GE IC698PSA350D power supply is suitable for applications that require more power

Description

Overvoltage Protection

Any output channel that exceeds the nominal output voltage by 15% or more will cause all outputs to latch off. The ON/OFF control switch or the AC input power must be recycled to reset Replaceable fuses are present on both the hot and neutral AC inputs. IC698PSA100 uses 4A/250V fuses. IC698PSA350 uses 8A/250V fuses. Note that the “A” version of the power supplies used 0.25” x 1.25” fuses. The “B” and any later versions use 5 x 20mm fuses.

Over Temperature and Air Flow Protection

The RX7i power supplies have internal temperature sensing that shuts down the output channels when overheated. The overtemperature failure allows automatic recovery once the unit cools down. The low capacity power supply is capable of operating at full capacity (100W) from 0 to 60ºC with only convection cooling. The high capacity power supply is capable of operating at full capacity (350W) from 0 to 60ºC with 70 CFM forced air cooling provided by a fan tray mounted below the system chassis. The high capacity 350W power supply can operate at a limited capacity with only convection cooling. See the temperature derating curves on the next page.

System Noise Immunity

The following steps must be taken to properly ground the PLC system to reduce the possibility of errors due to electrical noise.

1. Make sure that the power supply mounting screws are properly secured.

2. The GND terminal on the power supply must be connected to the GND terminal on either side of the rack using AWG #12 (3.33 mm2 ) wire. Use of a ring terminal and star washer is recommended.

3. The GND terminal on the rack must be connected to a good earth ground.

Note: Each RX7i module has a noise reduction gasket on the right side of the faceplate that maintains contact with the adjacent module or the rack. (RX7i power supplies have the noise strip on both sides.) Installing modules that do not have this strip makes the rack system more susceptible to electrical noise.

Data communication exchange
Data communication exchange mainly refers to the control system network and its data exchange form. DCS has inherent advantages in this regard. The “decentralization” of distributed systems is mainly reflected in independent controllers, while the “centralization” is mainly reflected in human-machine interaction devices with complete data, and it is the network that connects the decentralization and centralization into the distributed system. Therefore, from the early development of DCS, network has become the core technology direction of DCS manufacturers, and redundancy technology and narrowband transmission technology are the earliest successful research and application of DCS manufacturers. PLC is mainly designed according to independent devices, and its “network” is actually serial communication.

The development and widespread application of industrial Ethernet technology have bridged the gap between DCS and PLC networks in terms of form. On the surface, many DCS and PLCs have applied industrial Ethernet, but there is still a qualitative gap. Take the MODBUS-TCP used by many PLCs as an example. MODBUS is a serial communication protocol, not a network, no one has any doubts; Is MODBUS-TCP a network? Many people have doubts. Upon careful analysis, MODBUS-TCP is a communication method that loads the MODBUS communication protocol onto the TCP protocol of Ethernet. Although it has the appearance of a network, it still has a management mode of one master and multiple slaves, and a data table transmission structure. As for DCS, taking the ELIN network with a network of 6000+DCS as an example, although it is also based on industrial Ethernet, its application layer protocol is the ownerless token LIN network protocol accumulated by European companies for nearly 30 years, which has been successfully applied in 1M OLIN, 2.5M, and 20M ARCNET for a long time. On ELIN, all stations are equal and there are no major management stations. Moreover, data communication is structured data on a module by module basis, and data management capabilities are comparable to non data table methods.

Taking the PID module as an example, the basic data includes PV, SP, and OP. Using a data table transmission method, you must first define the data addresses of PV, SP, and OP as 01, 02, and 03. Other stations also receive data in a data table format, but what data is 01? What data is 02? The data definition table must be used to restore. The management method of data tables is cumbersome and prone to errors. Using this method to manage tens of thousands of points of data in a large system and flattening them in a data table is very frightening. And NETWORK 6000+DCS uses modular structured management to process a PID as a module. To access its PV value, first access its module and manage it in the form of PID. PV. This centralizes all tiled data into small boxes for classification and attribution, and manages them in a modular and component manner, greatly improving management efficiency.

The problem of PLC data communication and exchange mainly stems from the long-term development of PLC as an independent device without a system concept; Moreover, it is mainly applied in small control systems, and the problems are not clearly exposed, so the development is slow. At present, there are also some large PLCs that have improved in this area, but it will take a considerable process to reach the level of DCS.