Home
Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Home
Forums
Brown Cafe UPS Forum
UPS Discussions
"On Topic" Operations Management Jogging Knife Switches
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="wkmac" data-source="post: 2572682" data-attributes="member: 2189"><p>This does not happen in my facility as a result of how the line power to the conveyor is configured. Our line power is wired from the MCP into the safety disconnect and from there into a VFD and finally into the conveyor drive motor. Throwing the safety disconnect cuts power to the VFD which reads the power loss as a fault and thus it shuts off the entire conveyor train through a low voltage signal to the conveyor train interlock. One has to then clear the fault at the VFD, in this case position the disconnect in the "On" position and restart the conveyor. "Jogging the Safety Switch" which is not only against UPS methods but also NEMA safety standards is not an option in our building and doing so would actually be counter productive.</p><p></p><p>Our solution in a package volume overload condition is to flow the volume to another conveyor if possible until volume on the overloaded belt normalizes or we go as far as cut off the unload and then bump the entire conveyor train from the control console until problem is corrected and then restart the building. This incentivises the sort operations to not create an overload condition to begin.</p></blockquote><p></p>
[QUOTE="wkmac, post: 2572682, member: 2189"] This does not happen in my facility as a result of how the line power to the conveyor is configured. Our line power is wired from the MCP into the safety disconnect and from there into a VFD and finally into the conveyor drive motor. Throwing the safety disconnect cuts power to the VFD which reads the power loss as a fault and thus it shuts off the entire conveyor train through a low voltage signal to the conveyor train interlock. One has to then clear the fault at the VFD, in this case position the disconnect in the "On" position and restart the conveyor. "Jogging the Safety Switch" which is not only against UPS methods but also NEMA safety standards is not an option in our building and doing so would actually be counter productive. Our solution in a package volume overload condition is to flow the volume to another conveyor if possible until volume on the overloaded belt normalizes or we go as far as cut off the unload and then bump the entire conveyor train from the control console until problem is corrected and then restart the building. This incentivises the sort operations to not create an overload condition to begin. [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Brown Cafe UPS Forum
UPS Discussions
"On Topic" Operations Management Jogging Knife Switches
Top