The TZY-MMI-A series low-voltage motor control and protection device is suitable for 380V~660V low-voltage systems. As a new generation of intelligent protection and measurement device for the protection, monitoring, and control of low-voltage motor feeder terminals, it protects the motor from starting thermal overload, locked rotor, phase loss, reverse phase, current imbalance, zero sequence overcurrent, leakage overcurrent, low voltage, overvoltage, voltage recovery self starting, undercurrent, tE time protection, and process interlocking that occur during starting and operation. At the same time, it provides fault tripping records, which brings great convenience to accident analysis. The use of its bus communication function enables data exchange with servers or workstations, making it an ideal choice for intelligent MMI and factory DCS system intelligent terminal units.

The TZY-MMI-A series low-voltage control and protection device can be widely used in various industries such as power, metallurgy, petrochemicals, textiles, papermaking, municipal engineering, etc.

1. Adopting a 32-bit high-performance industrial grade low-power microprocessor.

2. The 'tE time protection' complies with the regulations for overload protection of increased safety explosion-proof motors (GB3836.3-2000) and is suitable for protecting increased safety explosion-proof motors in continuous operation.

3. The device automatically calculates zero sequence current without the need for an external zero sequence current transformer.

4. By using AC sampling technology, parameters such as three-phase current, leakage current, voltage, active power, reactive power, and power factor of the motor can be measured, displayed, and transmitted.

5. The analog input, switch input, and switch output modules all use complete electrical isolation technology.

6. 6 analog inputs, Ia、Ib、Ic、IL、Uab、Ucb.

7. 10 switch inputs, including 6 fixed inputs and 4 programmable inputs, can achieve rich interlocking functions and facilitate engineering design.

8. 7 switch outputs, including 3 programmable outputs and 4 fixed outputs.

9. Time display.

10. 2-channel 4-20mA intelligent analog output, which can select any one of Ia, Ib, Ic, IL, Uab, Ucb according to user needs.

11. The protection function can achieve remote switching, and the alarm signal can achieve remote reset.

12. Two standard communication buses and protocols such as RS485/MODBUS/PROFIBUS can be used for actual dual network communication.

13. You can search for 10 more recent tripping accident records.

14. Electromagnetic compatibility meets the electrical standard IEC IV level.

4.1 Analog input circuit of TZY-MMI-A series

Rated current: In~150A

Rated frequency: Fn 0Hz

Power consumption: CT circuit ≤ 1W per phase

Overload capacity: CT circuit in continuous operation

10In，10S

40In，2S

Overload capacity: PT circuit 1.2Un continuous operation

1.4Un，10S

Measurement accuracy: Current level 0.5

Voltage level 0.5

Power level 0.5

Electricity level 1

4.2 Switching input

4.3 Relay output

4.4 4-20mA output

4.5 Communication

4.6 Device Power Supply

Scope of work: AC80V-250V or DC90V-250V

Power consumption ≤ 5W during normal operation

Protection action ≤ 8W

Auxiliary power supply allows interruption time ≤ 200mS

4.7 Environmental Conditions

Allowable temperature

Working at -15 ℃ to+55 ℃

Storage -25 ℃~+70 ℃

Allow humidity

Relative humidity ≤ 95%, no condensation

Altitude ≤ 3000m

4.8 Mechanical Properties

Vibration: able to withstand the harsh level I vibration durability test specified by IEC standards

Impact: able to withstand the impact durability test with severity level I specified by IEC standards

Collision: able to withstand the harsh level I collision durability test specified by IEC standards

4.9 Electromagnetic compatibility test

4.10 Electrical Testing

Insulation resistance 100M Ω/500V

Dielectric strength test 2KV (r.m.s), 50Hz, 1min

Impulse voltage test ± 5KV; 1.2/50 µ S