Overview
DJB-YC is the first cost-effective motor protection and control device based on microprocessor technology in China, possessing an advanced field bus interface. The microprocessors are used to perform motor protection and control, and support feeder protection to complete motor operation, self-diagnosis and communication with the upper computer. DJB-YC provides protection for measurement, to avoid the accidents because of motor overload, locked-rotor, overvoltage, undervoltage, light load, three-phase imbalance, phase, grounding fault, to ensure the effectiveness and safety of the equipment operation. DJB-YC USES RS485 communication interface design, guarantee quick and reliable communication protocol with superordination machine, PLC, DCS, at the same time it can quickly respond to upper host real-time query requirements and perform the corresponding operation. Easy to use, safe and reliable.
Protection function
Overcurrent, open-phase protection, block protection, three-phase imbalance protection, undervoltage protection, overvoltage protection, leakage protection, ground protection, underflow 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 function
Operation status, three-phase current, line voltage, leakage current, fault information display
Fieldbus function
DJB-YC has the RS-485 remote communication interface, supports multi-party protocol, bus protocol, convenient network system of PLC, DCS and background unit. Through the background machine to achieve real-time control of the field equipment, operation condition parameter monitoring and historical data query. DJB-YC has a great convenience for the motor operation state and the failure reason monitoring record, which makes the maintenance plan of the motor more convenient and reduces the maintenance cost of the equipment.
Technical parameters
- Overcurrent protection: protection of current can be set
- Open phase protection (three-phase imbalance)：When the value of any phase current imbalance reaches the set value, the monitor moves in 4s
- Locked-rotor protection：When the current is more than 5 times the set value, the monitor moves in 2s
- Undervoltage protection：the working voltage is less than the under-voltage set value, and the monitor is less than 15s
- 5、Overvoltage protection：the working voltage is more than the under-voltage set value, and the monitor is less than 15s
- Leakage (ground) protection: the monitor is in 3s when the leakage current exceeds the set value
- Short circuit protection: when any phase current reaches the 8Ie current, the monitor moves in 2s
8、Test range： 1. A、B、C Three phase current：0-999A
2.Voltage：AC175-450V
9、 Supply voltage：220V、380V±15%，50Hz±2%%
10、Power consumption：≤3VA
11、Output relay contact capacity：250VAC/7A
12、Current display error：1.5%
Main features
1、 Have the function of time-lapse delay protection；
2、Have the function of starting delay, avoiding starting the large current, and it is separated from the current action time
3、 Have the function of failure memory, alarm and operation value；
4、With digital display function, it can show the protection value of A, B and C three-phase working voltage, current, leakage current and accurate setting
5、 Have 4 ~ 20mA analog output interface；
6、Have RS485 remote communication interface. Remote data setting, control, query, etc.
