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Y-701 Automatic Transfer Switch Controller - China Suppliers and Factory with Customizable Voltage Options

Rated Operating Voltage: AC 220V, 380V (customizable voltage levels available)

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Operating Frequency: 50Hz/60Hz

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Voltage Measurement Accuracy: ± 1%

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Frequency Measurement Accuracy: ± 0.05 Hz

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Adjustable Switching Time: 0.05-5 seconds

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Communication Interface: RS485, with optional Ethernet connectivity

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Communication Protocol: Modbus RTU, TCP/IP (optional)

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Working Temperature: -20 °C to +60 °C

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Humidity Tolerance: ≤90% Rh (non-condensing)

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Certifications: CE, CB, CCC

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Standard Compliance: IEC 60947-6-1

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As a leading China supplier and factory, we take pride in delivering top-quality products designed to meet your operational needs. For more information, please contact us at sale@lvma-ele.com.

    LMS1-LA Series Manual
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    Product Details

    LMS1-LA as our ingenuity research and development of a new generation of dual power automatic transfer switch, in the performance and technology to achieve a major breakthrough. The product provides 63A, 125A, 250A, 400A, 630A and other rated current specifications, whether it is the continuous operation of massive servers in data centers, or the uninterrupted power supply of life support equipment in hospital ICU wards, the stable operation of elevator and fire fighting system in high-rise buildings can fully meet the power demand in different scenarios. ​

    Its switching speed can be called industry-leading, switching time only 10ms-50ms, with millisecond response speed to complete power conversion. In the data center, the LMS1-LA automatic transfer switch can switch to the standby power supply in a very short period of time in the face of sudden power failure, avoiding data loss and system collapse caused by momentary power failure; in the hospital environment, the LMS1-LA automatic transfer switch can switch to the standby power supply in a very short period of time, millisecond-level power switching can guarantee the stable operation of precision instruments and first-aid equipment in operating rooms, and escort the safety of patients. When applied to high-rise buildings, fast power changeover ensures smooth parking of elevators, normal operation of fire fighting systems and improved building Factor of safety. ​
    The transfer switch is composed of a high performance excitation contactor and an intelligent controller. When working, the electromagnetic coil produces a strong and stable attraction to drive the switching action to ensure the instant completion of power switching. This feature not only effectively guarantees the rapid switching of the power supply when the equipment is powered off, but also realizes the seamless connection of the power supply, which provides a reliable and solid power guarantee for the equipment with strict requirements for power continuity. ​

    The Y-701/Y-702 series is an advanced dual power system controller with excellent compatibility for our full range of products. The series integrates microprocessor measurement unit and programmable output unit, in which Y-702 is equipped with communication unit to further expand the functional boundary.

    For display, Y-701 uses traditional display, Y-702 is upgraded to LED display to meet the diverse needs of different users for display interface.

    This series of controllers have a very practical adjustable switching delay function, and have a variety of adjustable working modes, which can be flexibly adapted to various complex power consumption scenarios. It is worth mentioning that the series is equipped with intelligent power module, greatly reducing the risk of human operation, for the stable operation of the system to build a strong security line.

    The microprocessor-based Y-701/Y-702 series controllers have extremely high circuit sensitivity and can accurately capture subtle changes in the circuit such as over-voltage, under-voltage, and phase loss, and quickly output passive switch vector signal to ensure the efficient and stable operation of the dual power supply system, and provide a solid guarantee for the reliable power supply of all kinds of electrical equipment.

    Model Description
    Y-701 Automatic transfer switch controller detail (1)
    ATTENTION
    • Controller is equipped with the cable while out of factory; cable should be correctly connected — refer to the mark A / B / C / N.
    • FU1 / FU2 — Normal power and standby power fuse tube; the value will change depending on ATS model:
      • While equipped with GA type ATS: FU1/FU2 = 2A
      • While equipped with C, N, S type ATS: FU1/FU2 = 10A
      • While equipped with N, Q type ATS: FU1/FU2 = 16A
    Main Technical Parameters
    Products Model Number Y-701 Y-702
    Installation Method Fission type
    Display Mode Indicator light LED
    Rated Duty Uninterrupted duty
    Self-input and Self Restore ■ ■
    Normal Port and Standby Port Share to Each Other ■ ■
    Generator Auto-start Function ■ ■
    Normal Power Detect ■ ■
    Standby Power Detect Four-phase lacking phase detection, three-phase over-voltage/under-voltage detection
    Passive Fire Protection Input Four-phase lacking phase detection, three-phase over-voltage/under-voltage detection
    (DC9–36V) Active Fire Protection Input ■ ■
    Active Fire Control Input ■ ■
    Voltage Real-time Display ■ ■
    Normal Power and Standby Power Indication □ ■
    Normal Power and Standby Power ■ ■
    Over-voltage / Under-voltage Adjustable ■ ■ (F/F1)
    Generator Rev. Stop Time Adjustable ■ ■
    Programmable Output □ ■
    RS485 Communicating Function □ ■
    Structure and Mounting Dimensions
    Y-701/702 — Function of Each Terminal
    R- R+ GND R1 485B (−) 485A (+) EGND
    • R− & R+: DC9V–36V active fire control input enabled
    • GND & R1: Short circuit — passive fire control unit enabled
    • 485A & 485B: RS485 communication terminal  |  EGND: Frame Ground

    Communication Protocol Parameters:

    Local Host: 1 (1–32, can be modified)  |  Baud Rate: 9600 bps

    Data Bit: 8  |  Parity Bit: None  |  Stop Bit: 1

    M3 M4 L2 A2 A2 B2 C2 N2 T2 T1 F2 F1 F N1 C1 B1 A1 A1 L1 M2 M1
    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
    • M3, M4: Standby power passive closing auxiliary output; outputting time depends on ATS model — approx. 3 seconds within magnet exciting coil; Electric type ATS can be more than 10 seconds.
    • L2: Standby power active closing feedback input — only limited to phase A/B/C.
    • A2: Standby power phase A output, feedback to the closing standby power.
    • A2, B2, C2, N2: Standby power three-phase & four-wire input.
    • T1, T2: All-off signal output — can be active or passive depending on ATS model. When equipped with PC class three-section ATS, it is 220V AC active output; it is passive when equipped with seclusion type ATS.
    • F2, F1, F: In Y-701 controller, F1 and F are starting generator signal output. In Y-702 controller, F1 and F are programmable output.
    • A1, B1, C1, N1: Normal power three-phase & four-wire input.
    • A1: A phase normal output, feedback to closing normal power.
    • L1: Normal power active closing feedback input — only limited to phase A/B/C.
    • M1, M2: Normal power passive closing auxiliary output; outputting time refers to M3 & M4.
    Y-701 Automatic transfer switch controller detail (2)
    Frequently Asked Questions (FAQ)
    QWhat is the main difference between the Y-701 and Y-702 controllers?
    The Y-701 uses a traditional indicator light display, while the Y-702 is upgraded to an LED display. Additionally, the Y-702 includes an RS485 communication unit and programmable output function, which are not available on the Y-701.
    QWhat fuse value (FU1/FU2) should I use for my ATS model?
    The fuse value depends on the ATS type: use 2A for GA type ATS, 10A for C/N/S type ATS, and 16A for N/Q type ATS. Always refer to the factory cable marking (A/B/C/N) for correct connection.
    QDoes the Y-701/Y-702 support generator auto-start functionality?
    Yes, both Y-701 and Y-702 support generator auto-start function. The controller can automatically trigger the generator start signal when normal power fails, ensuring uninterrupted power supply to connected equipment.
    QWhat communication protocol does the Y-702 RS485 interface use?
    The Y-702 RS485 communication interface uses the following parameters: Local Host address 1 (adjustable from 1–32), Baud Rate 9600 bps, Data Bit 8, Parity Bit None, and Stop Bit 1. EGND serves as the frame ground terminal.
    QWhat types of fault detection does the Y-701/Y-702 series support?
    The Y-701/Y-702 series supports four-phase lacking phase detection as well as three-phase over-voltage and under-voltage detection for both normal and standby power inputs. This ensures fast and accurate response to subtle circuit abnormalities.
    QWhat is the function of terminals T1 and T2 on the Y-701/Y-702 controller?
    Terminals T1 and T2 provide the all-off signal output. The output type — active or passive — depends on the ATS model. When used with a PC class three-section ATS, it outputs 220V AC active signal. When used with a seclusion type ATS, the output is passive.

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