MAM-B series electric motor intelligent protector
MAM-BseriesIntelligent protector for electric motorsA motor protection and control device developed based on microprocessor technology with advanced fieldbus interfaces. The protection and control functions of the motor are executed by the microprocessor, which completes the statistics of the number of motor operations, self diagnosis, and communication with the upper computer.MAM-BThe comprehensive protection provided for the motor avoids production accidents caused by possible faults such as motor overload, overheating, locked rotor, undervoltage, light load, phase failure, three-phase imbalance, grounding, etc., and maximizes the effectiveness and safety of equipment operation,MAM-BAdopting RS485 communication interface design ensures fast and reliable communication with the upper computer, PLC, and DCS, while also being able to quickly respond to real-time queries and perform corresponding operations from the upper host. Easy to use, safe and reliable.
Protection function
Overcurrent protection, phase failure protection, three-phase unbalance protection, locked rotor protection, undervoltage protection, leakage protection, short circuit protection.

Display monitoring
Operating status, three-phase current, line voltage, leakage current, and fault information display

Fieldbus function
MAM—AEquipped with RS-485 remote communication interface, supporting MODBUS-RTU and bus protocol, it is convenient to form a network system with PLC, DCS, and backend machines. Real time control, monitoring of operational status parameters, and querying of historical data of on-site equipment are carried out through the backend machine.MAM—AMonitoring and recording the operation status and fault causes of motors greatly facilitates the development of motor maintenance plans and reduces equipment maintenance costs.

precautions
1. When installing and wiring the protector, each terminal should be connected correctly for its intended purpose.
a、 01 02 terminal; The power supply (AC220V, 380V) input should be connected to the front end of the air switch of the primary main circuit or
Dedicated power supply.
b、 03 04 Terminal: Protection outlet J1 (normally closed).
c、 05 06 Terminal: Protection outlet J2 (normally open) or self starting (user can choose one).
d、 07 08 Terminal: Leakage protection sensor input (K1, K2).
e、 09 10 terminal: RS485 communication protocol or 4-20mA current output.
2. The working power supply of the protector should be connected to the control circuit, and the nominal voltage should match the actual voltage.
3. All protection settings should be correct and error free, and unused options should be abandoned.
4. Select the corresponding current specification protector based on the rated current value of the motor.
5. When the three-phase cable can directly pass through the three-phase threading hole of the protector, the card type current sensor can be omitted; If not
When directly passing through the three-phase wiring holes of the protector, the card type current sensor can be split in half, and then the cable clip can be inserted into the current transmission
Inside the sensor, then assemble the card type current sensor into one unit and tighten the fixing screws.
6. When using a current transformer with a protective device, if an ammeter is required to display on site or in the control room, it is recommended to install another one
A current transformer with variable ratio, otherwise it will affect the display of the phase current with an ammeter.