2.5 oz 

Fully Encapsulated:

 

 

 

Yes 

Internal Fuse Type:

 

 

 

GDB5A @ 250V Fast-Blow 

Remote Voltage Adjustment:

 

 

No 

System Operating Indicator:

 

 

No 

Optional Static Exciter Modules

:   

No 

Optional External Controls

 

No 

XC4 

Commercial Series 

Voltage Regulator 

Revision B 

(From Serial # 625252) 

Summary of Contents for XC4

Page 1: ... heating when the engine is idled The XC4 uses the XR8 s patented electronic circuitry that automatically matches the regulator s response time to the generator exciter This greatly speeds installation and eliminates guesswork Because it only uses 4 wires for connection to the generator it also makes quick replacement in the field possible To ensure extreme durability and dependability the XC4 is ...

Page 2: ...Generator Wiring Diagrams 6 Use with PMGs DPE AUX and Harmonic Winding Generators 7 240V Hookup Connection 8 120V Hookup Connection 9 Installation Considerations 10 Initial Setup and Commissioning 10 Optional Power Tronics Add On Modules 11 Conversion From Shunt Wound to Solid State Regulation 12 Application Troubleshooting 13 Bench Check Procedures 14 Installation Warranty Form 15 Product Warrant...

Page 3: ...greatly simplify setup while offering extreme reliability in demanding service conditions When properly installed the XC4 Automatic 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 it...

Page 4: ...your generator exciter select 120V or 240V Hookup from the list below Exciter Field Resistance 16Ω Exciter Full Load Voltage 63VDC Use 240V Hookup Connection See Page 8 Exciter Field Resistance 8Ω Exciter Full Load Voltage 32VDC Use 120V Hookup Connection See Page 10 Note about Field Resistance When measuring field resistance on a brushless generator simply measure the resistance of the exciter fi...

Page 5: ...ator To determine your full load exciter field voltage use the following formula EExc EGen Conf EGen Output EBattery 2 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 ...

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 XC4 has proprietary filtering circuitry in its sensing stage that is largely unaffected by generator load Becaus...

Page 8: ...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 500VA Connecting the input of the XC4 to 2 different legs of the generator as shown in the diagram below will result in greater regulation accuracy than when connecting line neutral XC4 Commercial Series Automatic Voltage Regulator NOTE I...

Page 9: ... NOT input 277VAC into the XC4 Severe damage to the unit will result For use on 480V systems either connect the regulator to the winding center taps T7 and T0 See Page 6 or use a 480 120V step down transformer rated at 250VA When connecting the input of the XC4 from center tap to neutral of the generator as shown in the diagram always connect AC2 to the generator neutral XC4 Commercial Series Auto...

Page 10: ...ioning 1 Install the regulator and wire up to the correct wiring diagram 240V or 120V 2 If installing the XC4 on a brush type generator verify that the brushes and brush riggings are isolated ungrounded and connected ONLY to the XC4 3 Turn the internal voltage control fully counter clockwise left This procedure is necessary in case the original factory settings have been altered 4 Start up the pri...

Page 11: ...allations For more information on any of the modules below visit our online catalog at www power tronics com ABF10 Automatic Battery Flash Module Adds Automatic Battery Flash to installations with low residual or requiring guaranteed buildup HVD2 High Voltage Disconnect Adds passive protection for your generator and connected equipment from runaway and high voltage conditions Disconnects power to ...

Page 12: ...e the XC4 Automatic 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 13: ...nverter load or defective connection in exciter field 5 Open diode in exciter or shorted rotor in generator 6 Loose or failed 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 wiring configurat...

Page 14: ...t or flickering do not continue this test 6 SLOWLY turn the internal voltage adjustment CW until the incandescent light bulb turns fully on it will be reduced brightness 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 ...

Page 15: ...n 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 Voltage Residual AC Voltage Rated KW Rated KVA Gener...

Page 16: ... 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 Overheating of the power supply resistor s on the printed circuit ...

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