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0102030405
Y-702 Automatic Transfer Switch Controller - Reliable China Suppliers & Factory - AC220V, RS485, Modbus RTU
LMS1-LA Series Manual
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 Dual Power Automatic Transfer Switch Controller is a dual power supply system for the design of intelligent control equipment, designed to ensure that in the complex and changeable power environment, load can be sustained, stable and reliable power supply. Through the comprehensive monitoring of the two power supplies, it can accurately judge the status of the power supply, and quickly switch the power supply according to the preset logic, which effectively solves the problem of power interruption caused by power failure, widely used in hospitals, data centers, financial institutions, industrial production and other areas of high demand for power supply continuity.
Functional Characteristics
Precise Power Supply Monitoring
Voltage Monitoring: Real-time, accurate measurement of two power supply voltage values; over-voltage and under-voltage thresholds can be set. For example, for 220V mains, it can accurately identify voltages higher than 242V (overvoltage) or lower than 198V (undervoltage).
Frequency Monitoring: Strictly tracks the frequency of the power supply to ensure stability within 50 Hz ± 0.5 Hz, ensuring normal operation of frequency-sensitive equipment.
Phase Monitoring: In three-phase power supply systems, accurately monitors the 120° phase difference between phases, and timely detects anomalies such as excessive phase deviation or wrong phase order.
Intelligent Switching Control
Automatic Switching: When main power supply faults (over-voltage, under-voltage, phase loss, abnormal frequency) are detected, the controller automatically switches the load to the standby power supply in a very short time (usually tens of milliseconds to seconds) to ensure uninterrupted power supply.
Manual Switching: Equipped with a manual switching function; operators can switch the power supply flexibly via the controller panel button or remote command.
Flexible Switching Logic: Customizable priority for main and standby power supplies. By default, mains serve as the main supply and generators as backup. A switching delay function (adjustable 0.5–5 seconds) avoids false switching caused by instantaneous power fluctuations.
Multiple Alarm Prompts
When the power supply is abnormal or the system fails, the controller immediately sends out sound and light alarm signals. Alarm information is displayed intuitively, including specific fault types such as over-voltage, under-voltage, loss of phase, and abnormal frequency, enabling quick fault location and resolution.
Convenient Communication Function
Some models are equipped with RS485, Ethernet, and other communication interfaces for easy connection with upper computer monitoring systems, enabling remote monitoring, remote operation, and remote data transmission. Staff can monitor power supply status and issue control instructions remotely from a monitoring center, greatly improving management efficiency.
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 | □ | ■ |
Product Features
Y-701 / Y-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
Local Host: 1 (1–32, can be modified) | Baud Rate: 9600 bps
Data Bit: 8 | Parity Bit: None | Stop Bit: 1
- M3, M4: Standby power passive closing auxiliary output; output 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, limited to phase A/B/C only.
- 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; passive when equipped with seclusion type ATS.
- F2, F1, F: In Y-701 controller, F1 and F are starting generator signal outputs; in Y-702 controller, F1 and F are programmable outputs.
- A1, B1, C1, N1: Normal power three-phase & four-wire input.
- A1: Phase A normal output, feedback to closing normal power.
- L1: Normal power active closing feedback input, limited to phase A/B/C only.
- M1, M2: Normal power passive closing auxiliary output; output time refers to M3 & M4.
Frequently Asked Questions (FAQ)
QWhat is the Dual Power Automatic Transfer Switch Controller used for?
The Dual Power Automatic Transfer Switch (ATS) Controller is an intelligent control device designed to ensure continuous, stable, and reliable power supply to loads. It monitors two power sources simultaneously, automatically switching the load to a standby power supply when the main supply experiences faults such as overvoltage, undervoltage, phase loss, or frequency anomaly. It is widely used in hospitals, data centers, financial institutions, and industrial facilities.
QWhat is the difference between the Y-701 and Y-702 models?
The Y-701 uses an indicator light display, while the Y-702 features an LED display for more detailed real-time data visualization. The Y-702 also includes additional capabilities such as programmable output, RS485 communication, and enhanced normal/standby power indication — making it more suitable for applications requiring remote monitoring and advanced control.
QHow fast does the controller switch between power sources?
The controller performs automatic switching within a very short timeframe — typically from tens of milliseconds to a few seconds — once a fault condition is detected on the main power supply. The switching delay is also adjustable within a range of 0.5 to 5 seconds to prevent false switching caused by momentary power fluctuations.
QCan the voltage thresholds be adjusted on the controller?
Yes. Both the Y-701 and Y-702 controllers support adjustable over-voltage and under-voltage thresholds. For example, on a standard 220V mains supply, the controller can be configured to detect overvoltage above 242V or undervoltage below 198V, allowing precise customization for different installation environments and equipment requirements.
QDoes the controller support remote monitoring and communication?
Yes. The Y-702 model is equipped with RS485 communication interface (and optionally Ethernet), enabling seamless integration with upper-level monitoring systems. The RS485 default settings are: Local Host address 1 (adjustable from 1 to 32), Baud Rate 9600 bps, Data Bit 8, Parity None, and Stop Bit 1. This allows operators to monitor power status and issue control commands remotely from a central monitoring station.
QWhat fire protection input features does the controller support?
The controller supports both passive and active fire protection inputs. The passive fire control unit is enabled by short-circuiting the GND and R1 terminals. The active fire control input (DC 9V–36V) is enabled via the R- and R+ terminals. These features ensure that the ATS controller can be integrated into building fire safety systems for coordinated emergency power management.