1771-A1B 故障现象:在CQM1H上电瞬间,频频出现空气开关跳闸,从而导致设备不能正常运行。
二、 出现故障的系统组成:
1、系统配置:CQM1H-CPU21
CQM1-PA206
CQM1-ID212*4
CQM1-OC222*3
2、模块规格:电源CQM1-PA206:100—240,50/60HZ
允许电压范围:85—264VAC
功耗:120VA以下
输出能力:5VDC,6A;24VDC,0.5A;(总30W)
CPU单元: CQM1H-CPU21 电流消耗:820MA
I/O单元: CQM1-ID212 电流消耗:85MA
CQM1-OC222 电流消耗:850MA
三、检查内容:1、PLC所有模块及CPU的电流消耗不能大于电源允许的**电流消耗(5VDC,6A)
2、PLC所有模块及CPU的功率消耗不能大于电源允许的**电流消耗(总30W)
3、上电时的**冲击电流不能大于连接空气开关所允许的**承载电流。
四、计算:
1. 总的电流消耗:0.82+0.085*4+0.85*3=3.72A<6.0A
2. 总的功率消耗:5VDC功率 0.085*4*5+0.85*3*5+0.85*5=18.55W<30W
24VDC功率 没有使用
3. 上电时冲击电流:因为电源的**功耗为120VA,是指在交流220V的情况下,而直流情况下**功耗是30W。由于UI1COSθ=30W,U I1=120VA,所以COSθ=0.25
又因为220*Imax*COSθ=220* Imax*0.25=18.55,可得Imax=0.33A
当上电时会产生一个浪涌电流,一般是5倍的**消耗电流。
所以上电时冲击电流为:5*Imax=5*0.33=1.65A>1A(空气开关电流)
五、结论:
客户用1A的空气开关接PLC,上电一瞬间的冲击电流大于1A会使空气开关跳闸。空气开关允许的**电流应该大于上电时的冲击电流,同时考虑一定的裕量,因此选择2A的空气开关比较合适,故建议客户更换一个2A的空气开关。Moog Slim Phatty Monophonic Analog Synthesizer
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