PFVL141C 3BSE024994R800 8,0 MN Millmate Roller Force Sensor


ABB PFVL141C 3BSE024994R800 8,0 MN

Category: SKU: PFVL141C Tag:
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Due to its low impedance and high output signal power the Millmate roll force load cell has an extremely low sensitivity to insulation defects and maintains its measuring accuracy at insulation levels down to 10 kΩ. The load cell output signal is calibrated for full interchangeability between load cells of the same type and size. The various types of load cells and the wide load range cover practically all conceivable roll force measurement applications.

Maintenance precautions during DCS system overhaul:
1. Thorough maintenance should be carried out on the DCS system during major repairs, including
(1) System power outage maintenance, including thorough dust cleaning, wiring modification, and other contents.
(2) For issues found during daily inspections and regular inspections that cannot be addressed in a timely manner, centralized handling should be carried out, such as system upgrades, configuration downloads, etc.
(3) Before maintenance, the system should backup the DCS system configuration and upload and backup the system operating parameters (such as PID).
(4) During the maintenance period, when changing the configuration, control, and interlocking program, it is necessary to organize relevant personnel in charge of process, equipment, electrical, and instrumentation to jointly participate in interlocking debugging and form interlocking debugging records.
(5) During maintenance, check whether the power supply and grounding system meet the requirements.
(6) Timely keep DCS maintenance records during major repairs.

2. System maintenance steps during major repairs
Step 1: Check the proofreading backup
Check if the software backup, configuration file backup, control and process data backup are correct and complete.
Step 2: Cut off the power supply in the following order
(1) After each operation station exits the real-time monitoring and operating system in sequence, turn off the power supply of the industrial control computer and display of the operation station;
(2) Turn off the power supply of the control station power box one by one;
(3) Turn off the power switches of each branch;
(4) Turn off the uninterruptible power supply (UPS) switch;
(5) Turn off the main power switch.

Step 3: Perform DCS power outage maintenance
(1) Power outage, blowing and maintenance of the operation station and control station. Including dust cleaning of components such as the internal control computer, control station cage, and power box.
(2) Maintain and eliminate faults found during daily and regular inspections that cannot be resolved in a timely manner.
(3) Instrument and circuit maintenance: including power supply lines, I/O signal lines, communication lines, terminal blocks, relays, safety barriers, etc. Ensure that all instruments are working properly, the wiring is reliably connected, and the markings are clear and correct.
(4) Maintenance of grounding system. This includes terminal inspection, grounding inspection of each operating station (industrial computer, display), grounding inspection of each control station (power supply, cage), and grounding resistance test.

Step 4: After completing all maintenance work on site and DCS, check and confirm whether the following conditions for re powering on are met
(1) Firstly, professionals such as process, electrical, equipment, and instrumentation should be contacted to jointly confirm whether the power on conditions for the DCS system are met.
(2) After confirming that the main power supply provided by the electrical system meets the requirements, close the power supply main circuit breaker and check the output voltage separately.
(3) Close each branch circuit breaker in the distribution box and check the output voltage separately.
(4) If equipped with a UPS or regulated power supply, check if the output voltage of the UPS or regulated power supply is normal.

Step 5: System power on and testing
(1) Start the engineer station, server station, and operation station, and simultaneously power on and inspect each power box of the system in sequence.
(2) Check whether each power box is working properly, whether the power fan is working, and whether the 5V and 24V indicator lights are normal.
(3) Check if the system software and application software folders and files of each computer are correct; There is no significant change in the remaining space on the hard drive and it has passed the disk surface test.
(4) Compile and download the modified configuration.
(5) Observe the presence of faults from the real-time monitoring fault diagnosis of each operating station.
(6) Open the control station cabinet door and observe if the card is working properly and if there is a fault display (the FAIL light is on).
(7) Power supply redundancy test
Open one redundant AC~220VAC main incoming line separately, and the other AC power supply circuits lose power, but the system should still be able to operate normally.
Turn on one redundant DC power supply separately, turn off other DC power supplies, and measure the voltage of 5V and 24V on the power terminals of each cage (rack) motherboard.
(8) Communication redundancy test: Connect one communication line of each redundant communication line separately (other communication lines disconnected), and use the download configuration function to test whether it is normal. If all are normal, it indicates that the communication network is normal.
(9) Card redundancy test: Check whether the redundancy is normal by plugging and unplugging mutually redundant cards with power.
Note: If one of the redundant main control cards or data transfer cards is removed and inserted back, it is necessary to wait for the data copy to be completed before dialing the other redundant card, otherwise serious consequences may occur during the production process.

Step 6: Control and process parameter inspection
(1) Verify the control and process parameters that have been successfully run (some parameters may be confused due to configuration modifications and downloads, and need to be re inputted).
(2) The parameters of replaced control circuits and newly added control circuits (programs) for on-site instruments (transmitters, regulating valves, etc.) need to be readjusted and debugged.

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