My plant unit is two dc to fill two groups of electric screen, accumulator to comprise with dc system, straight communication drifting screen inputs power source to use device of switch of ASCO double power source.
Ever appeared for many times the following kinds of breakdown:
1, occurrence communication of insulation monitoring and warning device is interrupted.
Processing technique: At the beginning manufacturer comes over, installed the address of every sensor afresh afresh. Breakdown is eliminated. After passing to do not have a few days, communication interrupted breakdown to appear again. After manufacturer comes over, install sensor address afresh again, passing a few days is occurrence communication breakdown. Discover the software version that is insulation monitoring and warning device is too low later, after manufacturer comes over to replace a system, communication breakdown comb-out.
Reason: The software version of insulation monitoring and warning device is too low, do not match with hardware bring about.
2, the inside dc cent electric screen between distribution appears ground connection / negative ground connection.
Dc screen signs up for ground connection, leaf through condition of face plate insulation right now, examine out of service record, the spur track sky that finds fault leaves, go corresponding load goes checking. Because direct current source is control loop commonly, maintain loop to be communication commonly oneself. On corresponding terminal platoon, examine peripheral line, for instance the line of emergency stop button, line of feedback signal, line of the instruction (the probability that general and inside wire gives an issue is very small) . One ravels, tear open, measure with avometer next be opposite the ground / lose right voltage. Look whether voltage returns to normal (below normal circumstance / lose right voltage to be 110V) . Should ravel after some root, voltage returned to normal, search namely down this line, it is what component has ground contact. This moment is usable shake the watch measures insulation to affirm.
3, dc screen appears / lose right voltage to slant too.
This kind of circumstance is the most laborious, right voltage slants too, be opposite namely terrestrial electricity block is average under 100k Ω , Ω of prep above 25 K. This kind of circumstance makes low block ground connection without development direct perhaps ground contact. This kind of breakdown, reduce to be isolated from rightly commonly, meeting proper motion restores. My works falls wet commonly, dc screen can appear many minutes electric screen appears to slant too to ground voltage, restore ceaselessly again next, appear repeatedly. When after rain stops, him insulation restores.
This kind of circumstance, bring about for the emergency stop button outdoor commonly. Issue wet, because water proofing property of emergency stop button is not strong, bring about insulation to reduce. Those who strengthen pair of emergency stop button is perambulatory, had made the step that prevent rain, can solve commonly.
