UUD148AE02 ABB current measurement controller module

Brand ABB Color Standard Application Industrial height 325mm rated current 490mA
Protection Level IP45 Suitable for motor power 116KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part Number UUD148AE02
Applicable pipe 2 Whether imported is weighing 5.18 kg can be sold nationwide

UUD148AE02 ABB current measurement controller module

CAN bus is a kind of serial communication network which can support distributed control system effectively. On the one hand, its communication mode is flexible, can realize multi-master mode, and can also realize a variety of data transmission and receiving modes such as point-to-point and point-to-multipoint. On the other hand, it can carry out data communication at higher rates over relatively large distances, such as 20 kb/s over a distance of 3.3 km. Our system is controlled and managed by the host computer for a number of parallel single power control systems, the distance of the single power supply is about 100 m, and it must be placed in a higher position, and the system should be fast data transmission, CAN bus can well meet the requirements of the system.

1 Overall system structure

Figure 1 is a schematic diagram of the distributed power control system.

This system uses C51 single chip microcomputer, external CAN controller SJA1000, he transmits the control set value to the following multiple machines, and analyzes and calculates the data sent by the next machine to change the set value. Nodes CAN1 ~ CAN31(up to 31 sets) are the control parts of each single power supply. We use TI’s TMS320LF2407 chip as the main control, and CAN controller module is integrated on it.

The CAN0 node is the upper computer.

2LF2407 and its integrated CAN control module are introduced

LF2407 is a fixed-point DSP processor launched by TI company, which uses high-performance static CMOS technology, the power supply voltage is 3.3V, the instruction cycle CAN reach 25 ns, and it integrates a number of peripheral modules and memory including CAN controller, which is suitable for the control of motor and inverter circuit.

The CAN controller module is a 16-bit peripheral module integrated in the LF2407. The module has the following features:

(1) Support CAN2.0B protocol, support standard identifiers (11 bits) and extended identifiers (29 bits), support data frames and remote frames.

(2) Configure 6 mailboxes, 2 receiving (0,1), 2 sending (4,5), 2 configurable (3,4); The length of each mailbox data is 8 B. The receiving mailbox can be masked by identifier. When the identifier bit is masked, the bit identifier does not need to be checked when receiving the data frame.

(3) With programmable bit timer, interrupt service and CAN bus wake-up function.

(4) can automatically reply to remote requests, when sending errors or data loss, there is an automatic resend function. Each mailbox register contains 7 words of information, similar to each function module control register, LF2407 assigns a fixed data memory address to it, such as mailbox 0, whose register is assigned as follows:

MBX0A to D(4-character storage space) Address: 7204 to 7207 Where: The identifier (set to 29 characters) is in MSGIDnH

In the last 13 bits and MSGIDnL.

3 Hardware circuit design and debugging

When designing the CAN communication circuit of LF2407, we should pay attention to a problem, that is, the supply voltage of 2407 is 3.3V, and the high output level of its CAN control module is only 3.3V, which is incompatible with the PCA80C250 level of CAN driver (5V), and should be paid attention to when adding isolation optocoupler in the design of the circuit. FIG. 2 shows the CAN communication schematic diagram of the lower computer side. Source

UUD148AE02 ABB current measurement controller module

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