DC bus voltage is too high, the long-term running of the electrical components, such as the meter relay, light and so on are easily damaged due to overheating. And when the voltage is too low, it is easy to make the protection device malfunction or reject. General provisions of the allowable voltage change range is … Continue reading DC bus voltage is too high or too low to have any effect?

Drop signal not generally used to reflect the light plate and the alarm, which is characterized in that all the control loop, any signal is not restored, can emit light signal, to remind the personnel on duty or the operator according to the signal to find fault, not omission or false.

The central signal device has two kinds of accident signal and warning signal. The use of the accident signal is that when the circuit breaker is tripped, the circuit breaker can be used to send out the sound of the buzzer immediately, and the circuit breaker indicator lamp is flashing. The warning signal uses: in … Continue reading Central signaling device there are several? What is the use?

AC and DC circuit is not combined with a cable, the main reason is that the AC or DC loop are independent of the system, when a combination of AC and DC cables, AC and DC interfering each other, the insulation resistance of the DC current is reduced; at the same time, insulation system, and … Continue reading AC, DC circuit can apply a cable?

In order to achieve selectivity of over current protection should be the segments of the line protection operation principle of time steps to setting, that is from the power source nearer the end time is longer. Each differential of time is 0.5 seconds. Relay operation time and short-circuit current is independent of the size. Period … Continue reading What is the time limit? What is the counter time limit?

Selection of Megger, mainly is to select the voltage measuring range, high-voltageelectrical equipment required to use the high voltage megohmmeter. Low-voltage electrical equipment using low voltage ohmmeter. General principles are: electrical equipment selection of 500 kV 500~1000-Volt megohmmeter; vases, straps, switch should be used more than 2500 v Megger.Megger measuring range selection principles are: to … Continue reading How to choose the European table?

These days with DP network jump problem: should be a few remote IO station off the station after a very short period of time to recover automatically, because these IO security module on the station, so will lead to part of the emergency shutdown, and from the perspective of diagnostic information (multi 16#3942 16#3842), the … Continue reading DP network flash jump – how to diagnose system

405-OKA01-0AA0 AS4 PS 6ES7 and405-OKA01-0AA0 AS400 PS 6ES7Is there anything different in the two models?Best answerThis is the 400 system of DC power supply moduleThe two order number you posted on the top is the same.Is not posted on the wrongAnd now the DC input 10A specifications of the power module to upgrade to 6ES74050KA020AA0 … Continue reading 6ES7 405-OKA01-0AA0 AS4 PS

Recently the communication between two PLC, if you use SIEMENS's own words each cable programming procedure is very troublesome, for which a PLC after pulling down into another PLC again under the corresponding procedures, and online modify variable values and also not easy, so I would like to ask how to at the same time … Continue reading How to use a computer to achieve the same time on the two PLC access?