Which parameters are monitored for pumps and mixing motors on the DCS?
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Generally, this side is used for monitoring the operating status as well as the fault status; is current monitoring also important? What kind of monitoring do you carry out on ordinary motors in a DCS? Are there any design manuals or specification requirements? I’m seeking practical or theoretical guidance; thank you!
It’s those things you mentioned: status, alarm, and at most, current
Are these requirements mainly of this kind specified in any manual or standard?
I’m not sure about that. To ensure safe and stable operation, it’s of course necessary to monitor parameters that have a quick impact; it might be a matter of experience, :)
There are no specific regulations, but for hazardous chemicals (I can’t remember exactly which), it’s necessary to monitor the mixing motor… We mainly monitor the current. The motor’s status is determined based on the current… Of course, it’s also possible to monitor or control start/stop operations; we use an inverter for control, with Profibus bus communication
Just call it by what it’s called. Personally, I think it’s not necessary to include a fault mechanism; the current depends on the size of the motor. For operational status: run it; do not start it (unless there are special requirements); stop it.
It’s mainly the current, but it’s better to include a current trend chart, as that allows for a more accurate understanding of the motor’s operating condition.
In the event of a fault, it is the motor protector or thermal relay that provides a contact connection to the DCS; however, thermal relays generally don’t seem to have many contacts, right? Have you guys done it?
Just do it casually; it’s a standard design. But I think a fault serves the same purpose as a shutdown – both are a waste of money.
Shouldn’t the decisions regarding which interlocking signals to implement be based on the electrical schematic provided by the electrical team?
For mixers, we generally monitor the current; for pumps, current is also something we pay attention to. If there are issues with the flow, the flow meter will show it as well. More advanced pumps may have monitoring for bearing temperature as well