Readout Parameter Access Code An access code must be entered before machine-related parameters can be set or changed. This prevents inadvertent adjustments to the installation related (machine) setup parameters. IMPORTANT The access code is 8891 Refer to the Setup section. Begin by pressing the S key. When "Setup" is displayed, press the 8, 8, 9, 1, and E keys. The readout is now ready for machine parameter setting operations.
Hassle-Free Warranty ACU-R RITE readouts and precision glass scales are warranted to the end user against defects in material and workmanship and against any damage that occurs to the product within three (3) years from the original purchase date. ACU-R RITE will, at its discretion and expense, repair or replace the returned item RITE receives notice of the or any of the item's component(s) as long as ACU-R defect or damage within the three (3) year warranty period.
TABLE OF CONTENTS DRO 200E Introduction ..................................................................................................................1 A Tour of the Readout..........................................................................................................................1 Front and Back Views ....................................................................................................................1 Keypad................................................................
TABLE OF CONTENTS DRO 200E Sleep.........................................................................................................................................23 Language..........................................................................................................................................23 Installation...............................................................................................................................24 Selecting a Location............................
INTRODUCTION DRO 200E Introduction ACU-RITE readouts provide application-specific features allowing you to obtain the most productivity from your manual machine tools. This readout is designed specifically for EDM applications. Specific features include a special EDM display, retract relays, and dwell capabilities. A Tour of the Readout Front and Back Views Axis keys Zero keys Indicators EDM MM INCR ABS ZERO SET C/L X ZERO ABS INCR C Y ZERO ENABLE ZERO SETUP 7 8 9 4 5 6 1 2 3 .
INTRODUCTION DRO 200E Keypad Selects absolute or incremental display ABS INCR Used to locate centerlines C English /metric conversion Enter all numeric values with these Use to begin a preset X ZERO MM 7 8 9 4 5 6 1 2 3 . 0 +/- CLEAR Y ZERO RETRACT Z DISPLAY ZERO ENABLE DWELL Switches display between DRO and EDM views. Program retract and dwell functions. 2 SETUP Use Clear key to erase digits that you entered by mistake, and to take you back to a previous parameter.
INTRODUCTION DRO 200E Displays At the top of the display window is a row of indicators. These tell you the current state of the readout. EDM MM INCR ABS ZERO SET C/L ZERO SET C/L Appears when setting an absolute zero. Appears when you are setting a preset or an absolute zero. Tells you when the centerline function is active. EDM MM Appears when EDM view is displaying cut depth information. Appears when the display is in metric, dark when the display is in inches.
INTRODUCTION DRO 200E Power-On Position Recovery Position-Trac™ Current ACU-RITE precision glass scales, including the ENC 150, contain distanceencrypted reference marks allowing you to quickly recall absolute zero (datum) after a power interruption. When power is restored, the readout will scroll a message indicating power has been lost, and will prompt you to move each axis until a reference mark is located.
READOUT OPERATIONS DRO 200E Readout Operations DRO View This section describes the readout’s functions when it is in the DRO view. This includes a description of absolute and incremental displays, the various methods of setting absolute zero (datum) and presetting absolute and incremental distances. Absolute Display Shows the distance from your current position to absolute zero (datum). The electrode is positioned at 1.625 ABS. Absolute Zero, also called datum or Workpiece Zero 1.
READOUT OPERATIONS DRO 200E Zeroing the Displays Absolute Zero (Datum) On many prints, dimensions are measured from a datum. By setting the readout’s absolute display to zero at a well-chosen edge, you can position the ram based on dimensions directly from the print. 1.25 Absolute Zero (Datum) Setting Absolute Zero (Datum) at the Current Position 0.72 1.44 2.44 1. Move to desired location. 2. Make sure that the absolute indicator (ABS) is lit. key if it is not. Press the A 3.
READOUT OPERATIONS DRO 200E Setting Absolute Zero (Datum) with a Tool 1. Touch the tool to the edge of the workpiece. .25 Inch Tool 2. Make sure that the absolute indicator (ABS) is lit. Press the 3. Press the A key if it is not. -.125 z key for the appropriate axis. The readout will display these indicators: ABS ZERO SET 4. Enter the position of the tool center and press E.
READOUT OPERATIONS DRO 200E Incremental Zero From the incremental display (INCR), press the z key next to the appropriate axis. This sets the display to zero at the current tool position. Presetting Absolute The absolute preset is based on datum. When an absolute preset is entered, the readout calculates the incremental distance to the preset position. In the example below, the current position is 1.0000” and the desired position is 1.5000” as measured from datum.
READOUT OPERATIONS DRO 200E Absolute and Incremental Presets To maintain the best tolerance and to minimize the chance of errors, use • absolute presets for absolute dimensions. • incremental presets for incremental dimensions. The following examples, shows how to make the identical part using absolute presetting or incremental presetting. Absolute Example: 1. Verify the readout is in ABS mode. If not press 2. Press, in order, then E. A. X key, then type in ., 7, 2, .72 3. Repeat for dimensions 1.
READOUT OPERATIONS DRO 200E Center-line Presets You can set a preset at the center of a workpiece, or in the center of a hole. To preset incremental zero on a centerline: First Point Second Point 1. Press the axis key you wish to find center with. Second Point 2. Press the centerline L key. The SET C/L indicator will be lit. First Point 3. A message will ask you to “ENTER FIRST EDGE”. 4. Move to first edge and press the E key. 5. A message will ask you to “ENTER SECOND EDGE.
READOUT OPERATIONS DRO 200E EDM View This readout provides a very flexible dwell and retract capability which can be configured to a wide variety of EDM control schemes. Your particular EDM machine may not have the ability to use all of these features described in this section. EDM Display D To help you monitor the progress of a cut, press the key. The EDM indicator will light up. All three displays show you something about the Z-axis.
READOUT OPERATIONS DRO 200E Setting Absolute Zero (Datum) at Current Position 1. In either DRO or EDM view, verify the readout is in ABS mode. If not press A. 2. Position the ram to the point where 1st spark will occur. 3. Press the Position Ram Here, then set Z-zero (Datum) Spark Gap Work Piece z key next to the Z key twice. Setting Absolute Zero (Datum) Using a Preset Presetting absolute zero (datum) allows the operator to establish absolute zero at a point other than the current position.
READOUT OPERATIONS DRO 200E Zeroing the Z-axis Using the Spark Detector If you set zero using the optional ACU-RITE spark detector, you can easily compensate for spark gap and electrode erosion from one cut to the next. 1. Preset the depth of the cut (explained on page 11). A. 2. Verify the readout is in ABS mode. If not press z key next to the Z key once. 3. Press the Z-zero (Datum) set when first spark occurs Work Piece The Z-AXIS display will look like this; “_ _ _ _ _ _ _ 0”. 4. Start the cut.
READOUT OPERATIONS DRO 200E R DIST R DIST, or Retract Distance, allows you to establish an incremental distance above the cut depth where the Retract relay will relax, stopping retraction movement. When used, the Retract relay will activate when the cut depth is reached and after any dwell cycle has completed. Retract ends when the current Z position equals RDIST or Z-TOP whichever occurs first. To establish a retract distance: 1. Press the e key then the X key. The display will read “R DIST”. 2.
READOUT OPERATIONS DRO 200E R FAULT R FAULT, or Retract Fault, stops a cut in the event that the ram drifts above a pre-set range from the lowest progress depth. When the R FAULT distance is reached the retract relay is actuated for 1/10th of a second to halt the cutting cycle. To establish an R FAULT point: e key then the X key three times. The display will read 1. Press the “R FAULT”. 2. Press the Y key to toggle between the R FAULT function “OFF” or to begin entering a distance. 3.
READOUT OPERATIONS DRO 200E Dwell The two DWELL parameters tell the EDM control to hold at the cut depth to obtain a better finish or to allow an orbiter to operate. Press the key to view or change the parameters. d Timed Dwell The D-TIME, or Dwell Time parameter causes the ram to hold a cut depth for the number of minutes that you enter. To enter or change the dwell time use the keypad to enter the minutes you would like the EDM to dwell. The time is displayed in minutes and fractions of minutes (i. e.
SETUP DRO 200E Setup The S key lets you access the many readout configuration parameters. Some of these parameters are “job related”, meaning that they may change from job to job. Others are “machine related” and are only set when the readout is installed or maintained. Press the S key to access these parameters. Use the X key to move from one parameter to the next. After the last parameter, the X key ends the setup process and saves any changes. Use the C key to return to a previous parameter.
SETUP DRO 200E Near Zero Warning When used with presets, Near Zero Warning allows you to establish a distance from zero where the display will indicate you are nearing the end of your cut (zero). When the established point is reached while approaching zero, the digit(s) to the left of the decimal will flash. The range is, in effect, on both the positive and negative side of zero. When zero is reached the flashing digits stop.
SETUP DRO 200E Linear Error Compensation This readout includes a linear error compensation (LEC) feature that enables you to compensate for machine tool inaccuracies by using a simple measuring standard. You can have up to three different compensation segments per axis. For linear error compensation to be effective, the error must repeat. If the error is different each time it is measured, check and adjust the machine ways and lead screws. Also check scale mounting bracketry.
SETUP DRO 200E 1. Move to the first side of the standard and press E. ENTER 2. When prompted, move to the second side of the standard and press E. ENTER 3. When prompted, use the keypad to enter the actual length of the standard and press E. “X LEC 1” and the “LEC” value are displayed. 8.1250 Opposite sides 8.0000 Same side You can press the Y key to repeat this process for the same segment to verify if the error is repeatable. 4.
SETUP DRO 200E “Machine Related” Setup Parameters Machine related setup parameters are generally set during installation or when maintenance is performed. These parameters affect the readout performance in dramatic ways and are protected by an access code to prevent accidental modifications. The machine related parameters can be accessed by pressing S, entering the 4-digit access code and then pressing E. The access code number is given on a tear-out sheet on the first page of this manual.
SETUP DRO 200E To automatically detect the scale resolution: • Move the X-axis scale in a positive direction until the displayed resolution blanks continue moving axis until a resolution value appears in the Y-axis display field. Scale Resolution settings for each additional axis will follow and are set in the same manner. • Press the X key to continue or, press the exit setup.
SETUP DRO 200E Sleep In order to prolong the life of the vacuum fluorescent display the readout will go to “sleep” after being idle for approximately 30 minutes. When the display is sleeping, a dot will scroll along the X-axis indicating that the readout is still active. To wake the readout, either press any key, or move any axis. The display will instantly return to normal. If you wish to prevent your display from going to sleep, press the Y key until “0” is displayed.
INSTALLATION DRO 200E Installation IMPORTANT Before installing the readout, record the serial number on the warranty card and return it to ACU-RITE INCORPORATED. The serial number label is located on the back of the readout. Selecting a Location Selecting a location for the readout is an important consideration for proper installation.
INSTALLATION DRO 200E Checking Voltage and Connecting Power CAUTION Connecting the readout to a power source outside of the acceptable range, or making an inappropriate setting with the voltage selector, may damage the readout, the scales, or both. Check that the voltage available at the power source is within specification before connecting it to the readout. If required, set the voltage selector to match the line voltage. 1.
INSTALLATION DRO 200E Connecting the Output Relays The readout has three output relays: • The Retract relay indicates to the control that the ram has reached the target depth. The operator can define how far the ram will retract from the target depth. The ram can be raised to a pre-determined position or a preset distance from the target depth. The characteristics of your particular control and work piece setup will determine how the operator should set the Retract relay.
INSTALLATION DRO 200E Relay Timing Diagrams The readout's e key lets the operator: • turn all EDM functions “ON” and “OFF”. • change the distance (R-DIST) that the retract relay is de-energized, or • enter a Z-Top position. When a Z-Top position has been entered, the Retract relay will energize at the preset retract depth, and will stay energized until the ram reaches the Z-Top position. The relay will relax if the RAM stops before the Z-Top position is reached.
INSTALLATION DRO 200E Retract After Dwell Spark Spark Retract Relay Relaxed Dwell Relay Relaxed Position Hold Relay Electrode is de-energized* No Spark Active Retract begins when dwell time expires plus a short delay of 100 ms. Retract ends when Z = R-DIST or Z-TOP which ever occurs first. Active Active Dwell time begins when cut depth is reached. Dwell Time Ram Position Monitoring Begins Active when ram is at or below target depth. Relaxed Ram position is monitored until retract. Fig.
INSTALLATION DRO 200E Retract After Sparkout The spark timer is reset with each spark. Spark Retract Relay Dwell Relay Position Hold Relay Sparkout time expires Spark Electrode is de-energized* No Spark Spark timer begins when cut depth is reached. Active Relaxed Retract begins when Spark out time expires plus a short delay of 100 ms. Retract ends when Z = R-DIST or Z-TOP which ever occurs first. Active Relaxed Active Relaxed Dwell time begins when cut depth is reached.
READOUT SPECIFICATIONS DRO 200E Readout Specifications Characteristic Specification Operating conditions 0° to 40°C (32° to 104°F) Storage conditions 25% to 85% relative humidity (non-condensing) -40° to 60°C (-40° to 140°F) 25% to 95% relative humidity (non-condensing) Input requirements Voltage: Frequency: Current: 115VAC or 230VAC (+/-20%), single phase 47-63 Hz 300ma @115V, 150ma @230V Fuse 115V operation: ½ A, 250V, 3AG, Slo-blo 230V operation: ¼ A, 250V, 3AG, Slo-blo Scale input Position s
TROUBLESHOOTING DRO 200E Troubleshooting This section is intended to provide you with some basic troubleshooting assistance with your readout system. If you cannot correct the problem after following these instructions, contact your authorized ACU-RITE distributor for repair or replacement procedures. No Operation NOTICE If you turn power off, you must wait at least 5 seconds before turning it back on, or the readout may not power up.
TROUBLESHOOTING DRO 200E Incorrect Operation If system positioning does not seem to be repeatable, the problem could be with the machine tool or with the readout system. • Check linear scales. Check each scale and reading head for proper installation. Ensure that the mounting brackets are secure. Verify repeatability of the reading head. If the system seems to be displaying incorrect positions, check the following items. • • • • Verify presets. Make sure the numbers you enter are correct. Verify tool.
TROUBLESHOOTING DRO 200E To run the diagnostics: • Press and hold the “V1.2.0”). • Press the . key until the software version is displayed (i.e. X key to continue. Key Pad Test As a key is held a “+” is displayed on the left side of the X-axis. When the key is released the “+” will disappear. A count of the number of keys pressed will be displayed on the right side of the X-axis. • Press any key, but • Press the X and observe the “+” to verify proper functioning. X key to continue.
TROUBLESHOOTING DRO 200E Resetting Factory Defaults In some cases, it may be advantageous to reset the readout factory default settings. Doing this will cause all parameters to revert to the state they were in when the readout left the factory. Once accomplished, it may be necessary to re-establish certain parameters as needed for proper EDM functions. To reset factory default settings: 1. Turn power off to the readout, wait 5 seconds and turn power on. 2.
TROUBLESHOOTING DRO 200E • If the problem remains in the same display, the readout is in error. • If the problem follows the connection change, the linear scale may be in error. Refer to the Checking the Linear Scales section of your scale reference manual. Display overflow errors are indicated by dashes in all digits in an axis display. A numeric overflow occurs when the intended measurement is too large for the eightdigit display.
