MAHA VZM 300 Original Operating Instructions
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MAHA VZM 300 Original Operating Instructions

Decelerometer
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Decelerometer
VZM 300
Original Operating Instructions
English
D1 2010BA0-GB03

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Summary of Contents for MAHA VZM 300

  • Page 1 Decelerometer VZM 300 Original Operating Instructions English D1 2010BA0-GB03...
  • Page 2 All rights reserved in cases of patent granting or registration of design. The contents of this version have been checked with great care. However, errors cannot be fully excluded. Please contact MAHA should you find errors of any kind. Subject to technical change without notice.

  • Page 3: Table Of Contents

    VZM 300 ONTENTS Description ......................1.1 Intended Use..........................1.1 Specifications..........................1.2 1.2.1 Data Processing ......................1.2 1.2.2 Printer .......................... 1.3 1.2.3 Interfaces........................1.3 Standard Delivery ........................1.3 Accessories..........................1.4 Safety ........................2.1 Introduction ..........................2.1 Safety Regulations........................2.1 Attention ............................2.1 Additional Information .........................
  • Page 4 VZM 300 Setting Menu......................6.1 Set Clock............................. 6.2 6.1.1 Check Date and Time....................6.2 6.1.2 Set Time only....................... 6.2 6.1.3 Set Date only ....................... 6.2 Program Variables ........................6.3 Program Selector Switches ......................6.3 Program Customer Address ....................... 6.4 Program Name of Tester ......................6.4 Set Contrast ..........................

  • Page 5: Description

    According to Guideline 71/320/EEC (last changed by Guideline 98/12/EC) the effectiveness of brake systems is determined by the measurement of the average brake deceleration. The VZM 300 calculates the average brake deceleration in accordance with ISO/DTR 13487F (see equation page 3.14) and thus meets the requirements of the Guideline 71/320/EC.

  • Page 6: Specifications

    VZM 300 Description Specifications 1.2.1 Data Processing Display range 0…22 m/s Recommended test speed 20...40 km/h min. Accuracy 0.1 m/s Inclination speed max. 40 degrees/s Measuring range Automatic scaling (1/2/3/5/10/20/30/50) 7 x 1000 measuring points Memory 14 x 500 measuring points...

  • Page 7: Printer

    Description VZM 300 1.2.2 Printer 24-digit, 8 needles, 144 dots/line Character set 5 x 7 (5 x 9) dots per character Speed approx. 0.45 s/line at 25 °C Woodfree, width 57.5 mm, Paper copy paper can be used Ribbon cartridge ERC-09 or ERC-22 1.2.3...

  • Page 8: Accessories

    VZM 300 Description Accessories ‹ Description Part PRINTCOM Paper Roll, Plain 520163 PRINTCOM Paper Roll, with Copy 520645 PRINTCOM Ribbon Cartridge 520165 RS232 Interface Cable incl. PC Data Communication Program with Completion 911018 Certificate for Standard Spreadsheets Power Supply Cable for Cigarette Lighter 12/24V...

  • Page 9: Safety

    VZM 300 Safety Introduction Thoroughly read the operation manual before commissioning the VZM 300 and comply with the instructions. Always display the manual in a conspicuous location. Personal injury and property damage incurred due to non-compliance with these instructions are not covered by the product liability regulations.

  • Page 10: Additional Information

    Safety Additional Information Š The VZM 300 is suitable for a temperature range from 0…50 °C. Ambient temperatures outside this range may result in measurement distortions. Š Periodically charge and discharge the battery. If the decelerometer is not in use for an extended period, the battery could be destroyed.

  • Page 11: Operation

    If the deceleration test is to be conducted with a pedal force meter or a pressure sensor, connect the device to the 9-pin connector on the left-hand side of the VZM 300. To support the battery connect the on-board cable from the cigarette lighter to the 8-pin connector on the left-hand side of the VZM 300.

  • Page 12: Keypad

    VZM 300 Operation Keypad Description Start menu item / Confirm entries Correct / Delete entries Go forward one menu item Go back one menu item Cancel / Quit – Start Setting Menu (only possible in the Main Menu) – Activate / Deactivate Shift function (capital / small letters) –...

  • Page 13: Main Menu

    Operation VZM 300 Main Menu Press any key to switch on the decelerometer.  ;88 The software version number appears. 8g:8N9HI 11"/601120 The battery capacity appears. A>F Now the Main Menu items appear on the display. The VZM300 swiches off automatically after 5 minutes if no operations have been carried out within this period.

  • Page 14: Start Measurement

    VZM 300 Operation Start Measurement 3.4.1 Conduction of a Deceleration Measurement 1. In the Main Menu select menu item ”Start Measurement”. 1/1*"02/"*gMR 2. Press <ENTER> to start the deceleration test. 1/14)1%QJR 3. Position the decelerometer horizontally for the offset balance.
  • Page 15 Operation VZM 300 The higher the test speed, the longer the required test distance. A suitable test site must be available. 6. Now the following print options appear: No printout (1), printout of values (2), or printout of values and graphics (3). Select desired option using respective key. For a detailed description see section 3.7 "Print measurement".

  • Page 16: Store Measurement

    VZM 300 Operation Store Measurement The VZM 300 offers storage of either – 7 values with 1000 measuring points each or – 14 values with 500 measuring points each. Default setting is storage with 7 data memories. The setting can be changed in the Setting Menu under menu item Selector Switch.

  • Page 17: Show Measurement

    Operation VZM 300 Show Measurement ‹ After the data memory has been entered, the maximum values and the brake deceleration according to ISO requirements can be visualized on the display. %,4*"02/"*gMR 1. In the Main Menu select "Show measurement" and 1/14)1%QJR confirm with <*>.

  • Page 18: Print Measurement

    VZM 300 Operation Print Measurement ‹ After the data memory has been entered, the printout mode can be selected. /)+1*"02/"*gMR 1. In the Main Menu select "Print Measurement" and 1/14)1%QJR confirm with <*>. +1"/*"*,/6+,g ‹ 2. Enter the data memory and confirm with <*>.

  • Page 19: Delete Measurement

    Operation VZM 300 Delete Measurement If the test values are needed for further processing, transfer the data to a PC and store them before deleting the test. If a new vehicle is to be tested, select menu item "Delete Measurement" to clear all memories, vehicle data, comments, maximum values and brake deceleration values.
  • Page 20 VZM 300 Operation Example for a truck with the following data: – Tractor weight : 7 t – Trailer weight : 5 t 1 Conduct the brake deceleration test as described. 2 Print out the graphical representation. 3 Select start and end point according to the printout.

  • Page 21: Calculation Of The Arithmetic Average

    Operation VZM 300 3.9.1 Calculation of the Arithmetic Average In this menu item the arithmetic average of all measured values will be calculated for a specific time interval that has to be entered. From this arithmetic average of the brake deceleration the average speed, the average braking distance and the duration of the braking process will be calculated.
  • Page 22 VZM 300 Operation Arithmetic Average ∑ − : arithmetic average of brake deceleration : brake deceleration at time i : start point of interval for calculation of average value : end point of interval for calculation of average value The other average values (pedal force, tractive force, pressure 1, pressure 2 and pressure 3) will be calculated according to this equation.

  • Page 23: Trailer Deceleration

    Operation VZM 300 3.9.2 Trailer Deceleration Deactivate the tractor brake during the measurement. ")$%11/ 1,/ 1. Enter the tractor weight. ")$%11/)("/ 2. Enter the trailer weight. The trailer deceleration will be calculated (ISO) and printed out from the following values: maximum brake force, arithmetic average (if available), and brake deceleration.
  • Page 24 ∆ − × ∆ ISOab: : deceleration according to ISO by averaging of two acceleration values (issued as ISOab on the VZM 300) : acceleration at time t /2) – t : acceleration at time t /2) + t start...

  • Page 25: Enter Comments, Vehicle Data And Name Of Tester

    Operation VZM 300 3.10 Enter Comments, Vehicle Data and Name of Tester Comments, vehicle data and the name of the tester must be entered after the first measure- ment, provided that the respective selector switches are activated (see 6.3 "Programming Selector Switches").

  • Page 26: Enter Vehicle Data

    VZM 300 Operation 3.10.2 Enter Vehicle Data Here the vehicle data can be entered, provided the respective selector switch is in the appropriate position. 24 characters/digits are available in each line. +1"//"$)01g+,g 7. Enter the vehicle data and confirm with <ENTER> to continue.

  • Page 27: Trigger Menu

    VZM 300 Trigger Menu To conduct a measurement the VZM 300 requires a start and end signal (trigger start/stop). These start/stop signals are actuated once a measurement exceeds or falls below a preset value (e.g. trigger threshold of the brake deceleration > 1 m/s The trigger start/stop signals can be released by various control elements.

  • Page 28: Selection Of Sensors

    3. Position the decelerometer horizontally for the offset balance. ,0)1g%,/)7,+1(g 4. Start the offset balance using <ENTER>. 8g88RQ QJR Be sure no sensor connected to the VZM 300 is subject to pressure or force during the offset balance. ("0"4)1ggg ##0"1(+ " (g 2/8g88*N0b 5.

  • Page 29: Start Deceleration Measurement / Activate Triggers

    Trigger Menu VZM 300 Start Deceleration Measurement / Activate Triggers The automatic START trigger threshold will be prompted on the display. /)$g" "(gHKI Select using <0> or <1>. Use <ENTER> to take over the setting and continue with Q9R Q8RMR the measurement.

  • Page 30: Manual Start Of Measurement

    VZM 300 Trigger Menu Manual Start of Measurement Prevents a premature start of the measurement when low trigger thresholds are used. If manual start by hand trigger /<*> is set in the selector switches, the message "Begin measurement with <*>/<HANDTR>" appears on the display after the start of the measurement and the offset balance.

  • Page 31: Measurement With Tractive Force Sensor

    The chain or strap used must be suitable for the vehicle weight. 1. Attach the tractive force sensor between towing and towed vehicle by using a suitable chain or strap. 2. Connect the sensor to the VZM 300. 3. Switch on the decelerometer. 1/1*"02/"*gMR 4.
  • Page 32 VZM 300 Trigger Menu 11. If a new measurement is to be conducted, press <ESC> and repeat procedure from step 4. Í Î 12. Use < > or < > to page through the menu items. Use <ENTER> to select a menu item:...

  • Page 33: Measurement With Pressure Sensor

    Make sure the pressure sensor cable does not become entangled in rotating or movable parts of the vehicle. 1. Attach the pressure sensor to the desired connection point. 2. Connect the sensor to the VZM 300. 3. Switch on the decelerometer. 1/1*"02/"*gMR 4.
  • Page 34 VZM 300 Trigger Menu 11. If a new measurement is to be conducted, press <ESC> and repeat procedure from step 4. Í Î 12. Use < > or < > to page through the menu items. Use <ENTER> to select a menu item:...

  • Page 35: Pc Data Transmission

    COM4 VZM300 COM4 Data transmission is realized via a 3-wire cable available from MAHA or by means of the integrated IrDA interface on the left-hand side of the decelerometer. To activate the data transmission via the optical interface, the PC or laptop with the IrDA interface must be positioned in such a way that there is visual communication between the IrDAS of the PC and the VZM300.

  • Page 36: Data Transmission

    VZM 300 PC Data Transmission Data Transmission The VZM300 must be switched on during the data transmission. 1 Start the "VZM300.EXE" program. The Main Menu appears on the monitor. 2 Select menu item "Receive Data" and confirm with RETURN. Data transmission is now complete.

  • Page 37: Setting Menu

    VZM 300 Setting Menu In the Main Menu press <F1> to start the Setting Menu. "1(, 'MR Set/check time and date. 1/14)1%QJR /,$g/)("0MR Change variable values. 1/14)1%QJR "(" 1,/4)1 %"0MR Set selector switches. 1/14)1%QJR /,$g!!/"00MR Enter customer address. 1/14)1%QJR /,$g"01"/MR Enter tester name.

  • Page 38: Set Clock

    VZM 300 Setting Menu Set Clock In the Main Menu press <F1> to start the Setting Menu. Í Î Select menu item "Set Clock" using < > or < >. "1(, 'MR 1. Press <ENTER> to start the menu item.

  • Page 39: Program Variables

    Setting Menu VZM 300 Program Variables In the Main Menu press <F1> to start the Setting Menu. Í Î Select menu item "Program Variables" using < > or < >. /,$g/)("0MR 1. Press <ENTER> to start the program. 1/14)1%QJR /)$g" "(gHKI 2.

  • Page 40: Program Customer Address

    VZM 300 Setting Menu Program Customer Address If the customer address is to appear on the printout the selector switch "Print Customer Address" must be activated. In the Main Menu press <F1> to start the Setting Menu. Í Î Select menu item "Program Address" using <...

  • Page 41: Set Contrast

    Setting Menu VZM 300 Set Contrast In the Main Menu press <F1> to start the Setting Menu. Í Î Select menu item "Set Contrast" using < > < >. "1,+1/01MR 1. Press <ENTER> to start the program. 1/14)1%QJR MQS,'QJRSRK Í...
  • Page 42 VZM 300 Setting Menu D1 2010BA0-GB03...

  • Page 43: Check Deceleration / Sensors

    VZM 300 Check Deceleration / Sensors Check Deceleration This program can be used to check the measuring accuracy (± 0,1 m/s ) of the acceleration sensor. 1. In the Main Menu press <F1> to start the Setting Menu. Í Î...
  • Page 44 VZM 300 Check Deceleration / Sensors 6. 90° Inclination Press <ENTER> once again. The target value for 90° inclination appears. A _PAg@9QJR Check the deceleration value in vertical position. " "(gAg@=*N0b If <ENTER> is pressed again, the offset balance is restarted at horizontal position.

  • Page 45: Check External Sensors

    8g88RQ QJR ("0"4)1ggg ##0"1(+ " Be sure no sensor connected to the VZM 300 is subject to pressure or force during the offset balance. At completion of the offset balance apply the test weight or test pressure and compare the displayed values.
  • Page 46 VZM 300 Check Deceleration / Sensors D1 2010BA0-GB03...

  • Page 47: Maintenance

    ("0"/" %/$" After a charging time of approx. 7 hours the battery is fully charged. If the VZM 300 decelerometer is not in use for an extended period, the battery voltage will drop due to self-discharge. A recharging interval of 6 months is recommended by the battery manufacturer.

  • Page 48: Changing The Paper Roll

    Changing the Ribbon Cartridge To change the ribbon cartridge, open the top cover of the VZM 300. Lightly press right-hand side of ribbon ("Push"), until the cartridge is lifted on the left-hand side. Now the cartridge can be easily removed.

  • Page 49: Annex

    VZM 300 Annex Standard Variables The programming is done in the Setting Menu. ‹ Variable Description Value Unit Trig. Decel. (+) Trigger Threshold: Decel. for autom. test start 0.01 m/s Trig. Decel. (–) TT: Deceleration for autom. test stop 0.01 m/s Trig.
  • Page 50 VZM 300 Annex ‹ Variable Description Value Unit Resolution Meas. Time Graphic resolution, or determination of total 0.01 s meas. time (1…10) Pitch angle compensation is only conducted with a meas. time resolution of 1 and 2. 1 = 100 Hz: 100 values/second 10 s max.

  • Page 51: Standard Selector Switches

    Annex VZM 300 Standard Selector Switches (* Factory Setting) Switch Description ‹ ‹ Input and printout of registration ‹ DFWLYDWHG Enter Registration Input and printout of registration GHDFWLYDWHG Input and printout of manufacturer activated Enter Manufacturer Input and printout of manufacturer deactivated...
  • Page 52 VZM 300 Annex Switch Description ‹ Input of memory after test completion. ‹ Select Memory Autom. memory allocation after test completion until all memories are assigned. Then the display prompts for the memory Horizontal printout of deceleration graphics (NL mode)

  • Page 53: Trigger Selector Switches

    Annex VZM 300 Trigger Selector Switches (* Factory Setting) Description Pressure 2 available? Pressure 2 available Pressure 3 available? Pressure 3 available Trigger Threshold: Deceleration for automatic test start Trig. Decel. (+) TT: Decel. for autom. test stop Trig. Decel. (–) TT: Pedal force for autom.

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