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© 2020 Power-Tronics, Inc. 

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Current Transformer Wiring Diagram  

For Paralleled Generators 

 

To use the XC14

 

Voltage regulator in a parallel configuration either with another 

generator or with a buss such as a utility, use the diagram below for proper hookup with 
the XC14.  

Power and field wiring is shown on Pages 8-10.

 

 

 

This diagram assumes a paralleled operating environment 

with manual remote adjustment.

 

 

NOTE:

  

Power-Tronics products parallel using the Reactive Droop compensation method.  This allows 

our products to parallel with existing systems easily while also allowing islanded operation with the flip of 
a switch.  

When initially installing the droop resistor, set it for approximately 7Ω before final 

adjustment later.

  If the droop is excessive when load testing, reduce the resistance a bit at a time until 

satisfactory droop is achieved.  

CT should be sized at 25-35VA capacity!

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

xxx/5a CT 

25-35VA 

Unit/Parallel 

Switch 

Reactive Droop 

Adjustment 

10Ω, 100W 

If using the 

internal 0-10VDC 

Interface module, 

See Pages 12-13 

for Control Wiring 

Diagrams

 

NOTE: 

Don’t Omit Remote 

Adjustment on a 

Paralleled Generator!!! 

100KΩ @ 2w

 

Summary of Contents for 624893

Page 1: ...ize failures and potential downtime The XC14 are capable of parallel operation with other generators or with a utility buss The integrated 0 10VDC or 4 20mA interface allows a wide variety of VAR PF or other PLC controls to remotely control the unit for extreme accuracy and unattended installations A heavy duty rectifier section oversized heatsink and flexible hookup design makes the XC14 an ideal...

Page 2: ...tion Diagram 8 240V Input Power Field Connection Diagram 9 277V Input Power Field Connection Diagram Line Neutral 10 Current Transformer Wiring Diagram Paralleled Generators 11 Fully Automatic Remote Adjustment Wiring Diagram 12 Automatic Manual Selectable Remote Adjustment Wiring Diagram 13 Initial Setup and Commissioning 14 Application Troubleshooting 15 Bench Check Procedures 16 Installation Wa...

Page 3: ...n give a false reading Functional Description The XC14 Voltage regulator is the result of over 30 years of engineering efforts and offers high demand features at a competitive price point The XC14 is a time and field proven design based upon the Power Tronics XR8 and SEM250A and is engineered to greatly simplify setup while offering extreme reliability When properly installed the XC14 Voltage regu...

Page 4: ...ained from your generator exciter verify that your generator fits the specifications below Exciter Field Resistance 2 5Ω Exciter Full Load Voltage 32VDC Use 120V Connection See Page 8 Exciter Field Resistance 5Ω Exciter Full Load Voltage 63VDC Use 240V Connection See Page 9 or 277V Connection See Page 10 WARNING BRUSH AND SLIP RING CONNECTION PROBLEMS ARE THE 1 SOURCE OF VOLTAGE CONTROL PROBLEMS A...

Page 5: ...ng to determine your exciter specs please see the section below for instructions on measuring and calculating your exciter specifications Measure your exciter field resistance using a multimeter on your field leads Record this value If you have a brush type generator also take a resistance reading on your slip rings the value you obtain on the slip rings should be no more than 1 difference from th...

Page 6: ...tage 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 this connection ...

Page 7: ... Voltage U W 208 240V Voltage U N 120 139V NOTE 208V is Standard Voltage Series Delta 240V 3ø Voltage U W 240V Voltage U W N 120V Voltage V N 208V NOTE V N is a High Leg 208V instead of 120V Double Delta 120 240V 1ø Voltage U W 240V Voltage U W N 120V Preferred Single Phase Connection Don t Use Zig Zag if Possible NOTE Derate generator by 1 3 rated capacity when using this connection ...

Page 8: ...at 1KVA or connect the regulator to the winding center taps T7 and T0 See Pages 6 and 7 Using a transformer to connect the input of the XC14 to 2 different phases of the generator will result in greater regulation accuracy than when connecting line neutral Diagram Assumes a 208 240V Generator For 480V Generators use a 1KVA or larger Transformer with a 120V Secondary OR Connect to the Generator win...

Page 9: ...rated at 1 5KVA or connect the regulator to the winding center taps T7 and T9 See Pages 6 and 7 Connecting the input of the XC14 to 2 different phases of the generator will result in greater regulation accuracy than when connecting line neutral Diagram Assumes a 208 240V Generator For 480V Generators use a 1 5KVA or larger Transformer with a 240V Secondary OR Connect to the Generator winding cente...

Page 10: ...ulation problems or damage to the unit may result For use on 480V systems connect the regulator from Line to Neutral T7 and T0 See Pages 6 and 7 or use a 480 240V step down transformer rated at 1KVA Diagram Assumes a 480V Generator For other voltages use a 1KVA or larger Transformer with a 240V Secondary NEVER install a switch or breaker on the DC or Exciter side of the voltage regulator Only inst...

Page 11: ...ve Droop compensation method This allows our products to parallel with existing systems easily while also allowing islanded operation with the flip of a switch When initially installing the droop resistor set it for approximately 7Ω before final adjustment later If the droop is excessive when load testing reduce the resistance a bit at a time until satisfactory droop is achieved CT should be sized...

Page 12: ...am This wiring diagram shows ONLY the control wiring configuration for fully automatic Remote Control of the XC14 Power wiring is shown on Pages 8 10 0 10VDC or 4 20mA Control Signal NOTE Colored Wires are for ease of identification in this drawing only they are not required ...

Page 13: ... ONLY the control wiring configuration for fully automatic Remote Control of the XC14 Power wiring is shown on Pages 8 10 0 10VDC or 4 20mA Control Signal NOTE Colored Wires are for ease of identification in this drawing only they are not required 100KΩ 2w DPDT Switch or Relay Switch Position Automatic é Manual ê ...

Page 14: ... screw clockwise right Note that the voltage adjustment is a 25 turn pot 9 Place the generator on line and observe the frequency and voltage 10 If the generator is being paralleled measure the droop during loading and adjust the droop resistor as necessary Reducing droop resistor resistance will reduce droop NOTE Loading the generator with a purely resistive load bank may cause undesirable droop c...

Page 15: ... voltage regulator 7 Loose wiring connections 8 Input voltage to regulator is too low 9 Exciter field is grounded 10 Non linear load or wrong selection for regulator hookup 11 Exciter fields are reversed 12 Wrong selection of regulator wiring configuration 13 Defective voltage regulator 14 SCR or Inverter drive effecting generator waveform 15 Regulator needs battery flashing circuit 16 Isolation t...

Page 16: ...age adjustment Clockwise Right until the light glows The test light should light to HALF Brightness NOTE It may take several turns of the adjustment screw before the lights illuminate 7 Slowly turn the internal voltage adjustment Counter Clockwise Left until the lights go dark The test light should be OFF NOTE It may take several turns of the adjustment screw before the lights go dark 8 Turn off A...

Page 17: ...blem 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 Voltage Residual AC Voltage Rated KW ...

Page 18: ...e 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 Overheating of the power supply resistor on...

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