Can the DW hydrogen compressor be started under pressure?

Since the electrical control part is a standard inverter application scheme, it is not the main explanation, in the daily operation, it is necessary to pay attention to the following problems: 1. Re-starting problem, because of the process characteristics, it is required that the hydrogen compressor has the ability to resist short-term and instantaneous power loss when shaking electricity, so other control circuits are equipped with the function of "anti-swaying", and 1 Because the hydrogen press is driven by an inverter, its anti-swaying power is divided into two parts, one is that the contactor at the front end of the inverter needs to avoid the shaking interference. Second, the inverter must be set up with a restart function, and the time must be reasonably matched with the time of the anti-sway controller. 2. One of the interlocking problems, in order to ensure the needs of the process and prevent the negative pressure from being pumped, when the rectifier device is running, if the total current of the rectifier is less than 18000A, the hydrogen compressor will be shut down by the DCS contact of the instrument.

In practice, it is necessary to consider whether the DCS control action of the instrument causes the hydrogen compressor to stop to avoid misjudgment. 3. The second interlocking problem is that when the rectifier device is not running, the control loop of the hydrogen compressor cannot be started due to the control of the instrument DCS. Only after the rectifier high-voltage switch is closed does the DCS signal to allow closing.

In practice, it is necessary to consider whether the DCS control contact is operating correctly despite operation. 4. Frequency instability, in the past operation, it was found that the output frequency of the inverter fluctuated greatly, and the system was unstable. At this time, it is necessary to check whether the 4-20mA signal input of the meter is normal, if it is normal, then the problem lies in the grounding shielding of the 4-20mA control cable.

It is necessary to carefully check whether the grounding is reliable, including whether the grounding of the shield layer falls off, whether the grounding of the inverter itself is reliable, etc.

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