Control Circuit Transformers Tech Data
Technical DataControl Circuit TransformersBulletin Numbers 1497, 1497A, 1497B, 1497DTopicPage1497 Control Circuit Transformer41497A Machine Tool Transformer91497B Control Power Transformer141497D General Purpose Transformer19Additional ResourcesThese documents contain additional information concerning related products from Rockwell Automation.ResourceDescriptionIndustrial Automation Wiring and Grounding Guidelines, publication 1770-4.1Provides general guidelines for installing a Rockwell Automation industrial system.Product Certifications website, http://www.ab.comProvides declarations of conformity, certificates, and other certification details.You can view or download publications at http://www.rockwellautomation.com/literature/. To order paper copies oftechnical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.
1497 Control Circuit FeaturesOutput Power14971497A1497B1497DControl Circuit TransformerMachine Tool TransformerControl Power TransformerGeneral Purpose Transformer Single, dual, and multi-tapprimary voltages Single phase EN 60-529 finger-safeprotection RoHS compliant 50/60 Hz, 50 Hz, or 60 Hz Optional Fusing Dual/Multi-tapRoHS compliantSingle phase50/60 HzOptional Fusing Dual/Multi-tapRoHS compliantSingle phase60 Hz onlyOptional Fusing Indoor/outdoor non-ventilatedenclosure Single phase Exceeds requirements of theUniform Building Code (UBC)and California Code Title 24 Copper windings provided forall transformers rated 2 kVAand below Aluminum windings providedfor all transformers rated 2 kVAand above NEMA Type 3R ratedenclosures 50/60 HZ or 60 Hz63 2000VA50 3000VA50 3000VA0.05 25 kVAInput Voltage/Primary Voltage208 600V220 550 (50 Hz)208 575V (50/60 Hz)120 600V208 600VOutput Voltage/Secondary Voltage24 120V24 230V (50 Hz)24 120V (50/60 Hz)24 240V120 240VInsulationCertificationsStandardsPage63 2000VA — Class 130 C(55 80 C temp. rise)50 150VA — Class 105 C (55 C temp. rise)200 1500VA — Class 130 C (80 C temp. rise)2000 3000VA — Class 180 C (100 C temp. rise)Class 180 C (115 C temp. rise)cULus, CEcULuscULusUL, CSACSA C22.2 No. 66.1, EN 61558,UL 5085-1, 5085-2CSA C22.2 No. 66.1,UL 5085-1, 5085-2CSA C22.2 No. 66.1,UL 5085-1, 5085-2CSA C22.2 No. 47 — M90,UL 1561Page 4Page 9Page 14Page 19Rockwell Automation Publication 1497-TD001A-EN-P3
1497 Control Circuit TransformersSpecificationsBulletin 1497 — Global Control Circuit TransformersCat. No. 1497-B-HXJX-3-NControl Circuit Transformer, 3poleFuse Block with OptionalCat. No. 1491-R150 Fuse CoverBulletin 1497 Global Control Circuit Transformers are designed toreduce supply voltages to control circuits. The complete line oftransformers is available with optional factory-installed or panel-mountprimary and secondary fuse block. A dual primary and secondary fuseblock is pre-wired and mounted on top of the transformer up to500VA. 63 2000VA Single, dual, and multi-tap primary voltages Single phase EN 60-529 finger-safe protection RoHS compliantStandards ComplianceUL 5085-1, UL 5085-2EN61558CSA C22.2 No. 66.1CertificationscULus Listed (File No. E52057;Guide No. XPTQ, XPTQ7)CECat. No. 1497-C-BASX-0-NControl Circuit Transformer,Non-FusedCatalog Number ExplanationBulletin 1497 Multi-Tap Transformers1497 – A – M1 – 3 – NabcdabcVA RatingPrimary and Secondary VoltageFuse Block Options§CodeDescription [VA]CodePrimarySecondaryCodeBlock OptionsA63M1240V, 208V120V (60 Hz)00 Primary, 0 SecondaryB80M2240V, 208V24V (60 Hz)10 Primary, 1 SecondaryC130M3240V, 208V24V, 120V (60 Hz)22 Primary, 0 SecondaryD200M4415V, 400V, 380V115X230V (50 Hz)32 Primary, 1 SecondaryE250M5415V, 400V, 380V24V (50 Hz)F350G500H750J800K1000L1600M2000dFactory Installed OptionsCodeDescriptionNNo Fusing, No CoverBulletin 1497 Transformers1497 – A – BADX – 3 – NabcdabcVA RatingPrimary and Secondary VoltageFuse Block Options§CodeDescription [VA]CodePrimarySecondaryCodeBlock OptionsA63HX208V (60 Hz)—00 Primary, 0 SecondaryAX240V (60 Hz),220V (50 Hz)—10 Primary, 1 Secondary22 Primary, 0 SecondaryBA1240X480V (60 Hz),220X440V (50 Hz)—32 Primary, 1 SecondaryCX 600V (60 Hz),550V (50 Hz)—B80C130D200E250F350G500DX‡—120V (60 Hz)H750JX—24V (60 Hz)J800K1000SX—120V (60 Hz),110V (50Hz)JK—24V (50 Hz),26V (60 Hz)L1600M2000dFactory Installed OptionsCodeDescriptionNNo Fusing, No Cover1 When the primary voltage code BA is selected and a 120V AC secondary is desired, the secondary voltage code SX should be selected. VA rating codes G, H, or J with primary voltage over 500V have only cULus approval.‡ Not available for use with primary voltage code BA.§ VA rating codes H M are only available with no fuse block option (0).4Rockwell Automation Publication -1497-TD001A-EN-P
1497 Control Circuit TransformersSpecificationsSelecting a Control Circuit TransformerFor proper transformer selection, three characteristics of the loadcircuit must be determined in addition to the minimum voltagerequired to operate the circuit. These are total steady-state (sealed)VA, total inrush VA, and inrush load power factor. Total steady-state (sealed) VA is the volt-amperes that thetransformer must deliver to the load circuit for an extended periodof time — the amount of current required to hold the contact in thecircuit. Total inrush VA is the volt amperes that the transformer mustdeliver upon initial energization of the control circuit. Energizationof electromagnetic devices takes 30 50 milliseconds. During thisinrush period, the electromagnetic control devices draw manytimes normal current — 3 10 times normal is typical. Inrush load power factor is difficult to determine without detailedvector analysis of all the load components. Such an analysis isgenerally not feasible. Therefore, a safe assumption is 40% powerfactor.Typical Magnetic Motor Starter and Contactor Data 60 Hz,120 Volt, 3-PoleNEMA 929456996VASealedBulletin 500Selection Process1. Determine the total inrush VA of the control circuits from the tablebelow. Do not neglect the current requirements of indicating lightsand other devices that do not have an inrush VA but are reenergized at the same time as the other components in thecircuit. Their total VA should be added to the total inrush VA.2. Refer to the table below, Regulation Data — Inrush VA. If thesupply circuit voltage (Step 1) is reasonably stable and fluctuatesnot more than 5%, refer to the 90% secondary voltage column.If it fluctuates as much as 10%, refer to the 95% secondaryvoltage column. Go down the column selected until at the inrushVA closest to, but not less than, the inrush VA of the controlcircuit.3. Read to the far left side of the chart. The transformer’scontinuous nominal VA rating is now selected. The secondaryvoltage that will be delivered under inrush conditions will be either85%, 90%, or 95% of the rated secondary voltage, depending onthe column selected from the table below, Regulation Data —Inrush VA. The total sealed VA of the control circuit must notexceed the nominal VA rating of the transformer selected from thetable below, Typical Magnetic Motor Starter and Contactor Data60 Hz, 120 Volt, 3-Pole.4. Refer to the specification tables on the following pages to selecta transformer according to the required continuous nominal VA,and primary and secondary voltage combinations.Regulation Data — Inrush VAPower FactorAdjustmentsInrush VA at 40% Power FactorNominalVA Rating85%90%95%PowerFactorMultiply 100——Rockwell Automation Publication 1497-TD001A-EN-P5
1497 Control Circuit TransformersSpecificationsFuse Sizing ChartsImportant: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code.Primary Fuse Sizing Chart (When Only Primary Protection is Used)Maximum Amp Rating for Current Limiting Fuses Based on Transformer Primary Voltage and the National Electrical 432000121113129888766654Primary Fuse Sizing Chart (When Primary and Secondary Protection is Used)Maximum Amp Rating for Current Limiting Fuses Based on Transformer Primary Voltage and the National Electrical 11010998876520002020201814121212101010987Secondary Fuse Sizing ChartMaximum Amp Rating for Current Limiting Fuses Based on the National Electrical 2512Rockwell Automation Publication -1497-TD001A-EN-P
1497 Control Circuit TransformersSpecificationsDimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.Transformer without FusingTransformer with Fuse Holder and CoversApproximate Shipping Wt. — lb (kg)VAABCDEFGHJKWithoutTop-MountedFuse 24)Transformer with Fuse Holder and Covers2-Pole Primary and1-Pole SecondaryTop-Mounted Fuse BlockTransformer without FusingApproximate Shipping Wt. — lb (kg)VAABCDEFGHJKWithoutTop-MountedFuse )13-2/5(6.08)13-4/5(6.26)Rockwell Automation Publication 1497-TD001A-EN-P2-Pole Primary and1-Pole SecondaryTop-Mounted Fuse Block7
1497 Control Circuit TransformersSpecificationsDimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.Transformer without FusingTransformer with Fuse Holder and CoversApproximate Shipping Wt. — lb ntedFuse Block17-3/5(7.98)K5-15/16(150.62)2-Pole Primary and1-Pole SecondaryTop-Mounted Fuse Block17-19/20(8.14)Transformer without FusingApproximate Shipping Wt. — lb (kg)VAABCDEFGHWithout Top-Mounted Fuse )5-11/64(149.86)7-1/16(172.47)61(27.67)8Rockwell Automation Publication -1497-TD001A-EN-P
1497 Control Circuit TransformersSpecificationsBulletin 1497A — Machine Tool TransformersBulletin 1497A Machine Tool Transformers are designed to reducesupply voltages to control circuits. The complete line of transformers isavailable with optional factory-installed or panel-mount primary andsecondary fuse block/clip. 50 3000VA (50/60 Hz) RoHS compliant Single phase Epoxy encapsulatedStandards ComplianceUL 5085-1, UL 5085-2CSA C22.2 No. 66.1CertificationscULus Listed (File No. E52057;Guide No. XPTQ, XPTQ7)Catalog Number ExplanationBulletin 1497A Machine Tool Transformers1497A – A1 – M6 – 0 – NabcdabcVA RatingPrimary and Secondary VoltageFuse Block Options CodeDescription 0V,230X460V,240X480VSecondary110, 115, 120V(50/60 Hz)M7230/460/575V115/95V (50/60 Hz)M8208/277/380V115/95V (50/60 Hz)dM18208/230/480V(50/60 Hz)120/24V (50/60 Hz)Factory Installed OptionsM19240X480V(50/60 Hz)48V (50/60 Hz)CodeBlock Options00 Primary, 0 Secondary10 Primary, 1 Secondary32 Primary, 1 SecondaryCodeDescriptionNNo TapsNote: For complete list of valid transformer configurations, see Product Selection. Transformers rated 350VA and below use secondary fuse clips. Transformers rated 500VA and above use secondary fuse blocks.Rockwell Automation Publication 1497-TD001A-EN-P9
1497 Control Circuit TransformersSpecificationsSelecting a Machine Tool TransformerSelection Process Total steady-state (sealed) VA is the volt-amperes that thetransformer must deliver to the load circuit for an extended periodof time — the amount of current required to hold the contact in thecircuit. Total inrush VA is the volt amperes that the transformer mustdeliver upon initial energization of the control circuit. Energizationof electromagnetic devices takes 30 50 milliseconds. During thisinrush period, the electromagnetic control devices draw manytimes normal current — 3 10 times normal is typical. Inrush load power factor is difficult to determine without detailedvector analysis of all the load components. Such an analysis isgenerally not feasible. Therefore, a safe assumption is 40% powerfactor.For proper transformer selection, three characteristics of the loadcircuit must be determined in addition to the minimum voltagerequired to operate the circuit. These are total steady-state (sealed)VA, total inrush VA, and inrush load power factor. Total steady-state (sealed) VA is the volt-amperes that thetransformer must deliver to the load circuit for an extended periodof time — the amount of current required to hold the contact inthe circuit. Total inrush VA is the volt amperes that the transformer mustdeliver upon initial energization of the control circuit. Energizationof electromagnetic devices takes 30 50 milliseconds. During thisinrush period, the electromagnetic control devices draw manytimes normal current — 3 10 times normal is typical. Inrush load power factor is difficult to determine without detailedvector analysis of all the load components. Such an analysis isgenerally not feasible. Therefore, a safe assumption is 40% powerfactor.1. Determine the total inrush VA of the control circuits from the tablebelow. Do not neglect the current requirements of indicating lightsand other devices that do not have an inrush VA but are reenergized at the same time as the other components in thecircuit. Their total VA should be added to the total inrush VA.3. Read to the far left side of the chart. The transformer’scontinuous nominal VA rating is now selected. The secondaryvoltage that will be delivered under inrush conditions will be either85%, 90%, or 95% of the rated secondary voltage, depending onthe column selected from the table below, Regulation Data —Inrush VA. The total sealed VA of the control circuit must notexceed the nominal VA rating of the transformer selected from thetable below.4. Refer to the specification tables on the following pages to selecta transformer according to the required continuous nominal VA,and primary and secondary voltage combinations.Regulation Data — Inrush VANominalVA Rating85%90%95%PowerFactorMultiply 00016941136609484——3000256802018013797——2. Refer to the table below, Regulation Data — Inrush VA. If thesupply circuit voltage (Step 1) is reasonably stable and fluctuatesnot more than 5%, refer to the 90% secondary voltage column.If it fluctuates as much as 10%, refer to the 95% secondaryvoltage column. Go down the column selected until at the inrushVA closest to, but not less than, the inrush VA of the controlcircuit.10Power FactorAdjustmentsInrush VA at 40% Power FactorRockwell Automation Publication -1497-TD001A-EN-P
1497 Control Circuit TransformersSpecificationsFuse Sizing ChartsImportant: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code.Primary Fuse Sizing Chart (When only primary protection is used)Maximum Amp rating for current limiting Class C fuses based on transformer primary voltage and the National Electrical .750.751.125 y Fuse Sizing Chart (When primary and secondary protection is used)Maximum Amp rating for current limiting fuses based on transformer primary voltage and the National Electrical 1.251.125 60.6200442.52.252221.81.251.251.125 5151515121212Secondary Fuse Sizing ChartMaximum Amp rating for current limiting midget fuses based on the National Electrical �——4540404035202020Rockwell Automation Publication 1497-TD001A-EN-P11
1497 Control Circuit TransformersSpecificationsDimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.Transformer with 2 Primary Fuse Blocksand 0 or 1 Secondary Fuse Block/Clip(Top View)Transformer with 0 Primary Fuse Blocksand 0 or 1 Secondary Fuse Block/Clip(Top View)Transformer with 2 Primary Fuse Blocksand 1 Secondary Fuse Block/Clip(Side View)Transformer with 2 Primary Fuse Blocksand 1 Secondary Fuse Block/Clip(Side View)Transformer with 0 Primary Fuse Block andSecondary Fuse Block/Clip(Side View)Transformer with 0 Primary Fuse Blocksand 1 Secondary Fuse Block/Clip(Side View)VACat. No.A1497A-A1-M6- -N3-25/32(96)1-31/32(50)4-1/32(102)2-1/5 (56)1497A-A1-M7- -N501497A-A1-M8- -N1497A-A1-M18- -N4-17/32(115)1497A-A1-M19- -N3-25/32(96)1497A-A2-M6- -N4-1/32(102)1497A-A2-M8- -N122-23/32(69)3 (76)DEFGHJ3 (1.4)2-1/2 (64)15/32 (12)1/5 (5)3-9/64 (80)2-53/64(72)4-1/32(102)2-23/32(69)4 (1.8)4 (1.8)1-31/32(50)4-17/32(115)1497A-A2-M18- -N100C3 (76)1497A-A2-M7- -N75BApprox.ShippingWt.lb (kg)4 (1.8)2-27/64(61)4 (1.8)2-1/2 (64)3-9/64 (80)2-5/8 (67)15/32 (12)4-1/32(102)5 (2.3)1/5 (5)3-3/8 (86)3-3/64 (77)3 (76)2-13/16(71)3-15/32(88)4-23/64(110)5 (2.3)1497A-A2-M19- -N4-1/32(102)3 (76)2-23/32(69)2-27/64(61)2-1/2 (64)3-9/64 (80)4-1/32(102)5 (2.3)1497A-A3-M6- -N4 (102)3-3/8 (86)3-3/64 (77)2-27/64(61)2-13/16(71)3-15/32(88)4-23/64(110)5 (2.3)1497A-A3-M7- -N4-1/16(103)3-3/4 (95)3-23/64(85)3-49/64(96)4-21/32(118)1497A-A3-M8- -N1497A-A3-M18- -N4-17/32(115)1497A-A3-M19- -N4 (102)2-13/16(71)3-5/16 (80)15/32 (12)1/5 (5)3 (76)3-3/8 (86)3-3/64 (77)2-27/64(61)6 (2.7)6 (2.7)2-13/16(71)Rockwell Automation Publication -1497-TD001A-EN-P3-15/32(88)4-23/64(110)6 (2.7)
1497 Control Circuit TransformersVACat. No.A1497A-A4-M6- -N4-1/16(103)1497A-A4-M7- -N1501497A-A4-M8- -N4-17/32(115)1497A-A4-M18- -N5-1/16(129)1497A-A4-M19- -N4-1/16(103)SpecificationsBCDEFG2-13/16(71)3-3/4 (95)3-23/64(85)3-3/16 (81)HJ3-49/64(96)3-5/16 (80)15/32 (12)1/5 (5)3-25/32(96)6 (2.7)4-21/32(118)7 (3.2)7 (3.2)3-49/64(96)2-13/16(71)Approx.ShippingWt.lb (kg)7 (3.2)1497A-A5-M6- -N1497A-A5-M7- -N2001497A-A5-M8- -N2-5/8 (67)4-3/8 (111)4-1/2 (114)3-31/32(101)10 (4.5)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)1497A-A5-M18- -N2-63/64(76)1497A-A5-M19- -N2-5/8 (67)10 (4.5)2-53/64(72)10 (4.5)10 (4.5)1497A-A6-M6- -N1497A-A6-M7- -N4-3/8 (111)1497A-A6-M8- -N4-1/2 (114)2501497A-A6-M18- -N1497A-A6-M19- -N4-3/4 (120)3-31/32(101)3-15/32(88)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)2-53/64(72)4-3/8 (111)10 (4.5)10 (4.5)1497A-A7-M6- -N1497A-A7-M7- -N4-3/4 (120)4-1/2 (114)3-31/32(101)3-3/16 (81)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)12 (5.4)6-7/64(155)5-1/4 (133)4-5/8 (118)3-7/8 (98)4-3/8 (111)1-1/16 (27)5/16 (8)4-2/5 (112)5-15/16(151)12 (5.4)4-1/2 (114)3-31/32(101)12 (5.4)4-1/2 (114)3-31/32(101)3-3/4 (95)1497A-A7-M8- -N3001497A-A7-M18- -N1497A-A7-M19- -N4-3/4 (120)1497A-A8-M6- -N4-3/4 (120)1497A-A8-M7- -N4-63/64(128)1497A-A8-M8- -N3503-3/16 (81)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)3-3/16 (81)12 (5.4)1497A-A8-M18- -N6-7/64(155)5-1/4 (133)4-5/8 (118)3-7/8 (98)4-3/8 (111)1-1/16 (27)5/16 (8)4-2/5 (112)5-15/16(151)14 (6.4)1497A-A8-M19- -N4-3/4 (120)4-1/2 (114)3-31/32(101)3-3/16 (81)3-3/4 (95)15/32 (12)1/5 (5)4-2/5 (112)5-9/32(134)14 (6.4)6-7/64(155)5-1/4 (133)4-5/8 (118)3-7/8 (98)4-3/8 (111)1-1/16 (27)5/16 (8)4-2/5 (112)5-15/16(151)1497A-A9-M6- -N5001497A-A9-M7- -N1497A-A9-M8- -N19 (8.6)1497A-A9-M19- -N1497A-A10-M6- -N7501497A-A10-M7- -N1497A-A10-M8- -N1497A-A10-M19- -N1497A-A11-M7- -N1497A-A11-M8- -N8-7/64(206)28 (12.7)5-1/4 (133)4-5/8 (118)5-7/8 (149)4-3/8 (111)1-1/16 (27)5/16 (8)4-2/5 (112)5-15/16(151)7-39/64(193)40 (18.1)7-7/64(181)6-3/4 (171)5-55/64(149)4-31/32(126)6-1/8 (155)9/10 (23)5/16 (8)4-2/5 (112)7-3/16(183)1497A-A13-M6- -N1497A-A13-M7- -N1497A-A13-M8- -N30001497A-A14-M6- -N41 (18.6)53 (24)8-7/64(206)6-3/4 (171)5-55/64(149)6-1/8 (155)6-1/8 (155)7/8 (22)5/16 (8)4-2/5 (112)7-3/16(183)1497A-A12-M8- -N200042 (19.1)41 (18.6)1497A-A12-M6- -N1497A-A12-M7- -N32 (14.5)31 (14.1)31 (14.1)1497A-A11-M19- -N150018 (8.2)18 (8.2)7-39/64(193)1497A-A11-M6- -N100014 (6.4)55 (24.9)54 (24.5)8-7/64(206)53 (24)6-3/4 (171)5-55/64(149)9 (229)7-41/64(194)9 (229)8 (203)6-1/8 (155)6-1/8 (155)7/8 (22)5/16 (8)4-2/5 (112)7-3/16(183)4-2/5 (112)8-61/64(227)61 (27.7)58 (26.3)5-1/4 (133)7-1/2 (191)9/10 (23)Rockwell Automation Publication 1497-TD001A-EN-P7/16 (11)72 (32.7)13
1497 Control Circuit TransformersSpecificationsBulletin 1497B — Control Power TransformersBulletin 1497B Control Power Transformers are designed to reducesupply voltages to control circuits. The complete line of transformers isavailable with optional factory-installed or panel-mount primary andsecondary fuse block. 50 3000VA (60 Hz) RoHS compliant Single phase Epoxy encapsulatedStandards ComplianceUL 5085-1, UL 5085-2CSA C22.2 No. 66.1CertificationscULus Listed (File No. E52057;Guide No. XPTQ, XPTQ7)Catalog Number ExplanationBulletin 1497B Control Power Transformers1497B – A3 – M11 – 0 – NabcdabcVA RatingPrimary and Secondary VoltageFuse Block Options CodeDescription [VA]CodePrimarySecondaryCodeBlock OptionsA150M11600/575/550V120X240V (60 Hz)00 Primary, 0 SecondaryA275M12120X240V120X240V (60 Hz)10 Primary, 1 SecondaryA3100M13120X240V24V (60 Hz)22 Primary, 0 SecondaryA4150M14240X480V120X240V (60 Hz)32 Primary, 1 SecondaryA5200M15380/400/416V115X230V (60 Hz)A6250M16240X480V24V (60 208/240VdFactory Installed Options24V (60 Hz)CodeDescriptionNNo TapsNote: For complete list of valid transformer configurations, see Product Selection. Transformers rated 350VA and below use secondary fuse clips. Transformers rated 500VA and above use secondary fuse blocks.14Rockwell Automation Publication -1497-TD001A-EN-P
1497 Control Circuit TransformersSpecificationsSelecting a Control Power TransformerFor proper transformer selection, three characteristics of the loadcircuit must be determined in addition to the minimum voltagerequired to operate the circuit. These are total steady-state (sealed)VA, total inrush VA, and inrush load power factor. Total steady-state (sealed) VA is the volt-amperes that thetransformer must deliver to the load circuit for an extended periodof time — the amount of current required to hold the contact in thecircuit. Total inrush VA is the volt amperes that the transformer mustdeliver upon initial energization of the control circuit. Energizationof electromagnetic devices takes 30 50 milliseconds. During thisinrush period, the electromagnetic control devices draw manytimes normal current — 3 10 times normal is typical. Inrush load power factor is difficult to determine without detailedvector analysis of all the load components. Such an analysis isgenerally not feasible. Therefore, a safe assumption is 40% powerfactor.Selection Process1. Determine the total inrush VA of the control circuits from the tablebelow, Typical Magnetic Motor Starter and Contactor Data 60 Hz,120 Volt, 3-Pole. Do not neglect the current requirements ofindicating lights and other devices that do not have an inrush VAbut are re-energized at the same time as the other components inthe circuit. Their total VA should be added to the total inrush VA.2. Refer to the table below, Regulation Data — Inrush VA. If thesupply circuit voltage (Step 1) is reasonably stable and fluctuatesnot more than 5%, refer to the 90% secondary voltage column.If it fluctuates as much as 10%, refer to the 95% secondaryvoltage column. Go down the column selected until at the inrushVA closest to, but not less than, the inrush VA of the controlcircuit.3. Read to the far left side of the chart. The transformer’scontinuous nominal VA rating is now selected. The secondaryvoltage that will be delivered under inrush conditions will be either85%, 90%, or 95% of the rated secondary voltage, depending onthe column selected from the table below, Regulation Data —Inrush VA. The total sealed VA of the control circuit must notexceed the nominal VA rating of the transformer selected from thetable below, Typical Magnetic Motor Starter and Contactor Data60 Hz, 120 Volt, 3-Pole.4. Refer to the specification tables on the following pages to selecta transformer according to the required continuous nominal VA,and primary and secondary voltage combinations.Regulation Data — Inrush VAPower FactorAdjustmentsInrush VA at 40% Power FactorNominalVA Rating85%90%95%PowerFactorMultiply �3000256802018013797——Rockwell Automation Publication 1497-TD001A-EN-P15
1497 Control Circuit TransformersSpecificationsFuse Sizing ChartsImportant: Select the fuse to protect the control circuit conductors in accordance with the National Electrical Code.Primary Fuse Sizing Chart (When only primary protection is used)Maximum Amp rating for current limiting fuses based on transformer primary voltage and the National Electrical .750.751.125 21288776.2564443
Technical Data Control Circuit Transformers Bulletin Numbers 1497, 1497A, 1497B, 1497D Additional Resources These documents contain additional informat
applications including generator step-up (GSU) transformers, substation step-down transformers, auto transformers, HVDC converter transformers, rectifier transformers, arc furnace transformers, railway traction transformers, shunt reactors, phase shifting transformers and r
These devices make up the majority of the loads supplied by the control circuit transformer. Control circuit transformers ar e also referred to as Industrial Control Transformers, Machine Tool Transformers, and Control Power Transformers. Inrush Volt-Ampere and Sealed Volt-Ampere Considerations . Mu
7.8 Distribution transformers 707 7.9 Scott and Le Blanc connected transformers 729 7.10 Rectifier transformers 736 7.11 AC arc furnace transformers 739 7.12 Traction transformers 745 7.13 Generator neutral earthing transformers 750 7.14 Transformers for electrostatic precipitators 756 7.15 Series reactors 758 8 Transformer enquiries and .
2.5 MVA and a voltage up to 36 kV are referred to as distribution transformers; all transformers of higher ratings are classified as power transformers. 0.05-2.5 2.5-3000 .10-20 36 36-1500 36 Rated power Max. operating voltage [MVA] [kV] Oil distribution transformers GEAFOL-cast-resin transformers Power transformers 5/13- 5 .
Instrument . Transformers. 731. 736 737. 735. g. Multilin. 729 Digital Energy. Instrument Transformers. 738 739. 739 Instrument Transformers. Control Power Transformers 5kV to 38kV - Indoor type. Current Transducers 600 Volt Class IEC - Rated Instrument Transformers
A control transformer is an isolation transformer designed to provide a high degree of secondary voltage stability (regulation during a brief period of overload condition (also referred to as "inrush current" ). Control transformers are also known as Machine Tool Transformers, Industrial Control Transformers or Control Power Transformers.
- IEC 61558 – Dry Power Transformers 1.3. Construction This dry type transformer is normally produced according to standards mentioned above. Upon request transformers can be manufactured according to other standards (e.g. standards on ship transformers, isolation transformers for medical use and protection transformers.
cation and for the testing of the transformers. – IEC 61378-1 (ed. 2.0): 2011, converter transformers, Part 1, Transformers for industrial applications – IEC 60076 series for power transformers and IEC 60076-11 for dry-type transformers – IEEE Std, C57.18.10-1998, IEEE Standard Practices and Requirements for Semiconductor Power Rectifier
