Rice Lake CLS-420 Technical Manual
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Rice Lake CLS-420 Technical Manual

Rice Lake CLS-420 Technical Manual

420 cargo lift scale
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CLS-420
420 Cargo Lift Scale
Version 1.15
Technical Manual
PN 96483 Rev D

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Summary of Contents for Rice Lake CLS-420

  • Page 1 CLS-420 420 Cargo Lift Scale Version 1.15 Technical Manual PN 96483 Rev D...
  • Page 2 All information contained within this publication is, to the best of our knowledge, complete and accurate at the time of publication. Rice Lake Weighing Systems reserves the right to make changes to the technology, features, specifications and design of the equipment without notice.

  • Page 3: Table Of Contents

    3.3 CLS-420 Configuration ........
  • Page 4 CLS-420 Indicator (PN 162310) 5 Pin Wired with Power Switch .......

  • Page 5: Introduction

    The CLS-420 is a rugged, dependable cargo lift scale that can withstand many years of repeated use. When mounted on a forklift, the CLS-420 saves time and money by allowing loads to be weighed immediately instead of carrying the load to a floor scale.

  • Page 6: Safety

    Do not operate or work on this equipment unless this manual has been read and all instructions are understood. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Rice Lake Weighing Systems dealer for replacement manuals. WARNING Failure to heed may result in serious injury or death.

  • Page 7: Battery Disposal

    1.2.1 Battery Disposal When using Lithium-ion batteries, be sure to observe the following precautions for disposal as stated in the material safety data sheet regarding lithium-ion batteries. Figure 1-2. Material Safety Data Sheet - Lithium Ion Batteries...

  • Page 8: Considerations Before Installation

    CLS Classes and ID Plates During the initial sale or installation of the CLS-420, remind the customer that they must have an updated ID plate on the forklift stating the new lifting capacity and center of gravity information. This is required per OSHA rules and regulations.

  • Page 9: 420 Digital Indicator

    The indicator front panel consists of a large (1.8'', 44.5 mm), 6-digit, 7-segment LED display and 21 keys. Standard features of the CLS-420 include: • ON/OFF switch to increase battery life and cycle power to the junction box •...

  • Page 10: Modes Of Operation

    Use front panel setup to change setpoint and UNITS to set the time and date. Entering the front panel setup mode can be done without breaking the seal. CLS-420 Technical Manual...

  • Page 11: Indicator Operations

    Indicator Operations Basic 420 operations are summarized below. Toggle Gross/Net Mode Press GROSS to toggle the display mode between gross and net. If a tare value has been entered or acquired, the net value is the gross weight minus the tare. Toggle Units Press to switch between primary and secondary units.

  • Page 12: Accepting Weight Data To The Indicator

    The iQube2 uses a lithium-ion battery. See Section 2.9 on page Wireless communication from the indicator to the iQube2 which is located on the scales angle bracket. Lithium-Ion battery housed in a battery box. Figure 1-5. Wireless Version of Communication CLS-420 Technical Manual...

  • Page 13: Iqube2 Junction Box

    Junction Box The latest CLS-420 includes an updated version of the iQube2 junction box. This design is built to allow service technicians to easily service the unit in the field. It also replaces the older style j-boxes, originally used in the CLS- 420.

  • Page 14: Installation

    Section 2.3 on page The CLS-420 is shipped from the factory with the scale already calibrated to the indicator. Minimal recalibration and adjustments may be necessary once the scale is installed onto the fork lift. Calibration steps are contained in Section 3.2 on page...

  • Page 15: Unpacking One Scale Configuration

    2.1.1 Unpacking One Scale Configuration Follow the instructions in Figure 2-2 for unpacking a one scale configuration. Scale Hardware component box Protective wood covering Wood shipping pallet Front pallet support Exploded view of components Hardware component box plastic banding Front pallet Protective wood covering...

  • Page 16: Unpacking Two Scale Configuration

    DO NOT clip the plastic band from scale two until scale one is installed Step 6: Clip plastic bands from scale two. Step 7: Remove protective wood covering for second scale. Scale two is ready for installation. Figure 2-3. Shipping Pallets for Two Scales CLS-420 Technical Manual...

  • Page 17: Before Installation

    Some diesel models also provide 24 volts and electric forklifts provide 36 to 48 volts of power. The CLS-420 has a 9-36 VDC and a 10-60 VDC power supply option. Refer to the forklift user manual for its grounding specifications.

  • Page 18: Scale Base Installation

    Failure to properly torque the bottom plate retaining bolts may result in bodily harm or damage to WARNING equipment. 8. Adjust the shim bolts so there is a minimal clearance between the bottom cleats and the scale carriage of 0.020-inch thickness. This can be measured by using the included feeler gauge. CLS-420 Technical Manual...
  • Page 19 Failure to adjust shim bolts to proper clearance of 0.020 inches may result in binding, poor accuracy or Important improper fit of attachment to forklift. Illustration shown is with part of the flexure removed to show shim bolt location. Shim bolts Scale carriage Bottom cleat retaining bolts...

  • Page 20: Install Forks Onto Scale Assembly

    Used with Scale Cover Assembly PN 162340 Figure 2-7. Connecting The Coiled Cable 1. Loosen the bolt holding the cover to the scale assembly and remove cover. 2. Assemble loop clamp kit to the coiled interface cable. CLS-420 Technical Manual...

  • Page 21: Mounting The Indicator

    3. Route the coiled cable through the clips on backside of carriage toward middle. For proper coiled cable routing, tighten the clips. Set the other end of the cable aside until the power/communication box is installed (See Section 2.8.2 on page 20).

  • Page 22: Mount Kit And Indicator Installation

    Bonded Washer Bolt Side Brackets Figure 2-9. Mount Kit (PN 131630) To permanently lock the indicator mounting bolts, Rice Lake Weighing Systems recommends using ® Locktite 262. 1. Install side brackets to the mount plate, using isolation bumpers and hardware, in the order shown in Figure 2-9.

  • Page 23: Cable Connections

    The CLS series cargo lift scale will not operate on a positive ground. Refer to the forklift user’s manual for further verify grounding requirements. If using the wireless version of the CLS-420, the CLS scale uses a supplied lithium-ion battery to supply power, Section 2.9 on page 23.

  • Page 24: Power Cable Connection

    Do not route power cable close to fan blades. Do not route power cable close to objects that generate heat such as exhaust pipes. Figure 2-13. Areas to Avoid When Running Power Cable CLS-420 Technical Manual...

  • Page 25: Power Cable To Battery Connection

    2.8.3 Power Cable to Battery Connection 1. An in-line fuse is included with the CLS-420. The fuse comes enclosed in an in-line fuse holder with a terminal connector. Connect the fuse assembly to the power cable assembly using the terminal connectors.

  • Page 26: Route The Load Cell Coiled Interface Cable

    4. Check for proper signal cable clearance as the side shifter (if used), is moved back and forth. 5. After the power hook-up is completed, plug the power connector into the power/communication box. Do not obstruct the view of OSHA labels on the forklift when routing cables. CLS-420 Technical Manual...

  • Page 27: Grounding

    2.8.5 Grounding Except for the power cord, all cables routed through the cord grips should be grounded against the indicator enclosure. 1. Install the grounding clamps on the grounding bar, using the ground clamp screws. Do not tighten the screws at this time.

  • Page 28: Wireless Battery Option

    The CLS scale uses a supplied lithium-ion battery to supply power to the indicator when using a wireless version of the CLS-420. The lithium-ion battery is located on the top of the cover plate in a painted enclosure. Replacement part numbers are as follows: Part No.

  • Page 29: Charging The Lithium-Ion Battery

    2.11 Charging the Lithium-Ion Battery The lithium-ion battery comes with a two-bay, level-3 stand alone smart battery charger, a DC power jack and AC power cord as shown in Figure 2-22. To calibrate the battery pack, press the button on front label.

  • Page 30: Lithium-Ion Battery Specifications

    • Never use a modified or damaged charger • Use only with the specified products Storage • Store in a cool, dry and well ventilated area Disposal • Regulations vary for different regions. • Dispose of in accordance with local regulations CLS-420 Technical Manual...

  • Page 31: Cls-420 Calibration And Configuration

    CLS-420 Calibration and Configuration While the functionality remains the same for a standard 420 digital weight indicator, there are certain setup options that need to be changed for the proper functioning of the CLS-series cargo lift scale. the specific setup (menu) options, which include calibration, serial, program and print formatting are in the configuration section of this manual.

  • Page 32: Cls-420 Calibration

    CLS-420 Calibration The CLS-420 indicator can be calibrated using the front panel calibration procedure which consists of the following steps: • Zeroing the scale inclinometer LEFT TINE • Zero calibration • Entering the test weight value (left fork tine) • Calibration of cell #1 •...

  • Page 33: Devices Used For Lifting Of Calibration Weights

    To calibrate the indicator, the forklift tines must be in place as test weights are placed upon them. Use a level to ensure that the forklift tines are level prior to calibration. The test weight used to calibrate the CLS-420 cannot be greater than 2500 lb. To calibrate the indicator using the front panel, do the following: 1.

  • Page 34: Cls-420 Configuration

    Digital Filter Cutout Threshold – specifies the filter threshold, in display divisions. When a specified number of consecutive scale readings (DFSENS parameter) fall outside of this threshold, digital filtering is suspended. if NONE is selected, the filter is always enabled. 10DD 20DD 50DD 100DD 200DD 250DD Table 3-2. Configuration Menu Parameters CLS-420 Technical Manual...

  • Page 35: Format Menu

    Units – specifies primary units for displayed and printed weight. Values are: lb=pound; kg=kilogram, oz=ounce, TN=short ton; T=metric ton, g=gram Primary Default: lb Secondary Default: kg Indicators sold outside North America are configured with KG for both primary and secondary units NONE Table 3-3. Format Menu CLS-420 Calibration and Configuration...
  • Page 36 Only) choices via keyboard To toggle between primary and secondary units, press the UNITS key. Multipliers are pre-configured within the indicator. Manual entry is only necessary when NONE is selected under UNITS. Table 3-3. Format Menu (Continued) CLS-420 Technical Manual...

  • Page 37: Calibration Menu

    3-5, illustrates the different serial settings used for CLS functionality and a basic 420 indicator. 2LCELL The SSCALE parameter on the serial menu must be set to 2LCELL for use with the CLS-420 Cargo Lift Scale. If it is set to OFF, then the 420 indicator will function with a standard 420 calibration menu.
  • Page 38 0-255, in tenths of a second (10 = 1 second). ECHO OFF - EDP Echo – enables or disables echoing of the serial commands sent to the indicator. ON - Printer Table 3-6. Serial Menu Parameters (Continued) CLS-420 Technical Manual...
  • Page 39 Allows selection of time format and separator. See level three parameter for descriptions. TIMFMT Time Format – specifies the format used to display or print the time 24HOUR or 12HOUR TIMSEP Time Separator – specifies the time separator character COLAN or COMMA Table 3-7. Feature Menu Parameters CLS-420 Calibration and Configuration...

  • Page 40: Accumulate Function

    Front panel access to setpoints. Specify OFF if setpoints will not be tested. ON enables operator to turn setpoints on/off, change value, or change BANDVAL via front panel entry during weigh mode. Table 3-8. Setpoint Menu Parameters CLS-420 Technical Manual...

  • Page 41: Edp

    The P EDP command returns the current displayed weight value to the EDP port, along with the units identifier. If the indicator is in an under-range or overload condition, the weight value is replaced with (overload) or &&&&&& :::::: (under-range). CLS-420 Calibration and Configuration...

  • Page 42: Continuous Output (Stream) Format

    Table 3-10. Status Codes Returned on the ZZ Command Continuous Output (Stream) Format Figure 3-5 shows the continuous output format sent to the 420 printer port when the STREAM parameter (SERIAL menu) is set to either EDP or PRN. Figure 3-5. Continuous Output Data Format CLS-420 Technical Manual...

  • Page 43: Test Mode

    Press setup switch and Enter key at the same time to reset configuration and calibration parameters to factory default values. Load cells must be recalibrated before using the indicator (see Section 3.0 on page 27). Table 3-11. Test Mode Menu Functions CLS-420 Calibration and Configuration...

  • Page 44: Regulatory Mode Functions

    (on) with low voltage (0 VDC) and can be driven by TTL or 5V logic without additional hardware. Use the DIG IN menu to configure the digital inputs. LED’s on the CPU board light when digital inputs are active. CLS-420 Technical Manual...

  • Page 45: Cls-420 Abf Version

    Section 3.9.3 on page For sealing purposes, this screw does not need to be sealed. Power Connection Coiled Cable Connection Connection Connection Battery Positive 10-36V +V (7.5v) Battery Negative Chassis Ground Table 3-15. Cable Pin Outs CLS-420 Calibration and Configuration...

  • Page 46: Installed Wlan Interface

    The module is now set to factory defaults and in wired mode only. Reconfigure by connecting the indicator to a wired Ethernet network using the DeviceInstaller or browser. When complete, set the network mode back to Wireless Only. CLS-420 Technical Manual...

  • Page 47: Power The Carriage Junction Box

    • The module creates a unique DHCP name from its MAC address. See Section 3.9.2 on page • The baud rate of both serial channels is set to 19200 to match the settings of the Mega 8 indicators. • The input and output buffers are always flushed. CLS-420 Calibration and Configuration...

  • Page 48: 420 Core Firmware

    3°. Angle • displays to indicate an overload or under load. Over Under Reset the indicator if any settings become corrupt to return to default settings. See Section 3.9.3 on page CLS-420 Technical Manual...

  • Page 49: Ascii Character Chart

    & Ctrl-G ’ Ctrl-H Ctrl-I Ctrl-J Ctrl-K Ctrl-L Ctrl-M Ctrl-N Ctrl-O Ctrl-P Ctrl-Q Ctrl-R Ctrl-S Ctrl-T Ctrl-U Ctrl-V Ctrl-W Ctrl-X Ctrl-Y Ctrl-Z Ctrl-[ Ctrl-\ < Ctrl-] Ctrl-^ > Ctrl-_ Table 3-17. ASCII Character Chart (Part 1) CLS-420 Calibration and Configuration...
  • Page 50 « ∩ Å » ≡ É æ ± ≥ Æ ≤ ô ⌠ ö ⌡ ò û ÷ ù ˘≈ ÿ ° Ö • Ü ¢ £ ¥ ² ƒ Table 3-18. ASCII Character Chart (Part 2) CLS-420 Technical Manual...

  • Page 51: Front Panel Display Characters

    3.11 Front Panel Display Characters Figure 3-10 shows the 7-segment LED character set used to display alphanumeric characters on the 420 front panel. < & > Figure 3-10. Display Characters CLS-420 Calibration and Configuration...

  • Page 52: Conversion Factors For Secondary Units

    0.001000 metric tons metric tons 2204.62 pounds 1000.00 kilograms 1.10231 short tons 0.984207 long tons long tons 2240.00 pounds 1016.05 kilograms 1.12000 short tons 1.01605 metric tons NOTE: Multipliers in italics are preconfigured Table 3-19. Conversion Factors CLS-420 Technical Manual...

  • Page 53: Parts And Service

    Parts and Service 4.1 Daily Inspection Checklist  Check scale carriage for loose, worn, bent or broken components.  Inspect fork tines for damage.  Check locking pins on fork tines.  Inspect coiled cable for pinched, rubbed, stretched or damaged areas. ...

  • Page 54: Cargo Lift Scale Assembly

    Scale Cover Assembly 53308 Label,1.25 x 1.25 8000T 97118 Scale Cover Assembly 167250 Kit, Loop Clamp, Coiled Cable Assy (Inc 12-15) 150720 Kit, Loop Clamp, Coiled Cable Assy (Inc 12-16) Figure 4-2. Cargo Lift Scale Assembly Parts List CLS-420 Technical Manual...

  • Page 55: Load Cell Assembly

    4.2.1 Load Cell Assembly Figure 4-3. Load Cell Replacement Kit Parts Illustration Item No. Part No. Description 97883 Load Cell Replacement Kit (inc items 1, 2, 5, 4, 6 & 8) 109958 Hex Nut 15198 Spherical Washer Set Upper Block 92827 Flexure Rod 14665...

  • Page 56: Iqube2 Junction Box Assembly (Pn 167261), 28'' And 34'' Models

    Gasket, Access Cover 100968 CR-FHMS 0.164-32 x 0.5 x 0.5-N-SST 163765 Gasket, Access Cover 162384 Cover Plate, Access Hole 75062 Sealing Washer, #8 30623 Screw, 8-32NC x 7/16 52342 Label Table 4-2. iQube2 Junction Box Assembly (PN 167261) CLS-420 Technical Manual...

  • Page 57: Junction Box With Quick Disconnects (Pn 130826)

    4.2.3 Junction Box with Quick Disconnects (PN 130826) 10 1 This cable assembly connect to J4 This cable assembly connect to J5 Figure 4-5. Junction Box with Quick Disconnects (PN 130826) Item No Part No Description 130000 Bushing, PG7 Cord Grip 33188 Conn, Ring Terminal 1/4in 36719...

  • Page 58: Protective Angle With Battery Box Assembly

    4.2.4 Protective Angle with Battery Box Assembly Part of item 9 Figure 4-6. Protective Angle with Battery Box Parts Illustration CLS-420 Technical Manual...
  • Page 59 15627 Locknut, Black PCN9 97462 PCB Assembly, Battery 97463 Switch, Toggle sealed 126608 Insert, Foam Battery Box 99191 Decal, Rice Lake 15369 Standoff, FEM-FEM 6-32NC 36036 LED, Panel Mount Green 15626 Cable, Grip Black PG9 22087 Screw, Mach 6-32NCx3/8 125482...

  • Page 60: Indicator

    Indicator 4.3.1 CLS-420 Indicator (PN 162310) 5 Pin Wired with Power Switch Figure 4-7. CLS-420 Indicator Parts Illustration CLS-420 Technical Manual...
  • Page 61 Description 162073 Enclosure, 420 Indicator Modified For Power Switch 84397 Overlay, 420 Indicator Membrane Switch-Panel 99151 Board Assy, CPU Display CLS-420 With Software 84389 Bracket, Power Supply 420 Indicator 156613 Switch, Rocker Illuminated 121001 Coverplate, 420-CLS Inside Bottom Enclosure Holes...

  • Page 62: Cls 420 Indicator, 10 Pin Connector, Used With Iqube (98413)

    4.3.2 CLS 420 Indicator, 10 Pin Connector, Used With iQube (98413) Figure 4-8. CLS-420 Indicator Parts Illustration CLS-420 Technical Manual...
  • Page 63 Screw, MACH 6-32NCx1/4 99151 Board ASSY,CPU Display 15148 Washer, Lock 1/4 Regular 35088 Screw, Cap 1/4-20NCX1 HEX 96930 CLS-420 Mounting Bracket (see Figure 4-10) 97078 Backplate, 420 wireless 44676 Washer, Bonded Sealing 42640 Screw, Mach 1/4-28NF X 1/4 19538 Post, Slotted Black Seal...

  • Page 64: Mount Assembly For Cls-420 Indicator (Pn 162310)

    4.3.3 Mount Assembly for CLS-420 Indicator (PN 162310) Figure 4-9. Mount Assembly (PN 131630) Item Part No. Description 121003 Mounting Plate,420-CLS 98537 Bumper, Recessed Rubber 121004 Bracket, Side Angled 44676 Washer,Bonded Sealing 14634 Nut,Lock 1/4-20NC HEX 14984 Screw,Cap 1/4-20NCx1-3/4 Table 4-7. Mount Assembly Parts List...

  • Page 65: Mount Assembly For Cls-420 Indicator (Pn 98413)

    4.3.4 Mount Assembly for CLS-420 Indicator (PN 98413) Figure 4-10. Mount Assembly Parts Illustration Item No. Part No. Description 14656 Nut, 3/8-16NC Hex 15159 Washer, Lock, 3/8 Regular 96929 Clamp Plate, Indicator 14984 Screw, Cap 1/4-20NCx1-3/4 44676 Washer, Bonded Sealing...

  • Page 66: Cls-420 Indicator Cpu Board Replacement

    CLS-420 Indicator CPU Board Replacement The indicator enclosure must be opened to connect cables for load cells, communications, digital inputs, and analog output. The 420 has an on/off switch for the load cells and processor functions. Before opening the unit, ensure WARNING the power cord is disconnected from the forklift battery power source.

  • Page 67: Board Removal

    NEMA 4X Polycarbonate Junction Box Maintenance The CLS-420 scale can use a NEMA Type 4X polycarbonate junction box. The junction box is located between the front and back panel of the scale and is covered by a metal cover plate on the top of the scale. Use the following procedures for replacing a junction box on the CLS-420.
  • Page 68 4. Disconnect the wiring from the bottom board. 5. Loosen the screws and standoffs to remove bottom board and replace with new board. 6. Tighten the screws and standoff to secure the new board. CLS-420 Technical Manual...

  • Page 69: Junction Box Board Replacement - Two Board Style

    The bottom board which is shown in Figure 4-17 connects the wiring for both load cells one and two. Table 4-9 lists the wiring assignments for the bottom board. 7. Reconnect the wires to the bottom board per Figure 4-17 Table 4-9.
  • Page 70 KEY (N/C) POS (red) CLOCK (blue) DATA (brown) TEMP (green) NEG (black) Table 4-10. Top Board Wiring Connections J6 wiring is only used in the wireless version of the CLS series and goes directly to the battery box. CLS-420 Technical Manual...
  • Page 71 4.5.2 Junction Box Board Replacement and Wiring – One Board Style (December 2010 and Later) To access the board: 1. Using a Phillips head screwdriver, loosen the junction box cover and set the cover aside. 2. Disconnect the wiring from the board. 3.

  • Page 72: Junction Box Board Replacement And Wiring - One Board Style

    Tabulation 10 Pin Receptacle (18) Quick Connect Cable Assembly Wire Color Position on J2 Wire Color Position on J4 and J5 Green Black White Green Blue Black White Empty Brown Orange Empty +3.3V Table 4-11. Wiring Connections CLS-420 Technical Manual...

  • Page 73: Iqube2 Replacement

    IQube2 Junction Box Maintenance/Upgrade The iQube2 junction box is designed for use with the Rice Lake CLS-420 forklift scales and is a replacement for the junction box used on early models of the scale. The load cell connectors have been updated to improve serviceability.

  • Page 74: Iqube2 Junction Box Maintenance/Upgrade

    22. Align the iQube2 junction box with the bolt holes in the scale and use an Allen wrench to tighten. 23. Place the cover plate in place and secure with a bolt and washer, and seal the unit. 1. Locktite® is a registered trademark of Henkel Technologies. CLS-420 Technical Manual...

  • Page 75: Iqube2 Pcb Board Assembly Replacement

    TP26 TP25 C117 LED1 TVS3 TVS2 TVS4 C110 C115 Right load cell 2+ - connection C119 Coiled cable RS232_TX RICE LAKE TP14 connection RS232_RX TP15 ALIVE TP16 Vx.xx LED2 Left load cell connection LED3 JTAG C121 C120 D20 - PC board...

  • Page 76: Iqube2.3 Cross References

    4.6.3 iQube2.3 Cross References When identifying the correct junction box cross referenced part number, please provide the serial number of the scale so the Rice Lake Weighing Systems sales and service departments can track it to the correct top level part number sold.

  • Page 77: Required Tools For Replacing A Load Cell

    Load Cell Maintenance This section describes procedures for replacing a load cell. The CLS-420 uses Rice Lake’s load cell, PN 125543. The following instructions must be followed exactly to allow for seamless and easy load cell replacement. Take all necessary safety precautions when installing or replacing the scale parts including wearing safety WARNING shoes, protective eyewear, and using the proper tools.

  • Page 78: Load Cell Maintenance

    #11 Jam Nut Modified Wrench #12 Flexure Rod #13 Jam Nut #14 Hex Nut #15 Spherical Washer Set #16 Lower Block #17 Spherical Washer Set #18 Hex Nut #19 Hex Nut Figure 4-26. CLS-M Load Cell Assembly Parts Breakout CLS-420 Technical Manual...

  • Page 79: Load Cell Replacement

    Use the following steps to replace a load cell. 1. Raise the forklift carriage slightly for fork removal. 2. Slide the forks to the center of the carriage to allow for removal. Set forks aside. Slide forks to the middle of scale carriage Figure 4-27.
  • Page 80 Clean off any paint using a wire brush and oil. 15. Oil the spherical washers using a standard machine shop oil. 16. Disconnect the load cell cable from the junction box. 17. Loosen cable clips and remove the load cell. CLS-420 Technical Manual...
  • Page 81 Detach load cell clip from back plate of scale using a large screwdriver. Figure 4-31. Load Cell Cable Clips 18. Back off upper and lower overload stops using a 1 1/8" wrench. Overload stops looking at top view. Figure 4-32. Overload Stops 19.
  • Page 82 Figure 4-35. Use Chisel to Hold the Load Cell in Straight 25. Install the spherical washer set and hex nut on the bottom flexure rod, ensuring that the thick washer is mounted towards the mounting block. CLS-420 Technical Manual...
  • Page 83 Figure 4-36. Install Spherical Washer Set 26. Insert a flat-bladed screwdriver in the upper mounting block between the hole and the flexure rod, forcing the flexure rod in the same direction of the flexures. Insert the flat-blade screwdriver here to help center the flexure rod.
  • Page 84 37. Place a weight in the center of the fork and check side to side values. The weight values must be equal to complete the load cell replacement. 38. Tighten the overload stops when complete. 39. Calibrate the load cells (See Section 3.2 on page 28). CLS-420 Technical Manual...

  • Page 85: Forklift Flexure Troubleshooting - 28" And 34" Models

    4.7.3 Forklift Flexure Troubleshooting - 28" and 34" Models For Part Number 92828 The forklift flexure is designed to protect the load cell from damage in the forklift environment. Use the following steps if the forklift scale is out of tolerance or unable to return to zero on a consistent basis. 1.

  • Page 86: Cls-420 Wiring Diagrams

    4.7.4 CLS-420 Wiring Diagrams Figure 4-41. CLS-420 Indicator Wiring Diagram CLS-420 Technical Manual...

  • Page 87: Led Functions

    LED Functions Below is a list of diagnostic LEDs for the 420. See Figure 4-11 on page 62 for locations on the 420 CPU board. Serial Port Status LED1 (EDP Port) Flashing red = TXD activity Flashing green = RXD activity On steady or off = No activity LED2 (PRN Port) Flashing red = TXD activity...

  • Page 88: Troubleshooting

    Load cell errors Test mV/v levels, at 1.5 mV per 1,000 lb, test at 350 ohms Weight inaccurate Tare key has been activated At a stable zero weight, press the TARE key to return scale to normal weighing mode. CLS-420 Technical Manual...
  • Page 89 Symptom Possible Cause Action Scale not returning to zero (0) Forks are touching the ground. Lift forks off ground, press the Zero key. Debris between the scale and the forklift Remove debris carriage. Debris between the front and back scale Remove debris plates.
  • Page 90 May have to grind or torch side of forklift carriage due to previously installed side shift protection method. Scale displaying negative Forks are resting (even slightly) on the Lift forks up off floor. weight floor. CLS-420 Technical Manual...

  • Page 91: Error Messages

    Table 5-1 lists these messages and their meanings. Error Message Description Solution E A/D A/D physical error Call Rice Lake Weighing Systems (RLWS) Service. EEPERR EEPROM physical error VIREE Virgin EEPROM Use TEST menu to perform DEFLT (restore defaults) procedure, then calibrate scale.

  • Page 92: Cls-420 Specifications

    6.0 CLS-420 Specifications communication Power Consumption 1.5 A Printer Port Full duplex RS-232 or active transmit Fusing Internal short circuit protection only 20 mA current loop 2.5 A 5 x 20 mm fuse Both Ports 38400, 19200, 9600, 4800, 2400, Analog Specifications 1200, 600, 300 bps;...
  • Page 94 Specifications subject to change without notice. Rice Lake Weighing Systems is an ISO 9001 registered company. 230 W. Coleman St. • Rice Lake, WI 54868 • USA U.S. 800-472-6703 • Canada/Mexico 800-321-6703 • International 715-234-9171 • Europe +31 (0)26 472 1319 www.ricelake.com...

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