After a long run, the rotating part of the balance may have changed. Therefore, it is necessary to rotate the rotor with the impeller and other components assembled together to do dynamic balance test. 2, check the DC resistance of the electrical inspection: three-phase resistance unbalance shall not exceed 2%. Insulation resistance check: canned motor pump motor winding insulation resistance usually can reach more than 100M. Less than the 5M is required to analyze the reasons, the insulation is damp, or shielding sleeve for leaks points, such as sets of leak-free by the stator shield problem is entirely insulated damp, in need of drying, such as the stator shield cover problem, need to replace the mask sets. Installation place of 3g cell phone jammer depends on the site environment.Seven Type 1 shielded pump damage, graphite bearings, bushings, and thrust plate wear or lubricant shortage of dry grinding damage occurred. 2, the stator and rotor shield cover damage. Cover damage caused by shielding the main reasons for exceeding the limit bearing damage or wear caused by the stator and rotor shield set with rub and damage; Second, because the media has solid particles, chemical corrosion caused by welding, etc. leakage. 3, the stator winding damage. In addition to normal motor and the same: overload, inter-turn short circuit, caused by the breakdown of the stator windings to the causes of damage, there is also a result of the stator cover damage caused by media shield erosion damage to the motor winding to winding insulation. The cell phone jammer can use omnidirectional antenna of cell phone jammer. Eight, shielding the recovery of the pump in case of winding, or shield repair a damaged shield pump sets, you need to restore nature repair. Damage can be divided into two kinds: one is a good set of stator shield, and the occurrence of the stator winding, the phase breakdown, winding inter-turn short circuit, overload caused by winding burn. The other is leaving the stator shield cover damage to the stator windings resulting media intrusion damage to the stator windings. In either case, need to replace the stator coil and shielding sets. As the special structure of shield pump, replace the stator windings become more complex, must be removed, sealed at both ends of the stator shield sets and boards, in order to remove the stator windings. After winding repair, it must re-create a new mask set and seal plate. The cell phone jammer type is various.The special material requirements, and production of precision is also higher. 1, the stator winding replacement and replacement of normal motor stator winding is similar, but higher insulation level, they use a Class H insulation (the maximum allowable temperature of 180 ℃). QY Polyimide enameled wire, tank insulation, slot wedge, the insulating sleeve, lead wire and varnish, etc. need to use H-class insulation material. Replacement of the winding principles are: AS repair, especially the number of turns can not arbitrarily change, change will significantly affect the motor turns the main performance, close to the original wire as long as the total area can be, the form of winding, coil span and do not change. cell phone jammer can use jammer’s omnidirectional antenna which can changed into directional antenna if reducing interference with outside environment is needed.2 sets of replacement screen replacement repair shielding shielding sleeve is special about the difficulties and the pump, the pump is to ensure the quality of repair shielding key. To achieve the level of the original machine, you must pay attention to the following aspects.