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Y-701 Automatic Transfer Switch Controller - High-Quality China Suppliers & Factory - Voltage Measurement, Fast Switching Time

Rated Operating Voltage: This reliable device operates at AC 220V and 380V, with additional voltage levels available for customization to meet diverse industrial needs.

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Operating Frequency: Designed for flexibility, it supports operating frequencies of 50Hz and 60Hz.

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Voltage Measurement Accuracy: Maintain precision with a voltage measurement accuracy of ±1%, ensuring effective monitoring of electrical systems.

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Frequency Measurement Accuracy: Experience high precision with frequency measurement accuracy of ±0.05 Hz, crucial for operational efficiency.

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Adjustable Switching Time: The switching time can be finely adjusted between 0.05 to 5 seconds, providing tailored performance for various applications.

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Communication Interface: Equipped with RS485 and optional Ethernet capabilities, facilitating seamless data exchange.

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Communication Protocol: Supports Modbus RTU and TCP/IP protocols (optional), making integration with existing systems straightforward.

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Working Temperature: Operates efficiently in a broad temperature range from -20°C to +60°C, suitable for challenging environments.

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Humidity Tolerance: Designed to perform in environments with humidity levels of up to 90% Rh (non-condensing), ensuring reliability in various conditions.

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Certifications: Our product is certified by CE, CB, and CCC, meeting international safety and quality standards.

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Standard Compliance: Manufactured in accordance with IEC 60947-6-1 standards, ensuring safe and reliable operation.

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Contact Us: For inquiries and orders, reach out to our expert team at sale@lvma-ele.com. As a leading factory and supplier in China, we are committed to providing high-quality products that meet your demands.

    LMS1-LA Series Manual
    Contact us
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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 insurance tube. The value will change depending on ATS model:
      • Equipped with GA type ATS: FU1/FU2 = 2A
      • Equipped with C, N, S type ATS: FU1/FU2 = 10A
      • 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
    Q What is the 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 (terminals F1/F), which are not available on the Y-701.
    Q What fuse values (FU1/FU2) should be used with different ATS models?
    The fuse value depends on the ATS model connected: use 2A for GA type ATS, 10A for C/N/S type ATS, and 16A for N/Q type ATS. Always refer to the marking on the cable (A/B/C/N) for correct connection.
    Q Does the Y-701/Y-702 series support generator auto-start functionality?
    Yes, both Y-701 and Y-702 support generator auto-start function. In the Y-701 controller, terminals F1 and F are dedicated starting generator signal outputs. In the Y-702, these terminals serve as programmable outputs.
    Q What communication protocol does the Y-702 RS485 interface use?
    The Y-702 RS485 communication interface operates at a baud rate of 9600 bps, with 8 data bits, no parity bit, and 1 stop bit. The default local host address is 1, and it can be adjusted within the range of 1–32.
    Q What types of fault detection does the Y-701/Y-702 series support?
    The series supports four-phase lacking phase detection as well as three-phase over-voltage and under-voltage detection for both normal and standby power. The microprocessor-based design ensures high circuit sensitivity to accurately capture subtle changes in the circuit.
    Q What is the output behavior of terminals T1 and T2?
    Terminals T1 and T2 provide an "all off" signal output. The output type — active or passive — depends on the ATS model. When equipped with a PC class three-section ATS, the output is 220V AC active. When equipped with a seclusion type ATS, the output is passive.

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