Mechanical protection device SR489-P5-HI-A20-E-H


When a start command is issued, the auxiliary relay specified for start control will be activated for 1 second to start.

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Mechanical protection device SR489-P5-HI-A20-E-H

Mechanical protection device SR489-P5-HI-A20-E-H


These commands may be used to clear various historical data.
• CLEAR LAST TRIP DATA: The Last Trip Data may be cleared by executing this command.
• CLEAR MWh and Mvarh METERS: Executing this command will clear the MWh and Mvarh metering to zero.
• CLEAR PEAK DEMAND DATA: Execute this command to clear peak demand values.
• CLEAR RTD MAXIMUMS: All maximum RTD temperature measurements are stored and updated each time a new maximum temperature is established. Execute this command to clear the maximum values.
• CLEAR ANALOG I/P MIN/MAX: The minimum and maximum analog input values are stored for each Analog Input. Those minimum and maximum values may be cleared at any time.
• CLEAR TRIP COUNTERS: There are counters for each possible type of trip. Those counters may be cleared by executing this command.
• CLEAR EVENT RECORD: The event recorder saves the last 256 events, automatically overwriting the oldest event. If desired, all events can be cleared using this command to prevent confusion with old information.
• CLEAR GENERATOR INFORMATION: The number of thermal resets and the total generator running hours can be viewed in actual values. On a new installation, or if new equipment is installed, this information is cleared through this setpoint.
• CLEAR BREAKER INFORMATION: The total number of breaker operations can be viewed in actual values. On a new installation or if maintenance work is done on the breaker, this accumulator can be cleared with this setpoint.


Prepare for maintenance. The maintenance of the DCS system requires the following preparations:

(1) Maintenance personnel should be familiar with the structure and functional composition of the DCS system, understand the hardware knowledge of the system equipment, and proficiently master the DCS configuration software.

(2) System backup: including operating system, control system software, and logical configuration to ensure data integrity and up-to-date. Priority should be given to using optical disks, and using mobile hard drives, USB drives, etc. to ensure dedicated use of dedicated disks.

(3) Hardware reserve: Make an appropriate backup of vulnerable and short life components and key components, ensuring that there is no less than one spare part for each type of card and module, and store it according to the manufacturer’s requirements. If conditions permit, the spare parts should be verified.

(4) Organize the scope and schedule of product after-sales service, and form a technical support communication list for DCS manufacturers and design and debugging units.

The daily maintenance of the daily maintenance system is the foundation for the stable operation of DCS, mainly including the following points:

(1) According to the 25 countermeasures requirements, DL/T774 maintenance regulations and other documents, improve the DCS system management system.

(2) The electronic room is well sealed, ensuring that the temperature, humidity, and air cleanliness comply with the manufacturer’s regulations. The environmental temperature signal of the electronic room can be introduced into DCS monitoring.

(3) Check every day whether the fans in each cabinet of the system are working properly and whether the air ducts are blocked.

(4) Ensure the quality of the system’s power supply and provide reliable power to both power sources. When either power source is lost, an alarm will sound.

(5) It is prohibited to use wireless communication tools in the electronic room to avoid interference from electromagnetic fields on the system, and to avoid pulling or damaging equipment connection cables and communication cables.

(6) Standardize the management of DCS system software and application software, and software modifications, updates, and upgrades must comply with the approval authorization and responsible person system. Properly manage the USB ports and optical drives of the host in a closed manner.

(7) Do a good job of recording system data such as PID parameters and positive and negative effects of regulators for each control circuit.

(8) Check if the control host, monitor, mouse, keyboard, and other hardware are in good condition and if the image is normal. Check the fault diagnosis screen for any fault prompts.

(9) DCS equipment, including DPU and human-machine interface station, should be powered on one by one in a certain order. After each equipment is powered on and observed to be normal, the next equipment operation can be carried out.

(10) Regularly conduct online testing of the communication load rate of the DCS main system and all related systems connected to the main system. Check the status of redundant master-slave devices, and switch between master-slave devices regularly when conditions permit.

(11) Provide a Chinese description of important configuration pages; Develop test operation cards and ensure they are updated at all times. Standardize DCS configuration operations and minimize significant configuration modifications during operation.

(12) Regularly restart all human-machine interface stations one by one (recommended for around 2 to 3 months) to eliminate accumulated errors caused by long-term computer operation.

During the shutdown maintenance period of the unit, thorough maintenance should be carried out on the DCS system, mainly including:

(1) resetting the DPU, CPU, operator station, and data station of the DCS system one by one using the unit maintenance time; Delete invalid I/O points in the configuration and optimize the configuration.

(2) System redundancy testing: Conduct redundancy testing on redundant power supplies, servers, controllers, and communication networks. Pay attention to whether the switching between master and slave devices, network, and human-machine interface stations are normal during power outage of various equipment in the system; After system maintenance and re powering on, perform switching tests on each device.

(3) System dust removal: The system is shut down and all equipment is cleaned and blown, including the dust removal of the host, control station cage, cabinet filter screen, fan, and other components.

(4) Maintenance of grounding system. Including terminal inspection and ground resistance test; Maintenance of system power supply lines and testing of UPS power supply capacity; Pay attention to checking the CMOS battery level of the DPU host to prevent CMOS data loss.

(5) Check the interfaces between the DCS system and other systems, handle important signal redundancy, and implement one-way transmission and firewall measures for communication with other systems.

(6) System power on: After the system overhaul, the maintenance responsible person confirms that the conditions are met and strictly follows the power on steps.

Troubleshooting maintenance: DCS troubleshooting mainly involves the following tasks:

(1) fully anticipate various accidents, including DPU (CPU) crashes and network communication crashes, develop emergency plans, and carry out work in accordance with the plan in case of abnormalities.

(2) Handle DCS faults according to the manufacturer’s requirements. Before replacement, confirm that the card module model, address, jumper, etc. are consistent with the replaced card, and strictly follow the online replacement procedure.

(3) Fault maintenance should avoid rushing to repair, and DCS mandatory and isolation measures must be taken. Analysis and judgment should be made based on the self diagnostic alarms and fault phenomena of the DCS system, and the maintenance results should be verified by eliminating the alarms.

(4) In case of large-scale hardware faults, unknown reasons, or faults beyond the technical level of maintenance personnel, in addition to emergency replacement of spare parts, timely contact with the manufacturer should be made, and DCS technical support should further confirm and eliminate the faults.

Conclusion: The DCS system should undergo comprehensive management throughout the entire process from design, construction, debugging, and operation maintenance. As a system maintenance personnel, it is necessary to develop scientific and reasonable maintenance strategies and methods based on the system configuration and production operation characteristics.


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