Power-Tronics XR8 - User Manual

To Next Page

XR8

Professional Series

Universal Voltage Regulator

REVISION A (or later)

The Power-Tronics XR8 Universal Voltage

Regulator is the latest upgrade for all UVR and

XR series voltage regulators and features an

upgraded regulation system and a higher

amperage rectifier section capable of 8 amps!

The XR8 is also capable of replacing other

manufacturers' voltage regulators and has

optional Static Exciter Modules to boost its

capacity to 30 amps DC!

The XR8 is designed specifically for Professional

Electrical Generator Service Technicians and

the Electrical Generator Repair Industry. It

incorporates an easily selectable frequency

range for voltage roll-off during under-frequency

operation and offers precise voltage regulation

regardless of the connected load and ambient

temperature. The XR8 is a ruggedized design

and is engineered to provide a lifetime of

trouble-free, reliable operation.

Manual stability matching is a thing of the past,

the XR8 contains patented electronic circuitry

that automatically matches the regulator's

response time to the generator exciter. This

greatly speeds installation and eliminates

guesswork.

PLC and automated Genset control is possible

with the XR8 by simply adding an optional,

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 compatible with all previous and

current optional modules available for use with

Power-Tronics voltage regulators making it

extremely simple to upgrade an existing voltage

regulator installation.

Specifications

Input Voltage: 120 / 208 or 240vac

Frequency: 50 or 60hz

Voltage Regulation: ± .25% From NL to FL

Parallel Operation Yes

Maximum Output Voltage: 52vdc @ 120vac input

105vdc @ 240vac input

210vdc @ 240vac input

Continuous Output Voltage: 32vdc @ 120vac input

63vdc @ 240vac input

125vdc @ 240vac input

Maximum Continuous Output: 8adc

Minimum Field Resistance: 6.5Ω @ 32vdc output

13Ω @ 63vdc output

26Ω @ 125vdc output

Min Residual Build up Voltage: 3.5vac

Under Frequency Protection: Yes, VPH reduction

Physical Size: 4.75 x 6 x 1 in.

Weight: 7 oz

Repairable: Yes

Internal Protection: Fuses, cartridge type

External Voltage Adjustment: Yes

System Operating Indicator: Yes

Optional Static Exciter Modules: Yes

Optional External Controls: Yes

Cartridge Fuse Type: 3AG 10A @ 250V Fast-Blow

Optional External Potentiometer: 100KΩ @ 2W

External Adjustment Range: ±10% of Terminal Voltage

Need help?

Do you have a question about the Power-Tronics XR8 and is the answer not in the manual?

The Power-Tronics XR8 Universal Voltage Regulator is a professional series device designed for electrical generator service technicians and the electrical generator repair industry. It is an upgraded version of all UVR and XR series voltage regulators, featuring an enhanced regulation system and a higher amperage rectifier section capable of delivering up to 8 amps. The XR8 can also replace other manufacturers' voltage regulators and offers optional Static Exciter Modules to boost its capacity to 30 amps DC.

Function Description

The XR8 is engineered to provide reliable, clean, and regulated electricity. It performs several automated tasks:

Generator Build-up: It builds up generators with residual voltages from 3.5VAC without initial overshoot or excessive delay, thanks to a time-proven, reliable circuit in use for over 25 years.
Voltage Regulation: It precisely regulates the terminal voltage of the generator within +/- 0.25% of its initial set point, regardless of the connected load and ambient temperature. Patented circuitry automatically matches the regulator's response time to the generator exciter, simplifying installation and eliminating guesswork.
Protection: It protects itself and the generator from fault situations. It uses field-replaceable 3AG ceramic cartridge fuses to protect internal circuitry if the exciter field current exceeds the regulator's capacity. A unique frequency-selectable Volts-Per-Hertz circuit helps turbocharged engines accept large loads and protects the generator rotor and exciter if the engine idles with the regulator energized.

The XR8 is configurable for three different output ranges, making it suitable for a wide range of generators. It supports PLC and automated Genset control through an optional digital interface module, making it suitable for automated, unattended installations, or large-scale parallel operations.

Important Technical Specifications

Input Voltage: 120/208 or 240VAC
Frequency: 50 or 60Hz (User Selectable)
Voltage Regulation: ±0.25% From No-Load to Full-Load
Parallel Operation: Yes
Maximum Output Voltage:
- 52VDC @ 120VAC input
- 105VDC @ 240VAC input
- 210VDC @ 240VAC input
Continuous Output Voltage:
- 32VDC @ 120VAC input
- 63VDC @ 240VAC input
- 125VDC @ 240VAC input
Maximum Continuous Output Amperage: 8ADC
Minimum Field Resistance:
- 6.5Ω @ 32VDC output
- 13Ω @ 63VDC output
- 26Ω @ 125VDC output
Minimum Residual Build-up Voltage: 3.5VAC
Under Frequency Protection: Yes, VPH reduction
Physical Size: 4.75 x 6 x 1 inches
Weight: 7 oz
Internal Protection: Fuses, cartridge type
Cartridge Fuse Type: 3AG 10A @ 250V Fast-Blow
External Adjustment Range: ±10% of Terminal Voltage (with 100KΩ @ 2W potentiometer)

Usage Features

Ease of Setup: The XR8 simplifies installation with automated stability matching and easily selectable frequency ranges.
Configurable Connections: It supports three main hookup configurations (A, B, C) based on the generator's exciter field voltage, resistance, and amperage, ensuring optimal regulation and response time.
- Connection A: Full-Wave rectified, 125VDC @ 8A continuous output with 240VAC input. Used for higher voltage excitation fields (125V fields) or shunt control fields > 63VDC. Maximum input voltage is 240VAC.
- Connection B: Half-Wave rectified, 63VDC @ 8A continuous output with 240VAC input. Used for most brushless generator excitation fields (63V fields) or shunt control fields > 32VDC and ≤ 63VDC. Maximum input voltage is 240VAC.
- Connection C: Half-Wave rectified, 32VDC @ 8A continuous output with 120VAC input. Used for low voltage excitation fields (32V fields) or shunt control fields < 32VDC. Maximum input voltage is 139VAC.
Parallel Configuration: Supports parallel operation with other generators or utility buss using Reactive Droop compensation. Includes setup tips for isolation transformers, CT sizing, and reactive droop resistor adjustment.
Compatibility: Compatible with PMG (Permanent Magnet Generator/Exciter) and DPE/Auxiliary Winding generators. Not compatible with Harmonic/Resonant Winding generators.
External Controls: Supports external voltage adjustment and optional external potentiometers.
Add-On Modules: A wide array of optional modules are available, including:
- SEM250A/B Static Exciter Modules: Convert the XR8 into a 63VDC or 125VDC 25ADC Static Exciter.
- AFM5X Automatic Flash Module: Adds automatic or battery flash for installations with low residual or requiring guaranteed buildup.
- EIC1020 External Interface Card: Allows external control by digital load-sharing controllers, VAR controllers, genset controllers, or digital governor controllers.
- MOP1224HD Motorized Potentiometer: Enables external control by older automated controllers using pulsed signals or dry contacts.
- HVD2 High Voltage Disconnect: Adds passive protection against runaway and high voltage conditions.
Shunt-Wound Conversion: Provides instructions for converting older Shunt-Wound exciters with manual, mechanical, or series solid-state voltage regulators to work with the XR8.

Maintenance Features

Repairable Design: Unlike many encapsulated regulators, the XR8 is fully repairable. All major electronic components are not encapsulated, facilitating repair, while sensitive components are encapsulated for protection from contamination and moisture.
Field-Replaceable Fuses: Uses standard 3AG ceramic cartridge fuses for internal circuit protection, which are easily replaced.
Troubleshooting Guide: The manual includes a comprehensive application troubleshooting guide with common problems and possible causes (e.g., No Voltage, Pulsating Voltage, High Voltage, Poor Voltage Regulation).
Bench Check Procedures: Detailed steps are provided for bench testing the regulator to verify functionality and identify internal faults.
Warranty: Power-Tronics, Inc. offers a 3-year warranty on parts and workmanship from the original purchase date. The warranty is voided by conditions such as overheating, physical damage, unauthorized repair, improper installation, conductive/corrosive contamination, removal of identification, or failure to complete the installation warranty form.