Electric pneumatic regulator common fault reason analysis

The stand or fall of pneumatic control valve performance will directly affect the quality of the whole control system work. Due to the pneumatic control valve is in direct contact with the modulated medium at the scene, the work environment is very bad, so easy to produce all kinds of faults. In the process of production, in addition to eliminate these problems at any time, also must carry out regular maintenance and preventive maintenance. Especially the use of pneumatic - valve at bad environment, more should pay attention to maintenance and preventive maintenance. Different forms of pneumatic control valve, and its failure and its reason is not the same. Servo amplifier, servo amplifier normal working state: (1) there is no input signal, the output voltage not to be. 2 open loop dead zone current & le; 160? 一个( Ⅱ type for 100? 一) 。 (3) input signal > 240? 一个( Ⅱ type for 150? 一) When the output load voltage is 205 ~ 220 v AC. (4) basic symmetric output voltage. If servo amplifier don't work properly, the parts might have the following several ways: (1) the front magnetic amplifier (1) when no signal input, double beat magnetic amplifier output through the potentiometer W101 adjustable to zero. Cannot be zero could be: B, resistance R110, R111 and electrolytic capacitor C101, C102 virtual soldering or desoldering. C, diode D105 ~ D108 virtual welding or damage. D, the offset current is not normal. E, asymmetric ac winding. (2) with the input signal, but no output or output may be asymmetric: B301 A, transformer for ac voltage of the secondary winding current asymmetry. B, resistance R110 and a change in the value of R111, electrolytic capacitor C110, C111 damage. C, ac field winding short circuit. D, diode D105 ~ D108 of individual pipe damage or virtual welding.