USER`S MANUAL - Minarik Drives
Contents
1. 1 min 250 Hz min rev 60 sec Application Examples 31 The accumulated count is given by the following formula count rate time f time AEM time Solving this equation for time yields the following equation count 10 000 250 40 seconds time See Figure 14 for diagrams of the switch settings for this example There is no time base for mode 2 2 a una DS501 al Figure 14 Mode 2 Totalizer Mode Example DIP Switch Settings 32 Application Examples Mode 3 time in process mode Application 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 Calculate the required time base to display the time necessary in seconds for the components to travel the length of the belt MAGNETIC PICKUP LEADS Solution It is known that time in process DDN is 50 seconds when the motor speed is 1000 RPM From the equation on page 20 we have 250 000 60 250000 60 _ DDN RPM X PPR 50 1000 X 60 gt Sec See Figure 15 for diagrams of the switch settings for this example Application Examples 33 Q eut DS501 TENTHS ere SECONDS SECONDS SECONDS y Suis _ 3 P Jd ds a SW502 SW503 SW504 Figure 15 Mode 32. 60 RPM PPR 1 30 0 654 sec 0 65 second rounded 28 Application Examples rounded value original value error S X 100 original value 0 65 0 6545 2 06545 X 100 The new display range is t _ 0 327ft sec Min speed 30 RPM 30 RPM X IRPM 9 818 feet second or about 10 foot per second 0 327ft sec Max speed 1800RPM 1800 RPM X RPM 589 05 feet second or about 589 feet per second The display will now range from about 0010 to 0589 feet per second reducing the error by a factor of 10 By placing DIP switch DP4 to ON the display will read 001 0 to 058 9 The error due to rounding could be decreased by further increasing the DDN by a factor of 10 again and moving the decimal point 01 00 to 58 90 See Figure 13 for a diagram of the switch settings for this example Application Examples 29 DS501 us MUNDREDTHS SECONDS a o SECONDS y NU a d XA A IP SW502 SW503 SW504 Figure 13 Mode 1 Example Two Switch Settings 30 Application Examples Mode 2 totalizer mode Application A VTS 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 L1 L2 Solution Calculate the output frequency as follows _ rev pulses 1 min min rev 60 sec f 500 X 30
3. 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 The tachometer mode displays the monitored shaft speed or a multiple of it The display can be frozen to the last reading by shorting terminal COM to terminal H Mode 2 Totalizer mode Mode 2 is the totalizer mode DIP switches 7 OFF and 8 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 The display can be reset to zero by shorting terminal COM to terminal H Mode 3 Time in process monitor mode Mode 3 is the time in process monitor mode DIP switches 7 ON and 8 OFF This mode displays the time in process or a linear multiple of it in seconds The display in the time in process monitor mode is inversely proportional to the monitored shaft speed Programming 17 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 The display can be frozen to the last reading by shorting terminal COM to terminal H c um MODE 2 TOTALIZER MODE MODE 3 TIM
4. thermal protection and enclosure Follow sound maintenance procedures A Warning Circuit potentials are at 115 VAC or 230 VAC above earth ground Avoid direct contact with the printed circuit board or with circuit elements to prevent the risk of serious injury or fatality Contents Specifications Dimensions General Information Installation General installation information Screw terminal bloCK lt a Mounting Linus nada tri e ol coca ae dala drole 28 Mieten oa ind ud praia d Shielding guideliie8 ous reseca WY aane a Connections ee o id er bet eee LN sanies ata ala AC Line voltage select switch Programming DIP switches 5522 5c Ge tints Io beans we ad CA ROY ol Encoder power supply DIP switch 1 Feedback select DIP switches 2 and 3 Decimal point selection DIP switches 4 5 and 6 Mode selection DIP switches 7 and 8 Rotary DIP switches 41 5 eru uu eese Y ce exorta ke A ao e Mica c Time base calculations Application Examples Mode 1 tachometer mode example 1 Mode 2 totalizer mode Mode 3 time in process mode Mode 4 time in process mode min sec or hour min format Unconditional War
5. Example DIP Switch Settings 34 Application Examples Mode 4 time in process mode min sec or hour min format Application 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 Assume that it takes 3 minutes and 15 seconds to complete the process when the motor speed is 1000 RPM Calculate the required time base for this application MAGNETIC PICKUP LEADS Solution Using the equation on page 20 we have 250 000 60 t 60X Y RPM X PPR 250 000 60 t K606 15 11000 PPR 7 1 28 seconds See Figure 16 for a diagram of the switch settings for this example Application Examples 35 9 ruth DS501 TENTHS HUNDREDTHS SECONDS SECONDS SECONDS y S a E y Be Y PA Qo Sy SW502 SW503 SW504 Figure 16 Mode 4 Example DIP Switch Settings Notes 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 This warranty shall not apply to any product that h
6. input power applied Doing so may cause fire or serious injury Make sure you have read and understood the Safety Warnings on pg i before attempting 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 Mount the VT8 away from other heat sources Operate within the specified ambient operating temperature range The operating temperature range for the VT8 is 10 C through 40 C Prevent loose connections by avoiding excessive vibration of the VTS 6 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 Insert stripped wire into the wire clamp Turn the terminal block screw clockwise to clamp the wire Figure 2 Screw Terminal Block Installation 7 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 bracke
7. E IN PROCESS MONITOR MODE MODE 4 TIME IN PROCESS MONITOR MODE WITH TIME DISPLAY Figure 10 Operating Mode Select DIP Switches 18 Programming Rotary DIP switches 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 Settings of all zeros is equal to a time base of 10 00 seconds An explanation of the time base calculation begins on page 19 The time base is programmed for modes 1 3 and 4 only SW502 SW503 SW504 ryn fit i F1 1 Figure 11 VT8 Rotary DIP Switches Programming 19 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 To program the rotary switches use a small screwdriver and set the pointer mark to the desired number The following application variables must be known before calculating the time base t DDN The desired display number DDN is the known display value at a certain shaft speed RPM It should be 4 digits and ignore any decimal point
8. USER S MANUAL ModelV T8 VISI TACH M ulti Functional Digitallndicator Automation mari amp Control Copyright O 2000 by Minarik Corporation 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 technical 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 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 Printed in the United States of America Safety Warnings This symbol A 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 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 Reduce the chance of an electrical fire shock or explosion by proper grounding over current protection
9. as been repaired by unauthorized persons The Corporation is not responsible for removal installation or any other incidental expenses incurred in shipping the product to and from the repair point B Disclaimer The provisions of Paragraph A are the Corporation s sole obligation and exclude all other warranties of merchantability for use express or implied The Corporation further disclaims any responsibility whatsoever to the customer or to any other person for injury to the person or damage or loss of property of value caused by any product that has been subject to misuse negligence or accident or misapplied or modified by unauthorized persons or improperly installed C Limitations of Liability In the event of any claim for breach of any of the Corporation s obligations whether express or implied and particularly of any other claim or breech of warranty contained in Paragraph A or of any other warranties express or implied or claim of liability that might despite Paragraph B be decided against the Corporation by lawful authority the Corporation shall under no circumstances be liable for any consequential damages losses or expense arising in connection with the use of or inability to use the Corporation s product for any purpose whatsoever An adjustment made under warranty does not void the warranty nor does it imply an extension of the original 12 month warranty period Products serviced and or parts replaced on a no charg
10. e basis during the warranty period carry the unexpired portion of the original warranty only If for any reason any of the foregoing provisions shall be ineffective the Corporation s liability for damages arising out of its manufacture or sale of equipment or use thereof whether such liability is based on warranty contract negligence strict liability in tort or otherwise shall not in any event exceed the full purchase price of such equipment Any action against the Corporation based upon any liability or obligation arising hereunder or under any law applicable to the sale of equipment or the use thereof must be commenced within one year after the cause of such action arises Automation inari amp Control 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 O Printed in the U S A 2 00 North America 10 00 Outside North America 11 00
11. 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 1RPM minute rev 2 n r 1min 1 foot CREM minute minute 60 sec 12 inches 1 rev 2 3 14 3 75 1min 1 foot TRA minute A minute 60 sec 12 inches 0327 feet per second Now calculate the time base using the equation on page 16 te DDN 60 032760 _ 06545 sec RPM PPR 1 30 Rounded the result is 0 07 second Solution to part b Calculate the error as follows rounded value original value X 100 original value error 0 07 0 06545_ y 100 6 95 0 06545 error Application Examples 27 Solution to 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 Min speed 230 RPM 30 RPM X 1 RPM 0 98175 feet second or about 1 foot per second Max speed 1800 RPM 1800 RPM x 0 0327 ft sec_ 1 RPM 58 905 feet second or about 59 feet per second This means the display will range from about 0001 to 0059 feet per second Solution to part d 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 The new time base is calculated as follows DDN 60 327
12. gnetic 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 Solution Using the equation on page 18 with arbitrary values of RPM 100 and DDN 100 the time base becomes DDN 60 100 60 t RPM PPR 10030 7 seconds This is the standard time base that the factory sets into the VTS for shipment See Figure 12 for a diagram of the switch settings for this example 24 Application Examples Q eut DS501 TENTHS HUNDRED1THS SECONDS SECONDS SECONDS p gt Ss y e u 3 Qo Jd DE A SW502 SW503 SW504 Figure 12 Mode 1 Example One Switch Settings Application Examples 25 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 VT8 display the speed of a belt which is mounted on the pulley in feet per second Find a The required time base b The error due to rounding the time base c The display range in feet per second if the motor speed ranges from 60 to 1800 RPM d A method for lowering the error PK21 PULLEY RADIUS 3 75 IN gt L1L2 BELT 058 98 Minarik 26 Application Examples Solution to part a Start by obtaining a conversion
13. ming Switches 12 Programming 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 1088888 t DS501 Figure 6 VT8 DIP Switches Programming 13 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 5 VDC ENCODER VOLTAGE 12 VDC ENCODER VOLTAGE Figure 7 Encoder Power Supply DIP Switch 14 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 Programming 15 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 DECIMAL DISPLAY 00 00 DECIMAL DISPLAY 0 000 DECIMAL DISPLAY 0000 Figure 9 Decimal Point Location Select DIP Switches 16 Programming Mode selection DIP switches 7 and 8
14. present RPM Revolutions per minute of the monitored shaft at the time when the DDN is known PPR Pulses per revolution of the pickup encoder or transducer This is the number of teeth on the pickup wheel or lines on the optical encoder 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 t The RPM and DDN in the above equation are arbitrary values Any RPM value may be chosen The desired display number for the RPM selected is then determined by the user s application Mode 2 totalizer mode Mode 2 has no time base Mode 3 time in process monitor mode To calculate the time base in mode 3 use the equation below z 250 000 X 60 t DDN RPM ppr Programming 21 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 Calculate the time base with the following equation using the DDN calculated with the equation above _ 250 000 X 60 t DDN RPM ppr 23 Application Examples Mode 1 tachometer mode example 1 Application A PK1 ma
15. r 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 LL LN Figure 3 Connection Diagram 10 Installation Line voltage select switch SW501 ATTENTION Change voltage switch settings only when the VTS 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 The VT8 is equipped with line voltage select switch SW501 Figure 4 Set this switch to 115 if using a 115 VAC line voltage input Set the switch to 230 if using a 230 VAC line voltage input K D6 115 230 05011 Figure 4 Line Voltage Select Switch SW501 11 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 VTS before it is set in the panel For access to the programming switches remove the two screws holding the rear cover to the case and remove the cover The switches are illustrated in Figure 5 SW502 SW503 SW504 riera rim rity of ar tratar D9 D11 D13 D15 D17 D19 Figure 5 VT8 Program
16. ranty iv Illustrations Figure 1 DIMENSIONS o tered Ried RYD BP BA SORE ARPES FA OS 2 Figure 2 Screw Terminal Block 6 Figure 3 Connection Diagram 9 Figure 4 Line Voltage Select Switch SW501 10 Figure 5 VT8 Programming Switches 11 Figure 6 VT8 DIP Switches cio eme nn hate ERR a 12 Figure 7 Encoder Power Supply DIP Switch 13 Figure 8 Feedback Select DIP Switches 14 Figure 9 Decimal Point Location Select DIP Switches 15 Figure 10 Operating Mode Select DIP Switches 17 Figure 11 VT8 Rotary DIP Switches 18 Figure 12 Mode 1 Example One Switch Settings 24 Figure 13 Mode 1 Example Two Switch Settings 29 Figure 14 Mode 2 Totalizer Mode Example DIP Switch Settings 31 Figure 15 Mode 3 Example DIP Switch Settings 33 Figure 16 Mode 4 Example DIP Switch Settings 35 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 Sou
17. rce 20 Operating Temperature Range 10 C 40 C Maximum Input Rate 20 kHz Feedback Frequency Range 10 20000 Hz LED Readout Size 0 7 inches 2 Dimensions Figure 1 Model VT8 Multi Functional Digital Indicator Dimensions General Information Minarik Corporation s VISI TACH model VT8 provides a means for monitoring the speed of rotating shafts using a digital velocity transducer Speed transducers such as magnetic pickup optical encoders or hall effect sensors convert motor speed into a small signal frequency which is supplied to the 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 in process monitor with a display of an inverse frequency or a time in process monitor with a time format in hours and minutes or minutes and seconds The unit is programmable using a series of switches located under the rear panel access cover The variables programmed using these switches are the power supply 5 or 12 VDC the type of feedback magnetic pickup or optical encoder decimal point location and the mode the unit will operate in The rotary switches program the time base in seconds Detailed explanations of each one of these items follow in the programming section of this manual page 11 Installation Warning Do not install rewire or remove this control with
18. t by engaging the two hooks on each bracket into the two slots on each side of the unit with the threaded end of the screws towards the back of the panel 4 Screw the two mounting bracket screws in until they bite into the rear of the panel The screws should be tight enough to prevent the VISI TACH from moving but do NOT over tighten the screws or you may damage your panel 8 Installation Shielding guidelines Under no circumstances should power and logic leads be bundled together Induced voltage can cause unpredictable behavior any electronic device including motor controls As a general rule Minarik recommends shielding of all conductors Tf it is not practical to shield power conductors Minarik recommends shielding all logic level leads If shielding is not practical the user should twist all logic leads with themselves to minimize induced noise 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 VTS ground the shield at the end away from the VT8 Do not ground both ends of the shield If the VT8 continues to pick up noise after grounding the shield it may be necessary to add AC line filtering devices or to mount the VT8 in a less noisy environment Installation 9 Connections 1 Connect the AC power line input on terminals L1 and L2 This voltage may be eithe
Download Pdf Manuals
Related Search