B+Z250/F1260 SD系列智能直行程电动执行机构天津伯纳德

explain:
The straight stroke electric actuator is used to drive single seat, double seat control valve, sleeve valve, high temperature and high pressure, feed water, desuperheating water and other control valves requiring linear displacement.

1、 Product overview
（1） It is an intelligent control system.
SD series intelligent motor actuator, on the premise of fully taking the advanced technology of similar products at home and abroad, according to the characteristics of China's industrial control system, uses modern single-chip technology to complete its functions by the reliable pic-16c711 single-chip microcomputer as the core, and all kinds of functions are completed by & quot; software & quot; program.
（2） It is a control system with complete functions.
1. Off signal protection function: when the input signal is less than 2mA, it is regarded as off signal. At this time, the output shaft acts according to the preset state of the user. There are three preset modes: A, in situ, B, full open, C, full close.
2. Over current protection function: when the actuator is over-current, the control circuit of the machine will automatically close and the actuator will remain in place to protect the actuator and valve.
3. Dynamic electric braking function --- when the motor runs to the given value = feedback value, the output shaft will vibrate due to inertia. At this time, a dynamic electric braking command (i.e. an instantaneous reverse current) is sent out by the & quot; software & quot; program to stop the sweeping mechanism immediately without idling oscillation, which greatly improves the reliability and stability of the automatic regulation system.
4. Upper limit and lower limit function --- according to the needs of the site, the angular stroke is within 90 degrees, and it is within the rated stroke range. The upper and lower limit can be adjusted at will, and the adjustable range is about 40%. When leaving the factory, the lower limit is set to 4mA and the upper limit is set to 20mA
（3） It is a control system with high reliability and stability.
The pic series single chip microcomputer has powerful function and high reliability. It integrates central controller ram, ROM and I / O port. Due to the elimination of external leads, the possibility of interference is almost zero. Compared with the similar products of conventional circuits, Ken has the advantages of compact structure, less components, small volume, convenient adjustment, low failure rate and high stability. In addition, because the MCU is a single byte instruction, the confusion between operation code and operation number is eliminated, and the stability is further improved. Otherwise, the program is burned in ROM, and the "watchdog" is increased in the software design; (the watchdog circuit works independently in the MCU, and is not affected by the clock and circuit), which fundamentally eliminates the occurrence of the "crash" of the MCU. Therefore, this system is a very reliable system. In summary, SD series intelligent electric actuator is an advanced model with the level of 90's, which is an upgrade of traditional products.

2、 Main technical performance:

The following technical performance mainly refers to the proportional regulation type, and the following items 1, 2, 3, 4, 5, 6, 11, 12, 13 and 14 of remote control type and switch type are not involved.

1. Input signal: 4mA-20mA DC or 1v-5v DC;
2. Input channel resistance; 250 & omega;;
3. Number of input channels: 1 (3 in discrete form);
4. Basic error:±1,±2.5%;
5. Return difference: 1%, 1.5%;
6. Dead zone: 0.5-3% (can be set according to system requirements);
7. Damping characteristics: no swing
8. Power supply voltage: single phase 220 V (+ 10%, - 15%) 50 Hz±1%
Three phase 380V±10% 50Hz±1%
9. Working environment: temperature: integral - 10 - + 55 ℃; vertical - 25 - + 70 ℃; humidity: 1≤85%, the surrounding air does not contain corrosive substances;
10. The protection grade of the shell is in accordance with gb4208 IP65 (i.e. rainproof and dustproof);
11. Off signal protection function: there are three preset modes: A, home position, B, full open, C, full close;
12. Over current protection function: for different models, the protection current value can be adjusted; (the mechanical part has over torque protection switch)
13. Dynamic electric braking function;
14. Upper and lower limit function: within the rated travel range, the upper and lower limit adjustable range is about 40%; (the mechanical part has travel control switch and mechanical limit)
15. Working system; reversible intermittent working system, connection duration rate 50%, connection times 1200 per hour.