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Ask The Expert
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Have a question concerning material handling? Logistics? This website? Anything?
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MADC indicated a non volatile ram checksum error.
The MADC program indicated that the corrective action was to compare SRM configurations with EOA controller if calculate-checksum in rack setup menu of EOA controller is not the same, down-load aisle configurations from EOA.
When we tried to compare SRM configurations with EOA controller, we got a rack configuration error.
The next step was to down-load aisle configurations from EOA. After downloading from end of aisle, we got the same rack configuration error.
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Storage and Retrieval Machines
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After doing the download, you need to do another compare config. from MADC. This will set the checksum. If you continue to experience this error after setting the checksum, you will most likely need to replace the processor board in the crane.
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HK4000C Unit Load SRM
In the (year 2005) MADC configuration, the parameter for Shuttle vertical lift height (non-P&D) is set at 120 mm. When the SRM shuttle lifts a load during a pick, the total range of shuttle vertical motion is 160 mm.
Is there a hard-coded parameter in the SRM that instructs the SRM shuttle to position 40 mm below the defined Y-coordinate for that bin location, then lift 120 mm for a total vertical move of 160 mm?
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Storage and Retrieval Machines
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There are 2 configurable parameters under MADC for shuttle positioning while picking and depositing loads. The first, the vertical lift height, which you noted is the amount that the shuttle is raised above the value set for the load arm positions. The second parameter is the lower height. This is the amount that the shuttle travels below the set load arm height (I'm assuming it's set to 40 mm on your system). So for picking up a load, the S/RM would position 40 mm below the load, shuttle out and then raise a total of 160mm or 120 mm above the load arms and pull the load on board.
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Printing in MADC
Is there a way to print from MADC without having a printer connected to the parallel port?
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Storage and Retrieval Machines
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The short answer is No. What you can do if you want to print the information from a PC that does have a printer attached, is copy everything that's in the MADC directory to a disk or other medium, put it on another machine and select to print from MADC on that machine.
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Where to find literature for theoretical approach on AS/RS and what is appropriate for beginners in this field?
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Storage and Retrieval Machines
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In the learning center section of HK Planet, we have links to many articles. These include articles on the cost justification of a new AR/RS system and return on investment. Also check out some of the organizational links where additional articles may be found.
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WE run ragu sauce 12 26oz. jars in a case I,m looking for a case turner I have seen one at another plant that when a case goes around a 90 degree turn it automatically turns from side ways to long ways do you offer anything of this nature
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Conveyors and Sorters
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Yes, HK Systems has a standard case turner in our full offerings of case conveyor systems.
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We have two HK 750 mini loads used in our library book storage area. The operators are starting to get an increasing number of motion time out errors on one of the machines. After running a few tests, the problem mach.(B) seems to be stopping 3-4mm, and up to 5mm short of the horizontal address in both directions of travel, while the other mach.(A) stops short by 2-3mm of the horizontal address. I'm thinking that the machine is stopping outside it's window for pick or deposit causing the time-out error. Is there something in the MADC programing causing the mach. to stop early, or could there be a problem with the horizontal distance laser and reflector being out of original adjustment? Any suggestions on where to look next?
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Storage and Retrieval Machines
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We believe this could be a minimum speed issue. The newer OPINT End of Aisle software provides a method of adjusting this but with MADC, your only choice would be to modify the PLC code. An alternate way of changing this speed is by going to the horizontal drive controller and bumping up the minimum speed parameter from .3 to .5. This should be an easy change and is covered in the Production Test Plan which should have accompanied the SRM.
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A question for the electrical controls engineers: I read an article about H.K. Systems which stated that conveyor control circuits may migrate from 24V control back to 120V control in order to save money. The savings coming from not having to install a separate raceway as required when using 24V control (due to NEC class of wiring or noise issues). What are your thoughts on this and have you come to any other conclusions concerning the pro's and con's of 120V control versus 24V control. (of course we are talking in the context of a more basic control system which does not require analog signals or serial communication)....Thanks.
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Conveyors and Sorters
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Almost all control voltage solutions are supported by HK Systems, and in most applications guided by customer specifications. Generally, conveyor systems have large quantities of AC motors (230/460Vac) and therefore costly conduit for high voltage AC conductors. By using 120Vac control voltage, savings can be achieved by running the 120Vac control voltage conductors in the same motor conduit.
Other cost that can be incurred when using 24Vdc are control device current consumption that would require the addition of 24Vdc power supplies on the conveyor. (Installation and cost of power supplies). Sometimes, 24Vdc systems are associated with Quick Disconnect cables that connect the control devices to the control source. These cables can add up in cost plus the cable lengths are difficult to manage by the installation crew. Logistic problem adding up to more expense.
All that said - it is always HK Systems objective and recommnendation to supply the lowest cost solution to its customer which in most cases is the 120Vac solution. However, the customer or application may dictate otherwise. HK Systems supports all control voltage solutions.
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I am looking for a supplier of GMA style pallets that measure 44 X 48.
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Pallets
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One supplier that we have worked with on a prior project was Orbis. They have a couple of lines of ready made 44 x 48 plastic pallets, but these may not be suitable for transport on either AGVs or Conveyors. We had them do a custom GMA for the application which include steel reinforcement rods in the pallet to prevent sagging in the rack as well as load guides on the top surface for palletizing purposes. These custom models were transported via AGV and conveyor to the ASRS system.
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We have a GL40 AGV that is getting an "E Stop, Zone Over Run" error. It initially started going into frequent watchdogs, then went to the Over Run EStop. We have replaced Relay, DIO, and CPU boards without any success. Any idea where we can go from here.
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Automated Guided Vehicles
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Problems with the power supply are typically what causes watchdog and processor errors. Try replacing it first and if that doesn't work, check the connections from the power supply followed by all other connections.
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We have GL-40 AGVs I am having a problem on one loop. We are constantly getting B096 "Lost Guidance" errors. We have changed the LLDB and calibrated according to Mfg specs. When we set the guidance freq to 300mv the reading on the HCU status screen is above the 110-130 reccomendation. When we lower the setting to 275mv the readings are within specs but then they climb over a matter of a couple hours and the AGVs start loosing guidance (B096). Mutiple vehciles error at the same time.
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Automated Guided Vehicles
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We're guessing that you have a partial break in the wiring of one of your loops. If you are getting the error in close proximity to the same spot everytime, look for an expansion joint in the floor close to where the vehicle erred out as the most likely suspect spot. Another possibility is an expansion joint that any other vehicle may have just gone over causing vehicles further down line to err out. The thought is that the expansion joint moves just enough as the vehicle passes over to cause the wire to pull or possibly fray and expose the wiring under the insulation. Another check that can be made is the resistance of the loop itself. The largest recommended loop should not measure more than 13 ohms. Once the problem spot is isolated you will need to dig out the old grout and splice the wire in that spot. Finally, if you've already tried all of this, another suspect could be the power supply in the floor driver enclosure. This would also account for the drifting voltage that you're seeing.
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