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Minarik VT8 User Manual

Visi-tach multi-functional digital indicator
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USER'S MANUAL
Model VT8
VISI-TACH® Multi-Functional
Digital Indicator

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Summary of Contents for Minarik VT8

  • Page 1 USER’S MANUAL Model VT8 VISI-TACH® Multi-Functional Digital Indicator...
  • Page 2 Corporation and its Divisions make no warranty of any kind with respect to this material, including, but not limited to, the implied warranties of its merchantability and fitness for a given purpose. Minarik Corporation and its Divisions assume no responsibility for any errors that may appear in this manual and make no commitment to update or keep current the information in this manual.
  • Page 3 Safety Warnings • This symbol denotes an important safety tip or warning. Please read these instructions carefully before performing any of the procedures contained in this manual. • DO NOT INSTALL, REMOVE, OR REWIRE THIS EQUIPMENT WITH POWER APPLIED. Have a qualified electrical technician install, adjust and service this equipment.

  • Page 5: Table Of Contents

    Contents Specifications Dimensions General Information Installation General installation information ........5 Screw terminal block .
  • Page 6 VT8 DIP Switches ........12...

  • Page 7: Specifications

    Specifications Selectable AC Line Voltage (via switch SW501) 115 VAC +/- 10%, 50/60 Hz, 5.5 Watts 230 VAC +/- 10%, 50/60 Hz, 5.5 Watts Selectable Power Supply Output (selected via switch SW502) 5 VDC @ 50 mA 50 mA, Regulated Source, +/- 4% 12 VDC @ 25 mA 25 mA, Unregulated Source, +/- 20% Operating Temperature Range...

  • Page 8: Dimensions

    Dimensions Figure 1. Model VT8 Multi-Functional Digital Indicator Dimensions...

  • Page 9: General Information

    VT8. The VT8 is a multi-functional device and can be programmed for use as a tachometer for display of revolutions per minute, feet per minute, etc. It can also be used as a totalizer, a time-...

  • Page 11: Installation

    General installation information The VT8 components are sensitive to electrostatic fields. Avoid contact with the circuit board directly. Protect the VT8 from dirt and moisture. Provide adequate clearance for wiring and programming. This takes place at the back of the unit.

  • Page 12: Screw Terminal Block

    Installation Screw terminal block Connections to Minarik’s VT8 digital indicator are made to a screw terminal block. The screw terminal block has a similar connection style to the one shown below. Using a screwdriver, turn the terminal block screw counter- clockwise to open the wire clamp.

  • Page 13: Mounting

    Installation Mounting 1. Cut a rectangular opening 1-25/32 inches [45mm] high by 3-3/8 inches [86mm] wide in your panel. 2. Unscrew the two mounting bracket screws until the threaded end is almost flush with the threaded bushing. ® 3. Place the VISI-TACH through the panel opening and install the mounting bracket by engaging the two hooks on each bracket into the two slots on each side of the unit, with...

  • Page 14: Shielding Guidelines

    It may be necessary to earth ground the shielded cable. If noise is produced by devices other than the VT8, ground the shield at the VT8 end. If noise is generated by a device on the VT8, ground the shield at the end away from the VT8. Do not ground both ends of the shield.

  • Page 15: Connections

    Installation Connections 1. Connect the AC power line input on terminals L1 and L2. This voltage may be either 115 or 230 VAC. 2. Connect the pickup, encoder or transducer on the terminals as indicated in the drawing below. IMPORTANT: To prevent possible interference do NOT run pickup, encoder, or transducer cable in same conduit as the AC line.

  • Page 16: Ac Line Voltage Select Switch

    Line voltage select switch (SW501) ATTENTION: Change voltage switch settings only when the VT8 is disconnected from AC line voltage. Make sure the switch is set to its correct position before applying power. If the switch is improperly set to a lower voltage position, the transformer may be damaged.

  • Page 17: Programming

    Programming The VT8 may be programmed before installing it into the panel, and before connecting to the AC line and the pickup, encoder or transducer, or after the entire system is set up. For easier handling, it is usually more convenient to program the VT8 before it is set in the panel.

  • Page 18: Dip Switches

    To change the position of the DIP switches use a small screwdriver to push each DIP switch to the desired position. The DIP switch block has a similar construction style to one shown below (Figure 11). Figure 6. VT8 DIP Switches...

  • Page 19: Encoder Power Supply (Dip Switch #1)

    Programming Encoder power supply (DIP switch #1) DIP switch 1 determines the VT8 power supply output to an external encoder. Set DIP switch to OFF for +5 VDC or ON for +12 VDC to power an optical encoder. For accuracy and current output of this power supply see the specifications on page 1.

  • Page 20: Feedback Select (Dip Switches 2 And 3)

    Programming Feedback select (DIP switches 2 and 3) DIP switches 2 and 3 are dependent upon which type of feedback has been selected. See the table below for the settings. OPTICAL ENCODER FEEDBACK MAGNETIC PICKUP FEEDBACK Figure 8. Feedback Select DIP Switches...

  • Page 21: Decimal Point Selection (Dip Switches 4, 5 And 6)

    Programming Decimal point selection (DIP switches 4, 5 and 6) DIP switches 4, 5 and 6 determine where the decimal point will light in the display. See the table below for the settings. Only one switch may be on at any time. DECIMAL DISPLAY 000.0...

  • Page 22: Mode Selection (Dip Switches 7 And 8)

    Programming Mode selection (DIP switches 7 and 8) To select the mode in which the VT8 will operate, use DIP switches 7 and 8. Mode 1 (Tachometer mode) Mode 1 is the tachometer mode (DIP switches 7 and 8 OFF).

  • Page 23: Rotary Dip Switches

    Programming Mode 4 (Time in process monitor mode with time display) Mode 4 is the time-in-process monitor mode (min:sec or hour:min format) (DIP switches 7 and 8 to ON). In this mode the unit displays the number in time format. This display can be used to read minutes and seconds, or hours and minutes.

  • Page 24: Time Base Calculations

    The programming variable which determines the display reading is called the time base. The time base is the time interval the VT8 uses to count the pulses from the speed transducer and issue the result to the display. The rotary DIP switches program the time base, in seconds, from 0.01 seconds to 10.00 seconds.
  • Page 25 Programming Time base calculations Ideally, the time base should be set between .67 seconds and 2 seconds. If the time base is set below .67 seconds, the display will update too often and tend to flicker. If the time base is set greater than two seconds, the display reading will not update often enough and may lag the actual speed of the application.
  • Page 26 Programming Mode 1 (tachometer mode) The time base (t) is a variable which scales the RPM of the monitored shaft at the location of the speed transducer. (DDN)(60) (RPM)(PPR) The RPM and DDN in the above equation are arbitrary values. Any RPM value may be chosen.
  • Page 27 Programming Mode 4 (time in process monitor mode (min:sec/hour:min format)) In this mode we must convert the DDN to an hours and minutes (or minutes and seconds) format. This is done with the following equation: DDN = 60X + Y where X = hours and Y = minutes when operating in the hours and minutes mode, and X = minutes and Y = seconds when operating in the minutes and seconds mode.

  • Page 29: Application Examples

    Mode 1 (tachometer mode) - example 1 Application A PK1 magnetic pick up (PPR=30) is mounted on a motor and is connected to a VT8. The VT8 will display the speed of the motor directly. Calculate the required time base. MOTOR...

  • Page 30: Figure 12. Mode 1 Example One Switch Settings

    Application Examples Figure 12. Mode 1 Example One Switch Settings...
  • Page 31 1800 RPM. The pulley on the motor has a radius of 3.75 inches. The user wishes to have the VT8 display the speed of a belt, which is mounted on the pulley, in feet per second.
  • Page 32 Application Examples Solution to part a) Start by obtaining a conversion factor between motor speed in RPM to belt speed in feet per second. Use an arbitrary speed of 1 RPM for the calculation. 1 revolution 1 RPM = minute 1 foot 2(π)(r) 1min...
  • Page 33 The error due to rounding may be decreased by increasing the display value by a factor of 10 and introducing a decimal point. To do this set DIP switch DP4 to ON. The VT8 will read a speed of 10 feet per second as 10.0 feet per second.
  • Page 34 Application Examples rounded value - original value X 100 % error = original value 0.65 – 0.6545 X 100 0.6545 The new display range is: 0.327ft/sec (30 RPM) X Min speed = 30 RPM 1 RPM = 9.818 feet/second or about 10 foot per second. 0.327ft/sec (1800 RPM) X Max speed = 1800RPM...

  • Page 35: Figure 13. Mode 1 Example Two Switch Settings

    Application Examples Figure 13. Mode 1 Example Two Switch Settings...

  • Page 36: Mode 2 (Totalizer Mode)

    Application Examples Mode 2 (totalizer mode) Application A VT8 is set for the totalizer mode with a PK21-30 (30 lines per revolution) encoder. The application speed is 500 RPM. Calculate the output frequency of the PK21-30 and the length of time that the display will count before rolling over.

  • Page 37: Figure 14. Mode 2 Totalizer Mode Example Dip Switch Settings

    Application Examples The accumulated count is given by the following formula: (RPM)(PPR) (time) count = (rate)(time) = (f)(time) Solving this equation for time yields the following equation: (10,000) (count) time = = 40 seconds (250) See Figure 14 for diagrams of the switch settings for this example.

  • Page 38: Mode 3 (Time In Process Mode)

    A motor, and a variable speed drive are powering a conveyor belt carrying components. A 60 tooth magnetic pick up, mounted to the motor shaft, sends a signal to the VT8. It takes 50 seconds for a component to travel the length of the belt when the motor speed is 1000 RPM.

  • Page 39: Figure 15. Mode 3 Example Dip Switch Settings

    Application Examples Figure 15. Mode 3 Example DIP Switch Settings...

  • Page 40: Mode 4 Time In Process Mode (Min:sec Or Hour:min Format)

    A motor and a variable speed drive are powering a process conveyor. A 60-tooth magnetic pickup is mounted on the back of the motor and sends a signal to the VT8. The VT8 will display the time taken in minutes and seconds for the process to complete.

  • Page 41: Figure 16. Mode 4 Example Dip Switch Settings

    Application Examples Figure 16. Mode 4 Example DIP Switch Settings...
  • Page 42 Notes...

  • Page 43: Unconditional Warranty

    Unconditional Warranty A. Warranty Minarik Corporation (referred to as “the Corporation”) warrants that its products will be free from defects in workmanship and material for twelve (12) months from date of manufacture thereof. Within this warranty period, the Corporation will repair or replace such products that are returned to Minarik Corporation, 901 East Thompson Avenue, Glendale, CA 91201-2011 USA.
  • Page 44 901 East Thompson Avenue Glendale, California 91201-2011 Tel.: 1-800-MINARIK (646-2745) Fax: 1-800-394-6334 www.minarikcorp.com Document number 250–0293, Revision 0 Printed in the U.S.A – 2/00 North America $10.00, Outside North America $11.00...

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