I would like to ask the experts: for a 32-channel DI card with a relay board, is it necessary to remove the fuse for the channel being used separately when operating it on its own?
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I sincerely ask the experts here: for the relay board that comes with the 32-channel DI card, is it necessary to remove the fuse for that channel on the relay board when providing feedback on valve changes on-site (given that the relay board has a main fuse)?
Following our previous work practices*, the DI terminals were not disconnected from the fuse, but it’s important to adhere to standard procedures for on-site work: after unplugging the wires, wrap them up properly and try to avoid grounding them； If the DO terminal is grounded, it can cause the fuse to blow; I haven’t encountered any issues with fuses blowing in the case of DI
Work on live circuits is not allowed in explosion-proof areas; the wires on the cabinet side must be disconnected or the power turned off. In non-explosion-proof areas, work on live circuits is permissible. For DI points, it only matters whether they are connected or disconnected, and this has no impact.
Real-world case: Insulating the feedback wires for valve replacement on-site proved to be a good approach. During the process, the fuses in that circuit functioned properly, but the main fuse blew, resulting in a power loss for the entire relay board. Could you help analyze the reason for this?
Real-world case: Insulating the feedback wires for valve replacement on-site proved to be a good approach. During the process, the fuses in that circuit functioned properly, but the main fuse blew, resulting in a power loss for the entire relay board. Could you help analyze the reason for this?
This phenomenon is contrary to common sense; I can’t explain why. It is recommended to check whether there is power supplied to the main fuse circuit as well as whether any other electrical devices are connected to it.
Guys, please help analyze this. I’d be extremely grateful
It’s best to perform the operation with the power off; otherwise, sparks will be generated. You think you can handle it properly, but what if you can’t? According to regulations, the power must be turned off before opening the cover in explosion-proof areas. Fuses also burn out easily in non-explosion-proof areas.
Does this still require an analysis of the reasons? It can only be said that you haven’t done much work.
It’s good that the feedback circuit for the valve replacement on site was insulated. During the process, the fuses in that circuit worked fine, but the main fuse blew, resulting in a power loss across the entire relay board. Could you help analyze the reason for this? Make sure the sub-policy is not damaged; it’s the main policy that’s broken
Sparking also occurs when inserting or removing the fuse; is there any risk associated with this process?