Problems encountered during the startup of imported cryogenic liquid pumps
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Today, when I started the cryogenic liquid nitrogen pump, I found that it was running in reverse. The reason turned out to be that after the power was cut off and then restored, the parameters of the frequency converter were automatically reset to their factory settings. I was frustrated for a long time; eventually, I was able to fix the issue by resetting the parameters according to those of the liquid oxygen pump. I wonder why the factory settings are set to cause the pump to run in reverse
Could it be that the electrician connected the wires in reverse?
The frequency converters we use work in the same way; they have an option for forward and reverse operation. Be more careful – there’s no other solution.
It can’t be the case that every time there’s a power outage, everything has to be reset and reconfigured, right? It would be extremely troublesome if there were frequent power outages! I think there must be a problem with it; there surely is a better solution.
It can indeed be solved; a colleague who worked in electrical engineering managed to change the direction of operation of an inverter. But later, the department responsible for that inverter changed, and that colleague left. I didn’t pay much attention to it at the time – just drawing a diagram would do. Now, those people handling this task are even worse than me; even fixing that simple cabinet requires referring to the instructions, and this has led to many arguments.
It’s likely a fault reset; I found information online that I hope will be useful to you: http://www.gongkong.com/webpage/forum/200807/2008070123290100001-1.shtml We’ve encountered this issue before – after a power outage, the frequency converter couldn’t start on its own, which caused the entire factory to come to a halt; it was also due to incorrect parameter settings；
Well, how to put it… Our company’s frequency converters have also encountered this problem. It happened once, with the parameters changing automatically; we don’t know why. After that, it didn’t occur again
The manufacturer must have their reasons for making such a setting. There must be a solution to this; it’s very troublesome to have to reset the settings every time there’s a power outage.
Reply to 1# Snowy City: May I ask which manufacturer’s pump the original poster is using? Or which manufacturer makes the frequency converter?
Reply to 9#: For the main cooling unit in the air separation plant, I’ll check it on Sunday and let you know then
I’ve never seen it; this kind of issue doesn’t occur here after we finish the debugging