原文所述，石家庄机务段的ＳＳ４改进型机车经常发生轮对弛缓，经分析是因防空转系统故障所致。对此说法，我认为有误。从原理电路看，防空转电路的输出是由电流给定记忆环节及防空转校正环节二部分相加组成，前者为同相跟随，后者相当于减法运算。无空转时，即为给定跟随；一 The original text, Shijiazhuang locomotive depot SS4 modified locomotive often flabby relaxation, the analysis is due to air-defense system failure. In my opinion, I think it is wrong. From the principle of circuit, the anti-idling circuit output is given by the current memory link and anti-idling turn the two parts of the correction link, the former to follow the same phase, which is equivalent to the subtraction. No idle time, that is given to follow;