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Minarik VT7 Series User Manual

Visi-tach multi-functional digital indicator
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USER'S MANUAL
Model VT7
VISI-TACH® Multi-Functional
Digital Indicator

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Summary of Contents for Minarik VT7 Series

  • Page 1 USER’S MANUAL Model VT7 VISI-TACH® Multi-Functional Digital Indicator...
  • Page 2 All rights reserved. No part of this manual may be reproduced or transmitted in any form without written permission from Minarik Corporation. The information and tech- nical data in this manual are subject to change without notice. Minarik Corporation and its Divisions make no warranty of any kind with respect to this material, includ- ing, but not limited to, the implied warranties of its merchantability and fitness for a given purpose.
  • Page 3 Safety Warnings • This symbol denotes an important safety tip or warning. Please read these sections carefully prior to performing any of the instructions contained in that section. • Have a qualified electrical maintenance technician install, adjust, and service this equipment. Follow the National Electrical Code and all other applicable electrical and safety codes, including the provisions of the Occupational Safety and Health Act (OSHA) when installing equipment.

  • Page 5: Table Of Contents

    Contents Specifications Dimensions General Information Installation General installation information ........4 Screw terminal block .
  • Page 7 Specifications AC Line Voltage VT7-115 115 VAC +/- 10%, 50/60 Hertz, 5.5 Watts VT7-230 230 VAC +/- 10%, 50/60 Hertz, 5.5 Watts Programmable Power Supply Output 5 VDC @ 50 mA 50 mA, Regulated Source, +/- 4% 12 VDC @ 25 mA 25 mA, Unregulated Source, +/- 20% Operating Temperature Range 10°C–40°C...
  • Page 8 Dimensions Figure 1. Model VT7-115 and Model VT7-230 Multi-Functional Digital Indicator Dimensions...
  • Page 9 General Information ® Minarik Corporation’s VISI-TACH models VT7-115 and VT7-230 provide a means for monitoring the speed of rotat- ing shafts using a digital velocity transducer. Speed transduc- ers such as magnetic pickup, optical encoders or hall effect sensors convert motor speed into a small signal frequency which is supplied to the VT7.

  • Page 10: Installation

    Installation General installation information The VT7 components are sensitive to electrostatic fields. Avoid contact with the circuit board directly. Protect the VT7 from dirt and moisture. Provide adequate clearance for wiring and programming. This takes place at the back of the unit. Mount the VT7 away from other heat sources.

  • Page 11: Screw Terminal Block

    Installation Screw terminal block Connections to Minarik’s VT7 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 12: Mounting

    6 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 thread- ed end is almost flush with the threaded bushing. ® 3.

  • Page 13: Shielded Cable

    Installation Shielded cable Use shielded cable when logic lines are longer than 18 inches (475 mm). Logic lines of this length act as an antenna and can pick up noise from other devices or other ground wires, or voltage from power lines that can cause erratic operation. Attach the shield to the COM terminal on the back of the VT7 or the pickup source only.

  • Page 14: Connections

    Installation Connections 1. Connect the AC power line input on terminals L1 and L2. This voltage is 115 VAC for the VT7-115 and 230 VAC for the VT7-230. 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 15: Programming

    Programming The VT7 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 VT7 before it is set in the panel.

  • Page 16: Slide Switch

    Programming Slide switch The position of the slide switch deter- mines the power supply output. Set the slide switch to +5 or +12VDC to power an optical encoder. For accura- cy and current output of this Fig. 5. VT7 Power power supply see the specifica- Supply Slide Switch tions on page 1.
  • Page 17 Programming Feedback type. DIP switches 1 and 2 are dependent upon which type of feedback has been selected. See the table below for the settings. Feedback Type Switch #1 Switch #2 Magnetic pickup Optical encoder Decimal point selection. DIP switches 3, 4 and 5 determine where the decimal point will light in the display.

  • Page 18: Rotary Dip Switches - Time Base Calculations

    Programming Mode 2 is the totalizer mode (set 6 OFF and 7 ON). In this mode the unit displays continuous count of pulses received from the speed transducer. The display will turn over to 0000 after either 10,000 pulses have been received from the speed transducer or the unit has been reset.
  • Page 19 Programming Fig. 7. VT7 Rotary DIP Switches 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 20 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 val- ues.

  • Page 21: Application Examples

    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 VT7. The VT7 will display the speed of the motor directly. Calculate the required time base.
  • Page 22 Application Examples Switch settings - tachometer mode - example one Fig. 8. Tachometer Mode-Example One DIP Switch Settings Fig. 9. Tachometer Mode Example One Rotary DIP Switch Settings...

  • Page 23: Mode 1 Tachometer Mode - Example 2

    Application Examples Mode 1 tachometer mode - example 2 Application. A PK21-30 encoder (30 lines per revolution) is monitoring the speed of a motor with a maximum of 1800 RPM. The pulley on the motor has a radius of 3.75 inches. The user wishes to have the VT7 display the speed of a belt, which is mounted on the pulley, in feet per second.
  • Page 24 Application Examples 1 revolution 1 RPM = minute 2(π)(r) 1 rev 1min 1 foot 1 RPM = minute 60 sec. 12 inches minute 1 foot 2(3.14)(3.75) 1min 1 rev 1 RPM = minute 60 sec. 12 inches minute = .0327 feet per second Use the equation on page 14 to calculate the time base: (.0327)(60) (DDN)(60)
  • Page 25 Application Examples Solution-part c. To determine the display range calculate the minimum(min) and maximum(max) speed in feet per second: 1 RPM = 0.0327 ft./sec. 0.0327 ft./sec. (30 RPM) Min speed = 30 RPM 1 RPM = 0.98175 feet/second or about 1 foot per second. 0.0327 ft./sec.
  • Page 26 Application Examples rounded value - original value % error = original value 0.65 – 0.6545 = .69% 0.6545 The new display range is: 0.327 ft./sec. (30 RPM) X Min speed = 30 RPM 1RPM = 9.818 feet/second or about 10 foot per second. 0.327 ft./sec.
  • Page 27 Application Examples Switch settings - tachometer mode - example two Fig. 10. Tachometer Mode-Example Two DIP Switch Settings Fig. 11. Tachometer Mode Example Two Rotary DIP Switch Settings...

  • Page 28: Mode 2 Totalizer Mode

    Application Examples Mode 2 totalizer mode Application. A VT7 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 29 Application Examples Switch settings - totalizer mode example Fig. 12. Totalizer Mode Example DIP Switch Settings...

  • Page 30: Mode 3 Rate Monitor Mode

    Application Examples Mode 3 rate monitor mode Application. A motor, and a variable speed drive are power- ing a conveyor belt carrying components. A 60 tooth magnetic pick up, mounted to the motor shaft, sends a signal to the VT7. It takes 50 seconds for a component to travel the length of the belt when the motor speed is 1000 RPM.
  • Page 31 Application Examples Switch settings - rate monitor mode example Fig. 13. Mode 3 Example DIP Switch Settings Fig. 14. Mode 3 Example Rotary DIP Switch Settings...

  • Page 32: Mode 4 Rate Monitor Mode (Min-Sec Format)

    26 Application Examples Mode 4 rate monitor mode (min:sec or hour:min format) Application. A motor and a variable speed drive are power- ing a process conveyor. A 60 tooth magnetic pickup is mount- ed on the back of the motor and sends a signal to the VT7. The VT7 will display the time taken in minutes and seconds for the process to complete.
  • Page 33 Application Examples Switch settings - rate monitor mode (min:sec or hour:min format) example Fig. 15. Mode 4 Example DIP Switch Settings Fig. 16. Mode 4 Example Rotary DIP Switch Settings...
  • Page 35 Limited Warranty A. Warranty - Minarik Corporation (referred to as “the Corporation”) warrants that its prod- ucts will be free from defects in workmanship and material for two (2) years from date of shipment thereof, or 6,000 hours, whichever comes first. Within this warranty period, the Corporation will repair or replace such products that are: (1) returned to Minarik Corporation, 901 East Thompson Avenue, Glendale, CA 91201-2011 USA;...
  • Page 36 901 East Thompson Avenue Glendale, California 91201-2011 Phone: (818) 502-1528 Fax: (818) 502-0716 www.minarikcorp.com Document number 250–0257, Revision 1 Printed in the U.S.A – 5/98 North America $10.00, Outside North America $11.00...

This manual is also suitable for:

Vt7-115Vt7-230Vt6 seriesVt6-230Vt6-115

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