This microcomputer monitoring protector is a comprehensive device for collecting, calculating, analyzing, monitoring, alarming and controlling of various running information data in the operation of the motor. The device can provide immediate and accurate protection and ensure the safety of the production by means of alarm, protection action (protection of unbuckle) and the setting of time-delay time. The device can carry out real time monitoring on the upper computer about the slim information of the motor running condition through the data communication and provide the management information by computer data processing. The limit alarm can timely remind administrative staff to deal before a significant fault may happen, which can avoid the unnecessary downtime or affect the normal production, to ensure effectiveness of operation and control to the maximum. When the motor running parameter reaches the preset warning value, the protective device only has the warning, and does not trigger the tripping; But when the limit reaches the preset value, the protection device enters the trip trigger delay. If the device returns to normal operation in the preset trip time delay, the trip will be canceled. If the delay time limit is exceeded, the protective device will emit a trip signal to drive the action of the element, and disconnect the power to stop the motor running. While the motor control device provides various protection functions, various protection information is also sent to the computer management system via the device generation and communication interface.

 Protection function：
      Overload protection, open-phase protection,three-phase unbalance protection, motor shaft lock protection, low voltage protection, over voltage protection, leakage protection, ground fault protection, light load protection, no-load protection, short circuit protection.

Control function：
      Direct starting, positive and reverse starting, star delta starting, direct bypass starting, auto-transformer reducing voltage starting, multi-party starting control。
Display and monitoring：
      Operation state, three-phase current, line voltage, leakage current, fault information, motor work accumulative time, failure times and other information.

Setting function：
    Rated current, protection current curve, start-up time, three-phase unbalance, pl ing multiple, leakage current value, overowe voltage value, communication address, protector of motor self starting time.

Remote function:

The output of standard analog output of DC4-20mA is not required for external power supply.

Communication functions:

Through RS485 serial communication and computer can form 256 protection control network. Remote data setting and display alarm, remote motor start, stop control, etc.

  Memory function:

Can store the 10 faults that occurred in the recent motor, and can press the reset key to take out the failure code of the last motor, and then once again

Main technical parameters：
1、Inverse time-delay protection：This protector has the function of the time-delay protection of overflows, as shown in FIG. 2.
2、Undercurrent protection: when the current value is less than the light load protection set value, the monitor moves in 30s.
3、Overcurrent protection: the protection current can be set arbitrarily, the current value is greater than the set value, curve movement according to the action characteristic .
4、Open phase protection: when the motor power is off phase (the three phase current imbalance is set to 60% according to the user's requirement), the monitor will move in 3s.  

   5、Motor shaft lock Protection：When running current exceeds 5 multiple，protector will perform in 2 seconds.
      6、Low voltage protection:When working voltage of protector is lower than the set voltage 15%, react in 6 seconds
      7、Over voltage protection: When working voltage of protector exceed the set voltage 15%,react in 6 seconds
      8、Leakage protection：The monitor will move within 3 seconds when the leakage current is greater than the set value, and set the range of 500mA ~ 5000mA.  

      9、 Short circuit protection: when any phase current reaches the 8Ie current, the protector moves in 2 seconds.

     10、Start delay time: 1-120 seconds adjustable.

     11、Star delta conversion time: star delta conversion time is less than the start delay time 3 seconds。
     12、Machine power consumption: less than 3VA.

     13、Output relay contact capacity: 25OVAC 7A.
     14、Current display error：≤1.5%。

     15、Reset time：≤2s

     16、Electric life is greater than 10 times. It has the function of starting time delay: avoid starting the large current and the current action time.

     17、 RS485 remote communication interface or usb interface. Remote data setting, control, query, etc. Network protection monitoring system with upper unit.