Pacific servo driver PC833-001-A

Description

Pacific servo driver PC833-001-A

Pacific servo driver PC833-001-A

There is no specific answer to the general question “What should the bandwidth be?” In general, the higher the velocity loop bandwidth, the faster the settling time will be and the better the rejection of torque disturbances (increased stiffness). Typically, velocity loop bandwidths range from 30 to 100 Hz. However, too high a bandwidth can lower the damping of resonance in mechanical linkages, causing excessive ringing and/or wear in coupled mechanics. Remember, it is the resulting motion at the end of any mechanical linkages that typically matters, not the response at the motor shaft.

Mechanical resonance is caused by springiness between motor inertia and load inertia. This may result from belts, flexible couplings, or the torsional stiffness of shafts. In general, the stiffer the couplings, the higher the resonance frequency and the easier it is to tune the system for good performance. If the velocity loop breaks into an oscillation at a frequency well above the calculated velocity loop bandwidth, a resonance problem may well exist. A second symptom is that the frequency of oscillation is relatively constant in the presence of changes to ARF0 and ARF1.

There are various communication methods between PLC and DCS. This article focuses on the application of Honeywell TDC3000, especially the application of SI serial interface card in this area, and provides application examples. Keywords: PLC, DCS, communication mode, SI IOP, FTA, expander. Introduction: The ethylene plant in the chemical park adopts the Honeywell TDC3000 DCS system, which involves communication issues with many PLCs. Because in production, operators need to understand the operation status of all systems through the DCS operation interface, the first and foremost of which is PLC, which is applied in many equipment, such as compressors, expanders, etc. The following will involve several communication methods based on Honeywell TDC3000: 1. Three communication methods between DCS and PLC: 1.1 LCN network connected to Data Gateway Port through Highway Gateway, as shown in the figure:

The LCN network is connected to each PLC through EPLCG (redundant):
The above two connection methods are suitable for large-scale PLC communication applications. Please refer to Honeywell for detailed implementation details. The following mainly involves the communication method SI (Serial Interface) for small-scale applications. 1.3 SI plays a crucial role in the communication between DCS and PLC. SI is a card that can be configured in the Application Process Module (APM) of the TDC3000 system, occupying a position equivalent to that of cards such as DI, DO, HLAI, etc., but without the actual Slot bit.

The connection diagram is as follows:

Communication interfaces and recognized devices: In APM, when the data type Array point is defined as an external IO operation, it can be connected to a certain SI card and obtain data from it, which is scanned from the PLC subsystem. Each SI IOP (IO processor of a serial interface card) can be connected to two FTAs through a power adapter. Each SI IOP has 32 “virtual” Slot bits, with the first 16 configured in FTA # 1 and the last 16 configured in FTA # 2. Each FTA can have different interfaces, such as Modbus and Allen Bradley interfaces. 2.1 Devices recognized by Modbus interface Modicon 984 PLC and other devices recognized by Honeywell, 2.2 Devices recognized by Allen Bradley interface Allen Bradley PLC-2, 3, and 5, etc.

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