RELIANCE 7756118X three-phase industrial isolation transformer
7756118X is a three-phase industrial isolation transformer from RELIANCE Electric, belonging to the 77561 series power transformation component for DC drive and AutoMax automation system power distribution. It adopts enclosed iron shell box-type structure, internal copper winding with insulating impregnation treatment, anti-damp and anti-vibration for harsh industrial cabinet environment, mainly used to convert industrial grid voltage into dedicated operating voltage for drive control unit, widely used as spare replacement for old metallurgy, chemical industry drive equipment renovation.
Description
1. Product Introduction
7756118X is a three-phase industrial isolation transformer from RELIANCE Electric, belonging to the 77561 series power transformation component for DC drive and AutoMax automation system power distribution. It adopts enclosed iron shell box-type structure, internal copper winding with insulating impregnation treatment, anti-damp and anti-vibration for harsh industrial cabinet environment, mainly used to convert industrial grid voltage into dedicated operating voltage for drive control unit, widely used as spare replacement for old metallurgy, chemical industry drive equipment renovation.
2. Model Definition Explanation
77561 stands for RELIANCE standard three-phase dry-type transformer product series; the middle two digits define voltage transformation ratio specification; the suffix 18 is factory customized winding parameter code; X marks improved insulation reinforced version with upgraded temperature-resistant enameled wire compared to basic standard model.
3. Technical Specifications
Rated three-phase input industrial AC voltage, customized primary and secondary winding matching drive power loop; ambient working temperature -10℃ ~ 55℃, maximum allowable temperature rise 100℃ under full load operation, insulation class conforms to industrial standard, non-condensing working humidity ≤90%RH. Built-in overheat inherent impedance protection, short-circuit withstand design, shell is all-metal sealed construction with mounting base holes for cabinet fixed installation.
4. Interface and Communication Configuration
External screw wiring terminals set on the side of transformer shell for primary input three-phase power wiring and secondary output wiring; no bus communication circuit, no backplane golden finger interface, only passive voltage conversion without digital signal transmission function, all circuit connection completed via external power cable.
5. Core Functions
Realize three-phase mains voltage step-down isolation for downstream DC controller and auxiliary control loop, isolate power grid surge interference to improve drive system anti-interference ability; provide stable rated working voltage for control board, cooling fan and auxiliary relay inside drive cabinet; restrict short-circuit current via inherent winding impedance to avoid subsequent component breakdown when rear-end circuit abnormal short occurs.
6. Application Scenarios
Matching RELIANCE DC series speed regulating drives and AutoMax control cabinet power supply system, main applied in metallurgical rolling production line, textile multi-motor linkage production line, printing machinery, chemical industry large pump and fan variable frequency drive control system, used for on-site transformer failure replacement and equipment maintenance spare parts.
7. Operation and Maintenance Instructions
Cut off all upper-level three-phase power supply before wiring or disassembly to prevent electric shock hazard; every half year open the shell to clean internal winding accumulated dust; regularly check terminal fastening status to avoid loose wiring causing overheating burnout; stop continuous overload operation exceeding rated KVA parameter, replace the unit when abnormal heating or insulation aging occurs.
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