Application and Programming

Series CE-A digital electrical transducer can easily measure many kinds of useful electrical parameters of 3-phase 4-wire, 3-phase 3-wire and 1 element power lines. It can also be widely used in various industrial control and measuring systems. One sensor/transducer can replace many kinds of single parameter Transducer i.e. current, voltage, frequency, power, power factor and energy Transducer etc. It can reduce the cost of system and is easy to wiring at work site; especially its advanced isolation technology greatly improved the performance of system and help to carry the reliability and stability of the system to a new and higher level. CE-A is able to connect to any industrial digital control system with the RS-485 bus communication technology and ASCII order set. So it is convenient to program and to extend the system and let you build up your own control system easily.
The default configuration of each CE-A transducer before delivery: transducer address is set to "01"(hex), and baud rate is 9600bps.
Note:

• Transducer address is programmable. It can be set from 0 through 255(00-FFH) optionally.
  
• Five programmable baud rates can be used: 1200bps, 2400bps, 4800bps, 9600bps and 19200 bps.
• The configuration data will be stored in EEPROM after the transducer address and baud rate were revised.

2. Select the Measuring Range:
You may select Series CE-A products with their measuring range of voltage (0~500V), current (1~25A). Usually 1.2 times of the maximum value of measuring range can be measured correctly.
The transducer could not be damaged when the inputs are less than 2 times of the maximum value of measuring range of voltage and 10 times of the maximum value of measuring range of current. Pay attention to connect the polarity of power correctly with right rated voltage.

3. RS-485 Network:
Up to 64 Transducer can be connected in an RS-485 bus; the maximum communication distance can reach 1200m. The transducer can be connected directly to digital industrial control system with RS-485 interface. If the system has only RS-232C interface available, RS-232C/RS-485 converter have to be used for data handshaking.

4. Configuration:
Each CE-A sensor/transducer must be configured before it is connected to a netwoek. The baud rate of transducer must conform to that of the netwoek; and no address collision (no overlapping the address of any other device in the netwoek) could be allowed. To configure a transducer you need RS-485/RS-232C converter, computer with RS-232 interface and application software of intelligence transducer. The configuration can be completed easily by CE-A sensor/transducer application software. You should configure it by programming according to the order set of the transducer.
Data acquisition: After you connected the transducer correctly and properly. When the computer sends one of read orders, the transducer will return (respond) the measured data to the computer. The data inside the EEPROM of the CE-A sensor/transducer will be refreshed every 250ms(the values of voltage and current etc. are RMS during the 250ms). Data of energy is accumulated since powered-on and is cleared after received a clear order.
Output data is in the form of a percentage of the maximum value of its measurable range. Its format consists of 1 place of sign "+" or "-" and 5 digits of decimal system value of data and a decimal point. The data of frequency is a real value of the frequency measured. Its conversion formula is as follows:
The maximum value of measurable range of current of the transducer: Io
The maximum value of measurable range of voltage of the transducer: Uo,
Then

Voltage U = u x Uo Current I = i x Io Active power P = p x Uo x Io x 1 Active power P = p x Uo x Io x 2 Active power P = p x Uo x Io x 3 Reactive power Q = q x Uo x Io x 1 Reactive power Q = q x Uo x Io x 2 Reactive power Q = q x Uo x Io x 3 Power factor COS F=? Frequency = f

V A W (for single phase products) W(for 3-phase 3-wire two wattmeter method products) W(for 3-phase 4-wire products) Var (for single phase products) Var(for 3-phase 3-wire two wattmeter method products) Var(for 3-phase 4-wire products) Hz

Energy = energy output data x Uo x Io/(1000 x 3600) Kwh
Note: u, i, p, q are output data from the transducer in the form of a percentage of the maximum value of measurable range of the transducer.