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Description

The interlock should be positioned on its bracket so that with the contactor in its energized position, the interlock plunger (Figure 8) should not bottom. With the contactor in its de-energized position, there should be some clearance (C) between the interlock plunger and the interlock operating arm (Figure 8). Tip gaps and wipes, when new, should be as shown in Table 3. Replace contact tips when wipe reaches one-half of minimum specified. A universal interlock (Figure 9) having one set of normally open contacts and one set of normally closed contacts must be adjusted so that with one set of contacts just touching, there is at least l/64 inch of gap between the other set of contacts. REPLACING CONTACTS To replace removable contacts, lift the spring seat with the thumb and forefinger, and remove the operating plunger that supports the movable contacts.

Snap off the U-shaped keys, and the removable contacts can be removed and replaced. Care should be taken not to lose any parts or pieces during this operation. To replace a stationary contact, remove the terminal screw and lift the contact off the housing. Replace by pressing the new contact assembly into the molded insert and run the terminal screw to its seal position. Care should be taken to avoid changing the shape of this contact assembly in handling. Also, the shape should not change during operation.

The search for the cause of DCS faults should follow the principle of combining single fault testing and common mode fault search. It is necessary to analyze the impact of a certain equipment fault on the system and also take into account the common problems between equipment, so as to comprehensively and meticulously diagnose and handle faults; b. MAXDNA type DCS has powerful online processing functions, such as DP U online clearing configuration, online reinstallation, etc. These functions can provide assistance for fault handling during unit operation. Although there are significant risks involved in such work, as long as the safety measures are complete and strictly follow the procedures, it is still possible to safely and effectively handle DCS faults, greatly reducing unplanned unit shutdowns caused by DCS faults; C The working load and network communication load of DCS controllers should be strictly calculated and standardized during the design phase. When making design changes, full consideration should be given to the impact of factors such as redundancy of I/O points, adjustment loops, and number of alarms on DCS performance and safety. At the same time, it is necessary to test and verify the overall performance of DCS during the power plant debugging phase.

With the continuous application of MAXDNA type DCS system and the increase of power plant unit capacity, higher requirements are put forward for the data network transmission ability and safety of handling faults of DCS system. Some experiences of handling DCS data blockage faults in Guixi Power Plant can provide reference for industrial enterprises using similar equipment, promoting the improvement of DCS application and maintenance level in the industry.

IC600CB525
FC-TPSU-2430
IS200EPSMG1ABB
MKD090B-035-KG2-KN
3HAC024977-002
3HNM02168-1
IC754CSF15CTD
IS230TCISH9C
CC-PAON01
“57520001-EV DSCS 140”
3500/32
DS200LDCCH1AGA
AKM11B-BNMNC-00
PR6423/10R-030-CN
9907-014
DS200DDTBG2A
IS200BPIRG1AAA
4414 F/12
IC3600EPSU1
VMIVME-3122-400