FWC DWM-IV User manual

Operator Manual
Model DWM-IV

Table of Contents
Standard Features:...........................................................................................................3
Options: ......................................................................................................................4
Specifications:.............................................................................................................4
Compliance with FCC Rules ...........................................................................................6
Warranty .........................................................................................................................6
Installation Re uirements................................................................................................7
Unpacking and Inspection...............................................................................................7
Handbook 44 Re uirements ............................................................................................7
Installation Instructions for Grounding Kit ......................................................................8
Operating Instructions.....................................................................................................9
A. DISPLAY...............................................................................................................9
B. STATUS INDICATORS ........................................................................................9
C. KEYBOARD..........................................................................................................9
D. FRONT PANEL FUNCTIONS ............................................................................ 11
Front Panel Data Entry .......................................................................................... 13
How to Enter and Exit System Setup............................................................................. 17
Configuration Setting Descriptions............................................................................ 18
Set-Up Procedure ...................................................................................................... 26
Calibration Procedure................................................................................................ 35
Error Codes During Calibration............................................................................. 38
Error Displays ........................................................................................................... 38
Programming Steps Summary....................................................................................... 39
Serial Bi-Directional Communications.......................................................................... 42
Remote Control Inputs .................................................................................................. 43
Data Output Formats..................................................................................................... 43
Custom Print Format Programming............................................................................... 48
Print Codes and Descriptions ........................................................................................ 49
Standard Current Loop Interface ................................................................................... 52
Connecting a Computer or Terminal to Your DWM-IV................................................. 52
Data Interface Connector Chart ..................................................................................... 53
Glossary........................................................................................................................55
U.S. ASCII Character Set.............................................................................................. 57

Standard Features:
Keyboard programmable setup: All select functions, setup and calibration are
programmable through the keyboard. Access to setup mode is enabled by internal switch.
Pushbutton Zero: Used for establishing gross zero.
Pushbutton Tare: Automatically tares the weight of object placed on the scale and
places scale in the net mode.
uto Zero Tracking: Automatically tracks zero (0) within 1/4 digit to ensure a stable
zero (0) over time.
Gross/Net Pushbutton: View net and gross weight when tare weight has been entered.
Print Pushbutton: Transmits data out of serial port.
Numeric ID: Single register to enter up to seven (7) digits of numeric identification.
CN: Six (6) digit consecutive number increments each time the [PRINT] button is
pressed.
Recall Tare Pushbutton: Used for recall viewing of tare weights.
Keyboard Tare Pushbutton: 10 Tare look-up (09) to enter predetermined tare values.
PC WT Entry: 9 piece weight look-up (19) determines count by entering pre-
determined piece weight.
Weight ccumulation: 10 weight accumulation registers with subtotal.
Digital Filter: Compensates for vibration or motion, keyboard selected from 1 to 32
updates per average.

Data Output: Serial ASCII 20 mA current loop with selectable baud rates (15019.2K),
selectable auto or manual print, continuous data out, or bi-directional communication.
Remote Control Inputs: Zero, Tare, Net/Gross, Print. Re uires voltage-free contacts.
Enclosure: NEMA-12 wall mount/dust-tight.
Options:
Outputs: Dual port serial RS-232, RS-422, RS-485, and/or 20mA current loop; Parallel
BCD; Analog 4-20mA or 0-5 VDC.
Time and Date: Battery backed up time and date with selectable 12 or 24 hour mode.
Setpoints: Up to six (6) single speed or three (3) two speed setpoints with Zero
Interlock and Fill Complete output.
Table Stand: Provides 60 degree angle mount stand for wall mount enclosure.
N4S Enclosure: NEMA-4 Stainless Steel watertight wall mount enclosure.
Custom Systems: Flex-Weigh offers full engineering support for customized systems.
Contact your local dealer for further details.
Specifications:
Keyboard: Sealed keyboard with tactile keys.
Display: 6 digits and (-) sign. Seven (7) segment, 0.5" high blue vacuum fluorescent
type, with annunciators for: function select, center zero, tare, net, pieces, F1, and F2.
Internal Raw Count: 100,000 counts maximum.
Display Resolution: 1 part in 10,000 maximum Legal for Trade, 1 part in 24,000
extended, 1 part in 100,000 maximum in high resolution mode.
Display Increments: x1, x2, x5, x10, x20, x50, x100.
Decimal Point Location: Selectable 14 places to the left.
/D Conversion Rate: 15 updates per second.
Response Time: Zero (0) to full scale capacity, selectable to 0.5 to 4 seconds.
Display Rate: Selectable 0.25, 0.5, 1, 2, 5, 10, or 20 updates per second.

Over Capacity: Displays OLOADat 102% of Full Scale Capacity.
Center Zero: Light indication when scale is within +/-0.25 digit of center of zero (0).
Load Cell Excitation: 15 VDC, powers up to twelve (12) 350 ohm load cells.
Input Sensitivity: 0.6 to 12 microvolts per digit.
ccuracy: 0.01% of full scale or +/- one digit, whichever is greater.
Data Output: Serial ASCII 20 mA current loop with selectable baud rates (15019.2K),
selectable auto or manual print, continuous data out, or bi-directional communication.
Operating Temperature: -10 degrees C to +40 degrees C (+14°F to +104°F).
Humidity: Maximum: 95% RH non-condensing.
Power: 120 or 240 VAC, 5060 Hz, 25 watts.
Fuse: 1/4A @ 120 VAC, 1/8A @ 240 VAC.
Dimensions: 12" (30.48 cm) H x 10" (25.4 cm) W x 5" (12.7 cm) D.
Weight: 16 lb (7.25 kg).

Compliance with FCC Rules
Please note that this e uipment generates, uses and can radiate radio fre uency energy. If
this e uipment is not installed and used in accordance with the instruction manual you are
warned that it may cause interference to radio communications. This unit has been type
tested and found to comply with the limits for a Class B computing device in accordance
with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference in a commercial environment.
However, if this unit is operated in a residential area, it is likely to cause interference and
under these circumstances the user will be re uired to take whatever measures are
necessary to eliminate the interference, at his/her own cost.
Warranty
Flex-Weigh Corporation (hereinafter called FWC) warrants that articles, materials and
work furnished by them will conform to specifications, drawings and to other data cited,
further stipulating that such material and workmanship shall be free from defect. FWC
will repair or replace at its discretion, free of charge, any e uipment covered by this
warranty which is returned within one year of installation or fifteen months after initial
delivery and which upon examination proves to be defective in nature or workmanship.
This warranty does not apply to any FWC product that has been:
1) Repaired or modified by anyone other than someone authorized by FWC if in their
judgment such repair or modification has detrimentally affected the performance or
reliability of the product.
2) Improperly installed or not adjusted in accordance with instructions provided by FWC.
3) Mishandled, abused, or in the judgment of FWC has been exposed to an environment
for which the product was not designed.
This warranty constitutes FWCs exclusive warranty, there being no other warranties
expressed or implied, including any warranty of merchantability or fitness for a particular
purpose.

Installation Requirements
Maximum performance is guaranteed only when installation of the scale system is
performed by a ualified scale technician. For best performance, the AC mains supplying
the scale system must be an isolated circuit free from other loads and not in close
proximity to inductive or SCR controls.
WARNING: THIS SCALE MUST BE OPERATED FROM AN AC POWER SOURCE
THAT PROVIDES AN EARTH GROUND FOR THE SCALE CHASSIS TO ENSURE
SAFE OPERATION AND PROPER PERFORMANCE. THE POWER CORD IS THE
POWER DISCONNECT DEVICE. CARE SHOULD BE TAKEN NOT TO BLOCK
ACCESS TO THE OUTLET IN CASE OF AN EMERGENCY.
Unpacking and Inspection
Remove the weightmeter display from its shipping container. Discard the protective
materials. Do not plug the meter into an AC voltage source until completing the
inspection of the instrument. With a proper screw driver, loosen the screws holding the
lid clasps in place. Open the lid and visually inspect to make sure there are not signs of
shipping damage such as broken wires, loose components, or fractured printed circuit
boards. This visual inspection is necessary if a shipping claim needs to be processed.
Every care has been taken to minimize potential damage that could occur if rough
handling is experienced in transit.
Handbook Requirements
The following applies to Model DWM-IV weightmeters used on Handbook 44
applications.
1) Wire seal provision is re uired on access lid.
2) Piece count feature must be disabled (Step F5.0 of SET-UP procedure).
3) RFI (Radio Fre uency Interference) protection kit option is re uired in areas where
RFI is present.

Installation Instructions for Grounding Kit
Part No. 99411-399
1. Insert the 5/8 long screw through the hole in the panel as shown.
2. Secure screw with kep nut. The kep nut must bite into the paint to insure electrical
continuity.
3. Attach the ground wire and secure with 1032 hex nut as shown.
4. Install the lockwasher under one of the screws securing the panel to insure grounding
between the panel and the enclosure.
5. Attach grounding label included adjacent to the bolt as shown.
Rev. D
Hoffman Engineering Company
900 Ehlen Drive
Anoka, Minnesota, 55303-7054, U.S.A.
Phone [phone] Fax [phone]

Operating Instructions
A. DISPLAY
The display indicates the arithmetic result of the analog signal derived from the scale
base. The display indicates: OLOAD at 102% of capacity and above.
B. STATUS INDICATORS
The DWM-IV illuminates a triangular arrow above the proper legend for current status of
the display. The status indicators are:
1. SEL - illuminated while accessing the front panel options.
2. ZERO - illuminated when the scale base is within +/- 0.25 increment of zero
3. TARE - when lit, indicates that a tare value is being displayed.
4. NET - when lit, indicates that a non-zero tare value is currently being used.
5. PIECES - illuminated when in the piece count mode to indicate that the display is
showing pieces instead of weight.
6. F1 - Future option. (not labeled on standard units)
7. F2 - Future option. (not labeled on standard units)
C. KEYBOARD
1. [Zero] Button: This button allows re-zeroing of the scale over a +/- 2% range of scale
capacity or full scale capacity (programmable). During set-up, the automatic zero tacking
may be disabled if desired. This button must be pressed for approximately two seconds to
capture zero.
2. [Tare] Button: This button is used to remove the container weight value from the
weight indication. When pressed with weight on the scale no motion present, this tare
value will be stored and subtracted from the gross weight to indicate a net weight display
of zero. Pressing the [TARE] button places the system in net weighing mode.

3. [Gross/Net] Button: If a tare has been entered, this button will alternately select
between the gross and net weight modes. If the tare has been cleared to zero, the DWM-
IV will automatically select the gross weight mode. This button will be inactive while the
tare value remains e ual to zero.
4. [Print] Button: This button initiates a print cycle to an external peripheral device such
as a ticket printer or computer. The output format may be programmed during the set-up
procedure.
5. [Recall] Tare: The instrument is e uipped with a key board to provide a means of
entering a known tare weight. Up to six (6) digits of digital tare may be entered up to the
full capacity. Entries greater than full capacity will be cleared to zero. The least
significant digit (LSD) is automatically rounded to conform to the pre-programmed
instrument LSD. Press the [RECALL TARE] button then a numeric button corresponding
to the tare register desired (if ten (10) tare look-up feature is enabled) and the [ENTER]
button. The previously displayed data will be shown. Enter the re uired value and press
[ENTER]. This value is then stored in memory. A non-zero value places the system in net
weighing mode.
6. [Select]: This button is used to access the pre-programmed front panel functions as
indicated on the corresponding buttons zero through nine.
7. [Clear]: Used to clear a mistaken entry while in one of the data entry modes.
8. [Enter]: This button is used to store data into memory and also to se uence through the
data entry procedure.

D. FRONT PANEL FUNCTIONS
TEST  Allows the operator to test the integrity of the weight display by se uentially
lighting each segment of all digits, all segments, and each arrow indicator. These results
show that all drivers and displays operate in both the on and the off conditions.
PRESET  The DWM-IV provides up to eight (8) outputs which may be used to control
solid state relays. The system may be configured for three (3) two-speed or six (6) single-
speed, cascaded setpoints. In addition, zero interlock and FILL COMPLETE outputs are
provided which, when used with additional, external hardware, may be used to simplify
batching operations. Enter the weight value desired for each preset starting with number
zero through to number three (3) or six (6). The zero interlock preset is number zero. If it
is desired to merely view the presets already in memory, simply press [ENTER] without
pressing any numeric buttons or [CLEAR]. The weight values will be displayed from
zero (0) to three (3) or six (6) then return to normal weight display mode.
DRIBBLE  The value entered as the dribble amount is subtracted from the final
setpoint (PRESET-PREACT) and this amount is the fast feed cut-off setpoint. It
represents the amount of material desired to be filled at the slow rate. The values are
entered in the manner as described for PRESET above where number one (1) corresponds
to PRESET number one (1) above, etc. This function is only active if the two-speed
configuration has been selected.
PREACT  Enter the value of weight that is to be subtracted from the preset value in
computing the final cut-off value for the output. This value represents the amount of in-
flight material.
T/D  This function allows the operator to enter the current time and date for print-out
purposes. The time and date option must be installed and enabled for this feature to be
operative.

SUBTOTAL  The DWM-IV contains ten (10) registers for weight accumulation. The
subtotal of all previously recorded weights or pieces may be recalled and/or printed using
this button. The totals registers remain intact after use.
TOTAL  The totals may be viewed/printed as described in SUBTOTAL above with the
exception that after printing, the current total register is cleared to zero along with the
consecutive numbering register. The current register used for totalizing is selected by this
function.
ID  The ID function allows the operator to enter up to seven (7) digits of numeric ID.
The current value of ID is displayed and may be changed by use of the numeric and
[ENTER] buttons.
CN  The consecutive number may be viewed or changed using this button. The CN is
automatically cleared to zero by totalizing but may be initialized to any value by use of
the numeric buttons. The CN increments before a print cycle begins, as initiated by the
[PRINT] button.
PC WT  This function allows the instrument to be used for piece counting by entering
the known weight per piece. This mode is automatically selected if the current piece
weight register is OTHER than zero. The front panel indicator for PIECES will illuminate
while in the pieces mode. Any of nine (9) different registers may be selected with
different piece weight factors.

Front Panel Data Entry
Select the desired function from the examples given below. Then press
the buttons in the order shown from left to right. The following
symbols are used to indicate numeric button entry which may be
comprised of multiple numeric entries.
The dotted line symbol indicates that numeric entry at this point in the
se uence is not re uired unless the data are to be changed.
FUNCTION 0: TEST all display segments.
FUNCTION 1: PRESET entry of weight values. Two speed feed
enabled.
Preset
0Preset 1 Preset 2 Preset 3
FUNCTION 1: PRESET entry of weight values. Single speed feed
enabled.
Preset
0Preset 1 Preset 2-5
Preset
6

FUNCTION 2: DRIBBLE entry of weight values.
Dribble
1
Dribble
2
Dribble
3
FUNCTION 3: PRE CT entry of weight values. Two speed feed
enabled.
Preact
1Preact 2 Preact 3
FUNCTION 3: PRE CT entry of weight values. Single speed feed
enabled.
Preact
1
Preact
2-5
Preact
6
FUNCTION 4: T/D Time and Date Entry - 12 Hour Mode.
Date Time AM-
PM

FUNCTION 4: T/D Time and Date Entry - 24 Hour Mode.
Date Time
FUNCTION 5: SUBTOT L Subtotal viewing or printing of selected
register.
or
Reg # Prints
Subtotal
Exits.
No
Printing
FUNCTION 6: TOT L Total viewing or printing of selected register.
lso selects the current register.
or
Reg # Prints
Total
Exits.
No
Printing
FUNCTION 7: ID Numeric ID entry of up to seven digits.
ID

FUNCTION 8: CONSECUTIVE NUMBERING CN viewing or
changing.
CN
FUNCTION 9: PIECE WEIGHT Weight per Piece Entry and Piece
Mode Selection. Note: Selecting Register 0 will disable the piece
counting mode and return the display to the weight mode.
Pc Wt
Reg # Pc Wt
REC LL T RE: Keyboard Tare Entry of Known Tare Value.
Tare
Weight
REC LL T RE: Keyboard Tare Entry (Ten Tare Look -up)
Tare
Reg
Tare
Weight

How to Enter and Exit System Setup
Locate the small dip switch block in the lower right corner of the mother board. Turn on
S1, the display should then show FSE F1.
From the FSE Fn display you may scroll forwards and backwards using the [TARE] and
[ZERO] buttons. When the page you want is displayed, press [PRINT] to accept and view
the first step in that page.
Example: If the setup switch S1 is turned on, the display will show FSE F1. Press
[ZERO] button. The display will show FSE F6, press [PRINT], display will show F6.0 n.
You may now change the current setting for F6.0 by pressing [TARE], accept the setting
by pressing [PRINT], or backup to F5.9 by pressing [ZERO].
You may also go directly to the page you wish to change by pressing the page number
minus 1 on the keypad, after S1 is turned on. (Example: Operate S1. Display shows FSE
F1. Press 3. Display shows FSE F4.)
Upon completion of your changes you may exit and save without having to go all the way
to the end of the setup steps by pressing the [F1] button (on most units this will be an
unlabeled button under [RECALL/TARE], second down from the top, on the right hand
side). The display will go to FCd0. Press [PRINT] to save changes or press [TARE] to
change option to 1 or 2. Option 1 will discard all changes you have made (you can also
do this by turning off S1 at any time before the display shows FILEd. Option 2 (not
available on earlier software) is used to reset the factory defaults into the EEPROM
where all of the setup data is stored (U14 under the A/D board.).
Once you have selected which FCd option to use (usually 0 which is how it comes up
automatically) save your selection by pressing [PRINT] after about a second the display
should read FILEd, at this time you may turn off the setup switch S1 and return to the
weighing mode.
Function Se ect Enab e Descriptions:
F1 Contains settings that control the overall operation of the scale, such as averaging,
update rate, motion detection, zero tracking, etc.
F2 Tare functions, setpoint options & powerup options are set here.
F3 Serial port parameters, enabling of print fields, and custom formatting.
F4 Serial data output formats, modes.
F5 Enables individual right hand keyboard functions.

F6 Calibration, capacity and increment size selection.
F7 Only available on custom systems.
Configuration Setting Descriptions
F1.0 Raw Counts Display
Enable Raw counts mode is used for diagnostic purposes and is also useful for
precalculating calibration settings. Once enabled, it will display the internal counts from
the A/D (analog/digital) converter which should fall between 250-100,000 counts on
standard software. If your display is showing top or bottom dashes it is already out of
range and raw counts will show the same indication. Check your wiring and millivolt
output from the load cell(s). This is the only configuration setting that does not have to be
written to permanent memory to take effect, just push [TARE] to set it to E, press
[PRINT] to accept the setting and turn off S1. The display will show all of the
annunciator arrows to show that it is in raw counts mode. To disable raw counts and
return to normal weighing, either repeat the above procedure setting to d, or simply
remove power. When you power the system back up raw counts mode will be disabled.
F1.1 Digital veraging
Used to increase the stability of the weight readings. Higher settings will make the
display more stable in a noisy environment (wind, vibration, etc.), but will slow down the
display response. Lower settings will speed up the response but may cause excessive
motion and jitter in the display.
F1.2 Display Update Rate
This setting controls how often new readings are sent to the display. Higher settings will
make the display more responsive and give more of a scrolling number effect. Lower
settings will cause readings to appear to change all at once and may mask some
instabilities.
F1.3 Motion Detection
This controls how much the readings have to change to cause motion to be detected.
Motion detection is used to prevent printing, taring and zeroing of the scale when the
weight is unstable.
F1.4 uto Zero Tracking Enable
F1.5 uto Zero Tracking Width

Used to control the automatic ZEROING of the scale. It will automatically track small
drifts in weight such as caused by small amounts of debris, rain, or thermal drift.
Tracking width sets how much drift can be automatically zeroed out. Example, if you
have a truck scale with 20 lb increments and your tracking width is set to 3, anything that
weighs 60 lb or less will be zeroed out. This may not be desirable if you are using your
system for filling/batching and have a very slow fill rate or if you are trying to weigh
very small items (which is not recommended) as the tracking may happen faster than you
are filling and will cause it to appear that the scale is not working.
F1.6 - 2% Zero Range
Will prevent the scale from being Zeroed if the reading is more than 2% of the capacity
set in F6. Useful to prevent accidental re-zeroing and subse uent restarting of batch
systems when a batch is already being processed.
F1.7 Right Hand Keyboard Enable
Turns on/off the right hand side of the keyboard. Has no effect on the four (4) function
buttons under the display.
F1.8 Output Options
Controls the function of the J4 connector on the mother board. Should be disabled if not
used as it will slow down the system.
F1.9 High Resolution Mode
Allows you to bypass the normal four (4) raw counts per digit re uirement that would
limit you to about 24,000 display units. You should not use this unless necessary as
neither the internal circuitry of the A/D board nor the load cells connected to it were
designed for such extremes.
F2.0 Tare Enable
Controls whether or not the front panel [TARE] button will operate. The tare function
should be used to remove an empty container weight without having to zero the scale.
When the [TARE] button is pushed the scale will enter the tare weight automatically and
switch to the net mode. You can switch between the gross mode and net mode using the
[GROSS/NET] button.
F2.1 Tare Interlock
Prevents the tare from being cleared if the scale is not at zero. Used mostly to prevent the
accidental clearing of the tare value while it is still in use.

F2.2 uto Clear Tare
Causes the tare value to be cleared automatically when the scale returns to zero. Use this
to force entry of a new tare weight for each container being used (such as in a recycle
center application, where you have multiple bins).
F2.3 Ten Tare Look -up
Enables the storage of up to ten (10) tare values. You can use this to store the tare values
for several containers and retrieve them by register number as needed.
F2.4 Battery Back-up Enable
Prevents values in the random access memory from being cleared by a power-up
se uence. This consists of ID numbers, Consecutive Numbers, tare values, preset,
dribble,preact,totals, etc. Revision D and higher mother boards have a 24-hour back-
up circuit built-in. This can be extended to approximately ten (10) years on all mother
boards with an addition of a time/date module.
F2.5 Stand-by Mode on Power-up
Will cause the display annunciator arrows to light upon power-up. The display will be
disabled until either the [ZERO] or [TARE] buttons are pressed. Re uired by Weights
and Measures in some areas to show that a power failure has occurred.
F2.6 External Gross/Net Enable
When enabled the front panel [GROSS/NET] button will not operate. The system will
instead take an input (contact closure) from TB1-3 of the mother board. Unlike the front
panel switch this input is closed for net and open for gross.
F2.7 Two-Speed Feed
Part of the preset function, enables the [DRIBBLE] button on the front panel. The value
in the dribble will be subtracted from the preset, and used to operate the two speed relay
function. If enabled there are three (3) presets, disabled there are six (6).
F2.8 Sequential Feed
Controls how the output relays (connected to J7) operate during two-speed feed
operation. When disabled, both the slow and fast feed relays are energized initially. The
fast feed relay is de-energized when the weight reaches the preset minus the dribble
value. The slow feed relay is de-energized when the preset weight minus the preact is
reached.