- \n
- Direct Replacement for EMD PN 8330790 Black Box<\/li>\n
- Three-stage Battery Charging<\/li>\n
- Longer Battery Life<\/li>\n
- Reduced Failure to Start Events<\/li>\n
- Faster Charging<\/li>\n
- Reduced Water Consumption<\/li>\n
- Simple Installation<\/li>\n
- Compatible with both AC and DC Aux Generators<\/li>\n<\/ul>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”2_5″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||” _i=”1″ _address=”1.0.1″][et_pb_image src=”https:\/\/www.enerpro-inc.com\/wp-content\/uploads\/2019\/09\/LVR31.jpg” alt=”3-Stage Battery Charger VR31″ align_tablet=”center” align_last_edited=”on|desktop” _builder_version=”3.29.2″ width=”70%” border_width_all=”1px” border_color_all=”rgba(51,51,51,0.09)” box_shadow_style=”preset1″ box_shadow_color=”rgba(0,0,0,0.06)” _i=”0″ _address=”1.0.1.0″][\/et_pb_image][et_pb_text _builder_version=”3.29.2″ global_module=”132709″ _i=”1″ _address=”1.0.1.1″]\n
![\"\"](\"https:\/\/www.enerpro-inc.com\/wp-content\/uploads\/2019\/04\/PDF-icon22h.png\")
\u00a0Product Guide<\/a>
Troubleshooting Guide<\/a>
<\/a>\u00a0Mechanical Drawing<\/a><\/a><\/p>\n<\/a><\/p>\n[\/et_pb_text][et_pb_sidebar area=”et_pb_widget_area_2″ _builder_version=”3.26″ _i=”2″ _address=”1.0.1.2″][\/et_pb_sidebar][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”3.25″ _i=”1″ _address=”1.1″][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||” _i=”0″ _address=”1.1.0″][et_pb_toggle title=”Technical Details” icon_color=”#268ec5″ _builder_version=”3.26.7″ title_text_color=”#000000″ title_font=”||||||||” title_font_size=”20px” body_font=”||||||||” background_color=”#ffffff” custom_padding=”2vw|3vw|2vw|3vw|true|true” border_radii=”on|10px|10px|10px|10px” box_shadow_style=”preset1″ box_shadow_color=”rgba(0,0,0,0.12)” _i=”0″ _address=”1.1.0.0″]Overview<\/strong><\/p>\n
The advent of locomotive automatic engine stop and start systems has brought the benefits of decreased fuel consumption and air emissions but also increased the demands on starting batteries. The much more frequent discharge-charge cycles combined with constant voltage VR10- VR16 voltage regulators has resulted in much shorter battery life, battery plate sulfation, and reduced charge capacity. The operational impact is increased failure to start events and more frequent battery replacements. The VR31 solves these problems by providing battery manufacturer recommended 3-stage battery charging.<\/p>\n
VR31 module
\n<\/strong>The VR31 module is a direct replacement for the VR10-16 series auxiliary generator voltage regulators. Locomotives equipped with the DVR300 voltage regulator require an additional mounting cage and wiring harness adapter for installation. The VR31 uses auxiliary generator voltage feedback, like the VR10, but also uses battery current feedback to provide optimum battery charging. The current sensor provides feedback required to limit current at the start of the charge cycle and to determine when the battery is 95% charged for transition to the float stage. VR31 design incorporates several failure mode protection features that ensure high operational reliability.<\/p>\nShorted PWM Transistor Protection
\n<\/strong>At high engine speed, the auxiliary generator will produce dangerously high voltage if the PWM transistor or the bootstrap transistor becomes shorted or if either transistor is turned on continuously due to a component failure. In this event, an over-voltage comparator trips the panel mounted circuit breaker if the auxiliary generator voltage exceeds the over-voltage trip threshold.<\/p>\nLoss of Current Feedback Protection
\n<\/strong>If the current sensor fails or\u00a0the current\u00a0signal to the VR31 becomes shorted or open, the VR31 immediately transitions to the 72V float voltege.\u00a0A current sensor fault light on the VR31 also lights and\u00a0an output signal is sent to the locomoitve. This fail-safe feature protects the battery from overcharging while still allowing the locomotive to operate until the next maintenance cycle.<\/p>\nEBCS-3 Current Sensor
\n<\/strong>The\u00a0EBCS-3 current sensor\u00a0is installed on the BTN battery cable directly behind the knife switch. By providing isolated battery current feedback to the VR31, the system is able to provide proper charging irregardless of load switching. The EBCS-3 is powered from nominal 74V output of the Auxilliary Generator and has built in failure detection and fail-safe circuitry.<\/p>\nThree-Stage Charge Profile
\n<\/strong>Air pollution regulations and high fuel costs have made locomotive operators shut down idling locomotives much more frequently than in the past. This change in locomotive operation has resulted in premature loss of battery capacity and more frequent cell failure rate. These problems are caused by the single-stage charge profile provided by conventional chargers. With single-stage charging, the initial current immediately after engine start is limited only by generator output and battery circuit resistance. Most locomotive battery charging circuits incorporate a current limiting resistor to reduce the charge current. Even with this resistor, the initial current can greatly exceed the battery manufacturer\u2019s recommended maximum charging current and shorten battery life. The single-stage charger transitions from the high initial first-stage current when the battery voltage rises to reach the nominal voltage setpoint of 74 V. The single-stage charger then maintains constant nominal 74 V on the battery until the engine is shut down. According to battery experts, 74 V is insufficient to convert all of the battery\u2019s active material during the engine run time if the engine is shut down several times per day. The result is a progressive loss of capacity.<\/p>\nThe three-stage charge profile produced by the VR31 regulates the first, or Bulk Stage, current to 90 Amps. In the second, or Absorption Stage, the rectifier voltage is regulated to typically 78 V for an FLA battery and 76V for VRLA. This elevated voltage converts the maximum amount of active battery material while equalizing the charge in each cell, thus minimizing sulfation and capacity loss. In the third, or Float Stage, the VR31 reverts to a constant-voltage regulation mode (nominally 72 V).<\/p>\n
Bulk Stage<\/strong>
\nAfter engine start, the unit enters the 90 A constant-current Bulk Stage. The battery behaves as a capacitor in that the constant charging current results in battery voltage increasing linearly with time. The Bulk Stage ends when the voltage reaches a converter-imposed limit of 78 V (FLA) or 76 V (VRLA).<\/p>\nAbsorption Stage<\/strong>
\nThe constant voltage Absorption Stage begins with the battery charged to about 80% total capacity. The Absorption Stage current decays exponentially with time from the initial 90 A until it reaches one of two Float Stage thresholds. The transition to the Float Stage occurs when one of two conditions are met:<\/p>\n- \n
- The Absorption Stage current decays to typically 25 A, or<\/li>\n
- The total charge reaches approximately 95% capacity.<\/li>\n<\/ol>\n
Forcing the Absorption\/Float transition to occur as a function of charge assures that a shorted cell or other battery defect will not result in continuous operation at elevated voltage.<\/p>\n
Float Stage<\/strong>
\nDuring the regulated 72V Float Stage, the battery current gradually decays to the steady-state self-discharge current. This maintains a full battery charge as long as the engine is running.<\/p>\n![\"\"](\"https:\/\/www.enerpro-inc.com\/wp-content\/uploads\/2019\/08\/3stageVR31.jpg\")
<\/p>\nSystem Block Diagram<\/strong><\/p>\n
![\"\"](\"https:\/\/www.enerpro-inc.com\/wp-content\/uploads\/2019\/08\/3stageVR31-b.jpg\")
<\/strong>
\n[\/et_pb_toggle][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ module_class=”customfooter” _builder_version=”3.26″ background_color=”#2A2A2A” min_height=”458px” custom_padding=”||0px|||” global_module=”131558″ saved_tabs=”all” fb_built=”1″ _i=”3″ _address=”3″][et_pb_row column_structure=”1_5,1_5,1_5,1_5,1_5″ _builder_version=”3.26″ width=”90%” max_width=”1440px” _i=”0″ _address=”2.0″][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”0″ _address=”2.0.0″][et_pb_text module_id=”customfoot” _builder_version=”3.29.2″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.0.0.0″]\nUNITED STATES<\/h4>\n
Enerpro, Inc.
Global Headquarters
99 Aero Camino
Goleta, CA 93117<\/p>\ninfo@enerpro-inc.com<\/a>
https:\/\/www.enerpro-inc.com<\/a><\/p>\nToll Free: (877) 648-2114
Tel: (805) 683-2114
Fax: (805) 964-0798<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”1″ _address=”2.0.1″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.0.1.0″]\nCANADA<\/h4>\n
ICT Power Company Inc.
1220 Corporate Dr.
Burlington, ON L7L 5R6
Canada<\/p>\nsales@ictpower.com<\/a>
http:\/\/www.ictpower.com<\/a><\/p>\nTel: 905.631.8494
Fax: 905.631.8495<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”2″ _address=”2.0.2″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.0.2.0″]\nMEXICO<\/h4>\n
Electronica Integral De Puebla, SA DE CV
Jose Guadalupe Posada 1413\u00a0col. Satelite
Puebla, Pue. 72320
Mexico<\/p>\nventas@eipsamex.com<\/a>
eipsamex@yahoo.com.mx<\/a>
http:\/\/www.eipsamex.com
<\/a>Tel: +52 (222) 2343406
Fax: +52 (222) 2344205<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”3″ _address=”2.0.3″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.0.3.0″]\nUNITED KINGDOM<\/h4>\n
Andrew Chettle
Power Products International Limited
Commerce Way
Edenbridge
Kent TN8 6ED<\/p>\nsales@ppi-uk.com
<\/a>http:\/\/www.ppi-uk.com<\/a>
Tel: 01732 866424
Fax: 01732 866399<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”4″ _address=”2.0.4″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.0.4.0″]\nITALY, SLOVENIA, SLOVAKIA, CZECH REPUBLIC<\/h4>\n
Bruno Passerini
G.P.S. \u2013 Green Power Solutions SRL
Via Venezia 34D
10088 Volpiano \u2013 Torino
Italy<\/p>\ninfo@gpsemi.it<\/a>
http:\/\/www.gpsemi.it<\/a>
Tel: +39 011 9882251
Fax: +39 011 9881358<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_5,1_5,1_5,1_5,1_5″ _builder_version=”3.26.6″ width=”90%” max_width=”1440px” _i=”1″ _address=”2.1″][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”0″ _address=”2.1.0″][et_pb_text module_id=”customfoot” _builder_version=”3.29.2″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.6em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.1.0.0″]\nTECHNICAL SUPPORT<\/h4>\n
Design Support
\nIn-Service Support
\nToll Free: (877) 648-2114
\n(805) 683-2114
\nsupport@enerpro-inc.com<\/a><\/p>\nSales Policy<\/a>
\nRMA Policy<\/a>[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”1″ _address=”2.1.1″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.1.1.0″]\nSCANDINAVIA<\/h4>\n
MPE Cathodic AS
P. O. Box 74
N1581 Rygge, Norway
Marine & Offshore
Jotun ICCP Specialists<\/p>\nemil@mpecathodic.no<\/a>
roy@mpecathodic.no<\/a>
http:\/\/www.mpecathodic.no<\/a>
Tel: +47 69 23 29 00
Fax: +47 69 23 29 01
Mob: +47 95 11 81 82<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”2″ _address=”2.1.2″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.1.2.0″]\nSOUTH AMERICA<\/h4>\n
Andes Controls, Power and Automation
Cristi\u00e1n Ladisla Bohn
Av. Holanda 099, Oficina 1101
Providencia, Santiago, Chile<\/p>\ncontact@andescpa.com<\/a>
http:\/\/andescpa.com\/<\/a>
Tel: +56 2 2306 6202<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”3″ _address=”2.1.3″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.1.3.0″]\nTHAILAND, MALAYSIA, VIETNAM, PHILIPPINES<\/h4>\n
Akom Chantakhun
CBC International Limited
56\/12-13 Soi Prayasuren 45
Samwatawantok, Klongsamwa
Bangkok, 10510
Thailand<\/p>\nakom@cbcinter.co.th<\/a>
http:\/\/www.cbcinter.com<\/a>
http:\/\/www.cbcinter.co.th
<\/a><\/strong><\/strong>Tel: 662 902 6106-9
Fax: 662 914-3009<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_5″ _builder_version=”3.26″ _i=”4″ _address=”2.1.4″][et_pb_text module_id=”customfoot” _builder_version=”3.27.4″ text_text_color=”#ffffff” text_font_size=”13px” text_line_height=”1.9em” header_4_text_color=”#ffffff” header_4_font_size=”16px” header_4_line_height=”1.2em” _i=”0″ _address=”2.1.4.0″]\nHONG KONG, MACAU, CHINA (PRC)<\/h4>\n
Jane Lu
Bonning Asia Co., Ltd
Room 1604, Arion Commercial Centre
2-12 Queen\u2019s Road, West
Hong Kong<\/p>\njanelu2000@yahoo.com<\/a>
http:\/\/www.shjdn.com<\/a>
Tel: 852 2543 0186
Fax: 852 2542 2114
Mob: 852 9379 8172<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"Enerpro\u2019s LVR31 3-Stage Charge Auxiliary Generator Voltage Regulator is a direct replacement for the EMD PN 8330790 “Black Box”\u00a0 voltage regulator used on pre-Dash 2 locomotives. The LVR31 extends battery life and reduces dead won’t starts by providing the battery manufacturer recommended three-stage battery charging profile.\u00a0 Additional benefits include reduced idling from faster charging and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":29731,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"yoast_head":"\n
LVR31 Three Stage Charge Regulator - Enerpro-Inc Power Electronics<\/title>\n<meta name=\"description\" content=\"LVR31 Three Stage Charge Regulator\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.enerpro-inc.com\/locomotive-and-rail-products\/lvr31-three-stage-charge-regulator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LVR31 Three Stage Charge Regulator - Enerpro-Inc Power Electronics\" \/>\n<meta property=\"og:description\" content=\"LVR31 Three Stage Charge Regulator\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.enerpro-inc.com\/locomotive-and-rail-products\/lvr31-three-stage-charge-regulator\/\" \/>\n<meta property=\"og:site_name\" content=\"Enerpro-Inc Power Electronics\" \/>\n<meta property=\"article:modified_time\" content=\"2019-09-18T19:17:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.enerpro-inc.com\/wp-content\/uploads\/2019\/04\/PDF-icon22h.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.enerpro-inc.com\/locomotive-and-rail-products\/lvr31-three-stage-charge-regulator\/\",\"url\":\"https:\/\/www.enerpro-inc.com\/locomotive-and-rail-products\/lvr31-three-stage-charge-regulator\/\",\"name\":\"LVR31 Three Stage Charge Regulator - 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