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ten-channel junction box 36329 JB1010 installation manual to be the best by every measure free datasheet http:///
free datasheet http:///
contents 1.0 introduction .............................................................................................................. ........................1 2.0 mounting the enclosure .................................................................................................... ...............2 3.0 general wiring guide lines ................................................................................................ ...............2 4.0 wiring for new systems .................................................................................................... ..............3 5.0 trimming load cell output.................................................................................................. .............4 5.1 trimming individual cells ................................................................................................. ........................4 5.2 trimming cells in sections ................................................................................................ .......................4 5.3 trimming both individual cells and sections (full feature) ................................................................ .... 5 6.0 transient protection system ............................................................................................... .............6 7.0 switchbank swa and swb 1-8 switch functions ...........................................................................7 8.0 using the JB1010 in an existing system .................................................................................... .....8 9.0 schematic drawing of connector section (two load cells) ..........................................................9 copyright? 2010 rice lake weighing systems. all rights reserved. printed in the united states of america. speci cation subject to change without notice. december 2010 authorized distributors and their em ploy ees can view or download this manual from the rice lake weigh ing systems distributor site at www.rlws. com. free datasheet http:///
1 the JB1010 is a summing junction box and trimming device for up to ten strain gauge load cells. in new ap- plications that use a single junction box, the JB1010 can be custom con g ured to t many unique ap pli ca tions. it allows either signal or excitation trimming of three load cell arrangements: individual load cells, pairs of load cells in sec tions, or a combination of individual/and paired load cells. it allows use of an odd number of load cells without modi cation. as a re place ment board for existing applications in the eld?even as part of a multiple junction box trim ming network?the JB1010 can re place many boards. it is ide al as a single replacement product for many sep a rate boards for truck scales, tank scales, and track scales. this product can be used in multiple con g u ra tions. most of these con gurations are used to match existing systems using multiple junc tion boxes. when the JB1010 is used as a re place ment for existing junction boxes, the con guration characteristics of the other trim ming devices must be matched for proper operation. help for de ter min ing the characteristics of exist- ing devices will be found in section 8.0, using the JB1010 in an existing system . standard JB1010 units have a local tran sient sup pres sion net work that provides zone pro tec tion against most light ning induced tran sients, par tic u lar ly when used with cell wiring in metal conduit. in addition to the nema 4 frp junction box, the JB1010 is also available as a board-only product. 1.0 introduction figure 1-1. JB1010 board shd ?ig +sig ?xc +exc +exc ?xc +sig ?ig shd cell a cell b shd ?ig +sig ?xc +exc +exc ?xc +sig -sig shd shd ?ig +sig ?xc +exc +exc ?xc +sig ?ig shd cell a cell b shd ?ig +sig ?xc +exc +exc ?xc +sig ?ig shd cell a cell b shd -sig +sig ?xc +exc +exc -exc +sig ?ig shd cell a cell b +ex +se ?x ?e +si ?i shd cell 1a cell 3a cell/sect 4b cell 5a cell/sect 6b cell 7a cell/sect 8b cell 9a cell/sect 10b sect5 +exc sect5 ?xc sect4 +exc sect4 ?xc sect3 +exc sect3 ?xc sect2 +exc sect2 ?xc sect1 +exc sect1 ?xc to indicator section 1 section 2 section 3 section 4 section 5 JB1010 cell/sect 2b cell a cell b 100k 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 transient protection sw1b sw1a sw2b sw2a sw3b sw3a sw4b sw4a sw5b sw5a 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k free datasheet http:///
2 10.750" 8.750" 4.000" mounting mounting .313" 7.875" 2.0 mounting the enclosure the JB1010 has 4.0" x 8.75" mount- ing centers for #10 or 1/4" screws. mount the en clo sure for proper ser vice access. avoid mounting on weighbridges where vi bra tion and shock loads may loosen con nec tions and locations prone to ood ing. the standard JB1010 has wa ter- proof nylon cord grips to seal the ca bles and pro vide strain relief. ca ble diameters from 0.157" to 0.314" can be used with these grips. when in stall ing the cables into the enclosure, leave the strain re lief loose until the con nec tions have been rout ed with the en clo sure ful ly open. when com plet ed, tight en the grips with a wrench to pre vent wa ter from wicking into the box. to pre- vent water and other contaminants from entering the junction box, ll any unused cable grips with post screw plugs; p/n 19538. if cables will be exposed to uids, bend a short down ward loop in all cables near the cord grips so any uids draining down the cables will drip off before reaching the junction box (see figure 2-2). use a quality desiccant in the enclosure and replace it at least every six months. replace it more often if the en vi ron ment is very damp or is regularly wetted down. if using the transient protection grounding feature, install the ttings with a wrench and use an electrical grade lubricant such as wd-40 ? on threads and ttings. connect the ground lug to a single system ground rod (if locally connected) or to the ground- ing lug on the ac tran sient protector for the indicator or load cell power supply. 3.0 general wiring guide lines the JB1010 is a universal trimming board, designed to trim almost any set of new or existing load cells in nearly any con guration. to properly wire the JB1010, rst determine what kind of application you have. if the JB1010 is the only trimming junction box in a new system, continue on to the next page. if the JB1010 replaces one or more boards in an existing system, skip to section 8.0. free datasheet http:///
3 wire preparation the JB1010 uses spring-loaded, quick-connect wire terminals. these con nec tors are very re li- able if used properly. to prepare the wires, strip 3/8" of in su la tion from the in di vid u al wires. if the con duc tors are stranded wires, tin the ends of the wires using wire solder with a non-cor ro sive solder ux. inserting the wires into the terminals push down on the plastic lever with a pen or small screw driv er to compress the spring. see figure 3-1. install the wire into the com pres sion clamps. push the wire into the con nec tor until the wire is fully seated. make sure the clamp is resting on the stripped portion of the wire and not on the insulation. release the lever and pull on the wire to make sure it is secure. 4.0 wiring for new systems use the following procedure to set up a new system. 1. connect all cells with trimming disabled as shown in figure 4-1. 2. connect the cells to the junction box using the connectors marked sections 1 to 5, cell a and b. if pairs of load cells are to be trimmed in sec tions (as with truck or track scales), wire both cells to the same ten-position con- nec tor. if using less than ten cells, leave unused connectors empty. 3. if you have an odd number of load cells, connect the odd cell to a cell a input unused cell connector. con gure that con nec tor as shown in figure 4-2. you must disable the trim ming to any unused cell connectors, shown in figure 4-1. 4. connect the indicator cable to the terminal strip marked to in di ca tor . use six wire shielded cable and activate the remote sensing of the in di ca tor. remote sensing will compensate for resistance changes due to en vi ron men tal changes. 5. turn on the indicator. if the indicator reading appears stable, consider doing a tem po rary cal i bra tion. set a known weight on the scale deck and perform a cal i bra tion se quence to set the sen si tiv i ty of the meter to about the nal cal i bra tion required. if the sys tem fails to repeat to zero or ex hib its in sta bil i ty, you must x the problem before continuing . you cannot trim a system that will not re peat. if all you want to do is connect the cells in parallel, you are nished. do a nal calibration of the system using the zero and span ad just ments on the weight indicator. 6. if you want to trim the system for matched load cell output, go to step 1 on the following page. figure 3-1. wire terminals sect -exc swa to disable any channel no trimming 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 cell/sect "b" sect +exc swb cell "a" o f f o f f rocker down 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 sect +exc sect -exc swb swa odd number of cells signal trim individual (a) only 1k isolation resistors a is odd numbered cell b is unused cell "a" cell/sect "b" o f f o f f rocker down figure 4-1. figure 4-2. free datasheet http:///
4 5.0 trimming load cell output 5.1 trimming individual cells 1. determine what and how you want to trim. if the cells will be trimmed individually, we recommend a sig nal trim mode. while you can select either 2.5k or 1k iso la tion re sis tors, we recommend the 1k resistors. engage trim ming for only those ter mi nals which have load cells con nect ed. if using signal trim for individual cells with 1k iso la tion re sis tors, con- g ure the switch es as shown in figure 5-1. if using a different trimming combination (2.5k resisitors, section trim, or excitation trim), see section 7.0 complete switch settings chart . 2. turn all potentiometers fully clockwise. this produces the max i mum volt- age (minimum trim) on all cells. always begin with minimum trim; never ?center the pots.? 3. place a test weight on the scale di rect ly over each load cell in turn to de ter- mine which cell has the low est out put. this can be determined by watching the display on the indicator. this cell will be used as the system ref er ence and will not be trimmed. 4. trim individual load cells by placing the test weight over each individual cell in turn. turn the po ten ti- om e ter for that cell counterclockwise until the reading produced by the cell match es that of the ref er ence cell. trim odd-numbered cells using the po ten ti om e ters marked cell a ; trim even-numbered cells with the po ten ti om e ter marked cell/sect b . it doesn?t matter what the absolute cell outputs are, as long as they are the same. 5. readings are somewhat interactive, and you may have to repeat the trimming procedure to get extremely close matching of outputs. 6. once the cell outputs are the same, do a nal calibration of the system using the zero and span ad just- ments on the weight indicator. 5.2 trimming cells in sections trimming in sections assumes there are an even number of load cells to be trimmed in pairs. we recommend using the 1k signal trim section mode shown in fig ure 5-2 if possible. in this and other con guration modes using both section and signal trim, the cell/ sect b potentiometer trims both the a and b load cells. turn ing the cell/sect b po ten ti om e ter counterclockwise decreases output and trims the section com prised of the two load cells wired to the con nec tor below the swa switchbank. remember to disable any unused channels as shown in figure 4-1. figure 5-2. 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 cell "a" cell/sect "b" sect +exc sect -exc swb swa signal trim individual cells 1k isolation resistors o f f o f f rocker down 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 sect +exc sect -exc swb swa signal trim sections only 1k isolation resistors cell "a" cell/sect "b" o f f o f f rocker down free datasheet http:///
5 5.3 trimming both individual cells and sections (full feature) the following is the trimming procedure for a new installation with 1k double isolation full loadcell signal and section execitation trim. all other types of calibra- tion should be similar with only dipswitch changes for the required con guration. 1. connect all loadcells to the j-box. ? set dip switches swb position 1, 3, 4, 5, 6, 7 on, and 2 and 8 off. ? set dip switches swa all in the on position. 2. perform a reference point calibration. the scale should be stable and return to zero after calibration. if it does not do this, correct the problem in the scale before attempting to do any trimming of the scale. 3. enable the signal trim for all loadcells. ? set dip switches swb all in the on position. ? set dip switches swa position 1, 3, 5, 7 on, and 2, 4, 6, 8 off. 4. using pot a and pot b for their respective cells, trim each loadcell by placing a test weight on the loadcell that is being trimmed in each section and trim it's respective pot so that it matches other weight reading of the other loadcell in that section pair. do this to each section. the section weights do not have to match the actual test weight, just the other loadcell in that pair. 5. enable execitation trim for all loadcells ? set dip switches swb position 1 and 7 off. 6. using the pot for sect +exe and sect -exe, trim each section with a test weight so that it matches the other sections by using a test weight. the value on your indicator may not match your test weight actual weight. 7. perform a nal calibration. the scale should return back to zero and repeat. make any small adjustments as required. notes: loadcell a pot is a signal trim pot that can be set up as follows: ? with a2 and a4 off, do just the odd loadcell signal trim ? with a2, a4, a6, a8, and b2 on, the pot will do section signal trim. loadcell b pot is a signal trim pot that can be set up as follows: ? with a6 and a8 off, do just the even loadcell signal trim. ? with a2, a4, a6, a8, and b8 on, the pot will do section signal trim. section +exe pot adjust: ? with b7 off, pot will do section +exe trim section -exe pot adjust: ? with b1 off, pot will do section -exe trim sect +exc swa full feature individual trim: signal section trim: excitation 1k isolation resistors 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 swb cell "a" cell/sect "b" o f f o f f sect -exc rocker down free datasheet http:///
6 6.0 transient protection system the tran sient pro tec tion net work uses gas tubes selected for low leak age to ground in a network that has been prov en ef fec tive with load cells. con nect the ground stud on the junction-box enclosure to a suitable low im- ped ance ground. if a local ground is used, make sure that it is a single ground rod and not a ?net work?. the best place to ground is to the ground lug on the side of the tran sient suppressor which protects the source of the ex ci ta tion voltage. this keeps the system on a single point ground. if the gas tubes are hit by lightning or transients related to lightning, they may begin to leak to ground. this problem usually shows up as in sta bil i ty, drift, or an overload or underload con di tion on the in di ca tor. if this occurs, remove the ground wire and see if the problem persists. if it goes away, then the board may be bad or load cells may be damaged. use a quality volt me ter with a nano-sieman conductivity range to nd the leakage to ground and cor rect it. gas tubes that fail while pro tect ing against transients are intentionally sacri cial and not a war ran ty item. they are simply performing their function in the system. if you think the board may be damaged, record the current dip switch settings, then reset the dip switches to disable all trim ming as shown in figure 4-1. disconnect the ground wire from the JB1010. this ef fec tive ly hooks all cells in parallel, dis ables all trim and isolation, and removes any leakage source to ground. if the sys tem problems still persist, check the load cell cable and load cells for dam age. return the switches to their previous positions you have marked down once the problem has been re paired. if new cells have been added, they must be trimmed as part of re-calibration. free datasheet http:///
7 7.0 switchbank swa and swb 1-8 switch functions note: a is odd numbered cell, b is even numbered cell, unless otherwise noted. a w s 1 a t c e l e s r o t s i s e r n o i t a l o s i g i s - l l e c d a o l d d o n o i t a l o s i s m h o k 1 n o n o i t a l o s i s m h o k 5 . 2 f f o 2 a s s a p y b r o t s i s e r n o i t a l o s i g i s - l l e c d a o l d d o ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o i t a l o s i g i s - n o h c t i w s 1 a y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o 3 a t c e l e s r o t s i s e r n o i t a l o s i g i s + l l e c d a o l d d o n o i t a l o s i r o t s i s e r s m h o k 1 n o n o i t a l o s i r o t s i s e r s m h o k 5 . 2 f f o 4 a s s a p y b r o t s i s e r n o i t a l o s i g i s + l l e c d a o l d d o ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o i t a l o s i g i s + n o h c t i w s 3 a y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o 5 a t c e l e s r o t s i s e r n o i t a l o s i g i s - l l e c d a o l n e v e n o i t a l o s i s m h o k 1 n o n o i t a l o s i s m h o k 5 . 2 f f o 6 a s s a p y b r o t s i s e r n o i t a l o s i g i s - l l e c d a o l n e v e ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o t a l o s i g i s - n o h c t i w s 5 a y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o 7 a t c e l e s r o t s i s e r n o i t a l o s i g i s + l l e c d a o l n e v e n o i t a l o s i r o t s i s e r s m h o k 1 n o n o i t a l o s i r o t s i s e r s m h o k 5 . 2 f f o 8 a s s a p y b r o t s i s e r n o i t a l o s i g i s + l l e c d a o l n e v e ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o i t a l o s i g i s + n o h c t i w s 7 a y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o b w s 1 b m i r t e x e - n o i t c e s e l b a s i d f f o m i r t e x e - n o i t c e s n o n o m i r t e x e - n o i t c e s f f o 2 b e l b a n e m i r t l a n g i s l l e c d a o l d d o d e l b a n e m i r t l l e c d a o l d d o n o d e l b a s i d m i r t l a n g i s l l e c d a o l d d o f f o 3 b t c e l e s r o t s i s e r n o i t a l o s i g i s - l l e c d a o l n o i t c e s n o i t a l o s i n o i t c e s r o t s i s e r s m h o k 1 n o n o i t a l o s i n o i t c e s r o t s i s e r s m h o k . 2 f f o 4 b s s a p y b r o t s i s e r n o i t a l o s i g i s - l l e c d a o l n o i t c e s ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o i t a l o s i g i s - n o h c t i w s 3 b y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o 5 b t c e l e s r o t s i s e r n o i t a l o s i g i s + l l e c d a o l n o i t c e s n o i t a l o s i n o i t c e s r o t s i s e r s m h o k 1 n o n o i t a l o s i n o i t c e s r o t s i s e r s m h o k . 2 f f o 6 b s s a p y b r o t s i s e r n o i t a l o s i g i s + l l e c d a o l n o i t c e s ) n o i t a l o s i s m h o k 0 ( d e s s a p y b r o t s i s e r n o i t a l o s i g i s + n o h c t i w s 5 b y b d e t c e l e s r o t s i s e r n o i t a l o s i f f o 7 b m i r t e x e + n o i t c e s e l b a s i d f f o m i r t e x e + n o i t c e s n o n o m i r t e x e + n o i t c e s f f o 8 b e l b a n e m i r t l a n g i s l l e c d a o l n e v e d e l b a n e m i r t l l e c d a o l n e v e n o d e l b a s i d m i r t l a n g i s l l e c d a o l n e v e f f o 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 sect +exc sect -exc swb swa a is odd numbered cell b is even numbered cell cell "a" cell/sect "b" rocker down o f f o f f 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 sect +exc sect -exc swb swa a is odd numbered cell b is even numbered cell cell "a" cell/sect "b" rocker down o f f o f f free datasheet http:///
8 8.0 using the JB1010 in an existing system large vehicle scales often have two, three, or four junction boxes connected into a network. when servicing these scales, you don?t have a choice of what?s going to fail. when one of the junction boxes fails, it shuts the whole scale down. the service technician rarely has the right board with him to replace a third party junction board. as a universal board, the JB1010 can usually serve as a replacement. the JB1010 can be adapted to match almost any common (and some uncommon) summing boards. to do this, you can study the old board, look for isolation resistors, and see how the trimming works. sometimes, however, you have to make an intelligent guess. most large trimming boards use signal trim. if you see a large number of resistors on the circuit board, it is a good bet that the board is a signal trim board. most signal trim boards either have 2.5k or 1k isolation resistors. if the board has both individual cell and section trimming, then there are often two sets of isolation resistors. use the following strategy to identify and match existing trim boards: 1. are there many resistors on the existing board? if so, what is the value of the ones most prevalent on the board. these are almost always the isolation resistors. if you can?t read the value, guess 2.5k . 2. are there any adjustment potentiometers for individual cells? are there any adjustment po ten ti om e ters for sections? are there both? if there is only a single set of potentiometers, then use the value of the isolation resistors. guess 2.5k if you aren?t sure. if there are both individual and section trimpots, then choose the double isolation examples shown section 7.0. 3. if you can?t nd any isolation resistors, set up the board to disable trimming. read on to tell if the trim you have selected is correct. disable any unused channels. 4. if the junction box you are replacing has an expansion port, use any unused cell (disable trim on it rst) as the expansion output. in any case, power up the system and see if the indicator appears to work. if you get stable numbers, you are on the right track. if you are using signal trimming, you can tell if the isolation resistors match by the output of the cells. put a weight on cells connected to the existing box and record the value. put the same weight on a cell connected to the JB1010. if the reading is nearly the same, then the isolation resistor setting is probably correct. if the weight from the JB1010 is much too high, then the isolation resistors you have chosen are too low for the rest of the system or the system may have two layers of isolation resistors. if the weight from the JB1010 is much too low, then the isolation resistors you have chosen are too high for the rest of the system. you must match the isolation resistors as closely as possible so that the cell outputs are nearly the same. once this matching is done, then trim the total system like any other scale. free datasheet http:///
9 9.0 schematic drawing of connector section (two load cells) 100 10 100 10 2.49k 1.66k 1k/2.5k select bypass isolation 2.49k 1.66k 1k/2.5k select bypass isolation 2.49k 1.66k 1k/2.5k select bypass isolation 2.49k 1.66k 1k/2.5k select bypass isolation 2.49k 1.66k 1k/2.5k select bypass isolation 2.49k 1.66k 1k/2.5k select bypass isolation ref only 100k cell a 4.99k ?ignal buss +signal buss b3 b4 b6 b5 a1 a2 a3 a4 b2 ? +s ref only 100k - cell b 4.99k b8 ? +s a5 a6 a7 a8 +e +e ? ? ?xc buss +exc buss b1 b7 trim enable trim enable free datasheet http:///
free datasheet http:///
pn 36329 11/2011 free datasheet http:///

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