Based on microprocessor technology, it integrates various technologies such as protection, control, measurement, and communication; it adopts modular design, and the product volume
Small size, compact structure, convenient installation, improved system reliability; real-time monitor ing of motor return based on the optional voltage function.
Various parameters of the circuit, such as three-phase current, voltage, active power, reactive power, power factor and other electrical parameters measurement and control;
With start-up timeout, overload, locked rotor, phase failure, unbalance,grounding, leakage, short circuit, underload, temperature, overvoltage, undervoltage, frequency rate, power factor and other protection functions;
Up to 8 programmable switch inputs, which can realize remote monitoring of the running state of the motor by the remote master station;
4-way programmable relay output, multiple start-up methods, through the communication bus, the remote master station can realize real-time remote control of the motor "start/start"stop" operation;
With international standard RS-485 or CANBUS communication interface, RS485 interface adopts common ModBUS-RTU or ProfiBUS-DP interface (optional) communication protocol, CANBUS interface adopts common.DeviceNET communication protocol (optional).
It ensures fast and reliable communication with the host computer; it has a DC4~20mA analog output interface (optional), which can directly communicate with DCS.The system is connected to realize the monitoring of the field equipment;
It completely replaces conventional components such as various physical pointer meters, signal lights, thermal relays, and power transmitters in the past;
Using LCD liquid crystal display, reliability and comprehensive cost erformance.
Notice:
When the rated current of the motor is greater than 100A, it is necessary to add a protection CT with an overload capacity of 8 times. The CT transformation ratio is □/5A, and "□" indicates the current rated current of the motor and the specification.If the current rated current of the motor is 280A, the protection CT of 300A/5A specification can be selected.
Multiple additional functions can be selected at the same time. If you need to choose leakage protection, the function code is S. The data in this table is applicable to 380V motors.
System parameters:
Motor rated voltage: AC 380V or 660V, directly connected to 6NT28M.
Motor rated current: 6NT28M contains a small three-phase CT, the CT primary side input motor rated current can be AC: 0.5A, 1A, 2A, 2A~5A (5A),5A~10A(10A), 10A~25A(25A), 25A~50A(50A), 50A~100A(100A), 100A~250A(250A), 250A~800A(800A),
"Note": 1. The current model of the controller is in the brackets on the right, and the user needs to select the controller of the corresponding current model according to the rated current of the motor used.
2. When the rated current of the motor is greater than 100A, an external protection level CT should be connected, and the secondary side current of the CT should be connected to the controller; the CT transformation ratio can be set in the controller. The external standard CT is selected, and the rated current of the primary side of the CT is recommended to be 3 to 5 times the
rated current of the motor.
Controller power supply voltage: AC and DC 85~265V.
Switch input (passive node): DC or AC 110V/220V.
Relay output: AC 250V/5A; DC 30V/5A.
Functional configuration:
The standard configuration of 6NT28M has protection functions such as start-up timeout, overload, phase failure, grounding/ leakage protection, overcurrent lock-rotor, current unbalance protection, short circuit, etc.
Protection functions such as degree*, under-voltage*, over-voltage*, frequency*, under-power factor*, phase sequence*, and anti-shake power* are optional. For detailed function configuration, please refer to Table 4-1 Function Configuration Table.
