USER`S MANUAL - Minarik Drives
Contents
1. 27 Troubleshooting 29 Before troubleshooting iv 2 4 2022 ee a a par 29 Unconditional Warranty 33 iv Illustrations Figure 1 DLC300 400 Dimensions 3 Figure 2 DIP Switch Location Figure 3 DLC300 400 connections 15 Introduction Minarik Models DLC300 and DLC400 Digi Lok Converters are used with conventional analog speed controls to produce closed loop digital systems capable of controlling motor speed precisely and with excellent reproducibility The Digi Lok Converter DLC receives the feedback signal generated by a sensor that monitors a rotating element driven by the motor The sensor assembly can be a magnetic pickup with ferromagnetic gear or a NPN type optical encoder or inductive proximity switch or a Hall effect sensor with magnetic wheel An important distinction exists between any Digi Lok Converter system and a conventional servo drive The Digi Lok Converter reads a velocity dependent feedback signal and corrects its output to bring the motor back to its set speed The Digi Lok Converter will not compensate for any positioning errors caused by very minor speed fluctuation Industrial applications for Digi Lok Converter control systems include many within the food processing chemical and pharmaceutical industries for example Blending mixing grinding pumping and other such processes often r2. Before troubleshooting Perform the following steps before starting any procedure in this section e Disconnect AC line voltage from the drive e Check the drive closely for damaged components e Check that no conductive or other foreign material has become lodged on the printed circuit board e Verify that every connection is correct and in good condition e Verify that there are no short circuits or grounded connections e Check that the drive s rated armature outputs are consistent with the motor ratings For additional assistance contact your local Minarik distributor or the factory direct at 1 800 MINARIK 646 2745 phone or 1 800 394 6334 fax 30 Troubleshooting Most problems if they do occur will appear at initial start up of the DLC system The more common problems are described below Should your DLC fail to operate as it should after you have taken the suggestions found in this list contact your Minarik salesperson for technical assistance If the motor will not run 1 The output from the DLC to the speed control may not be wired correctly Check the hookup carefully 2 Check the continuity of all output leads from the DLC to the control and from the control to the motor 3 The speed control may be defective Disconnect the DLC from the control Connect the speed adjust potentiometer to the control Check whether the motor runs properly 4 The motor may be defective Test the system w
3. 44 mm high and 3 38 inches 86 mm wide PANEL 3 38 86 CUTOUT AREA BOUNDED BY DASHED LINES Installation 9 Step 2 Slide the DLC3 400 into the panel opening 10 Installation Step 3 Insert the two mounting brackets into each side of the DLC300 400 case Installation 11 Step 4 Secure the DLC300 400 to the panel using the bracket screws Do not overtighten the screws or damage to the enclosure may result 12 Installation DIP Switch Settings The DLC is set at the factory to receive magnetic pickup feedback If your application does not use a magnetic pickup you must reset two board mounted DIP switches located just inside the case and behind the signal input terminals Reset these DIP switches before you connect the DLC unit to AC power If the near end of the DIP switch is down that switch is ON if up that switch is OFF Use a narrow non metallic screwdriver or similar instrument to set the DIP switches For other than magnetic pickup feedback devices set OPTO left DIP switch ON and MAG right DIP switch OFF DIP SWITCH SHOWN SET TO MAG PICKUP DIP SWITCH LOCATION Figure 2 DIP Switch Location Installation 13 Connections Feedback signal Terminals marked IN and COM accept the feedback signal input Connect the signal lead to IN and the common lead to COM The term
4. nor does it imply an extension of the original 12 month warranty period Products serviced and or parts replaced on a no charge 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 Minarik Corporation 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 0112 Revision 3 Printed in the U S A 7 00 12 00 North America 13 00 Outside North America
5. thermal protection and enclosure Follow sound maintenance procedures A It is possible for a drive to run at full speed as a result of a component failure Minarik strongly recommends the installation of a master switch in the main power input of the drive controllng the motor to stop the drive in an emergency 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 Use a non metallic screwdriver for adjusting the calibration trimpots Use approved personal protective equipment and insulated tools if working on this drive with power applied Contents Specifications 1 Dimensions Installation MOUNTING aniisi te i a ds ek Eee 5 WIND a ee e a aal O he 6 Shielding guidelines vennana sm aa amm a a pa ead hea aa 7 Panalinstallabon suts E o e N Er a 8 DIR Switch Settings au as rn a EE a ne 12 Go nnectionsin ars E E Denen 13 Calibrating the speed control 17 Programming Instructions 17 Programming Mode 4 5 4 3 eat ee nk 18 DLC programming parameters 18 Speed Sealing Factor 11 5 41 02 scene enon ia Uri pb A a dd Z 19 Load Response Number 21 Display Scaling Factor 0635 04 indie esos tr TAD uhr 23 Decimal point location 26 Exit the Programming Mode
6. Minarik Corporation 901 East Thompson Avenue Glendale CA 91201 2011 USA This warranty shall not apply to any product that has 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
7. those given in this manual Please contact your Minarik representative for assistance A schematic diagram and the manufacturer s instructions for interfacing the control with an external speed setting signal will probably be required before the correct wiring scheme can be determined Install the Digi Lok Converter in an area that is protected from exposure to dirt or moisture and from accidental contact Provide clearance that permits access for connecting wires Do not mount the device near other heat producing objects nor in an area subject to cold and moisture Ambient temperature within the range of 10 to 40 C must be maintained 6 Installation Wiring A Warning Do not install remove or rewire this equipment with power Y applied Failure to heed this warning may result in fire explosion or serious injury Circuit potentials are at 115 or 230 VAC above ground To prevent the risk of injury or fatality avoid direct contact with the printed circuit board or with circuit elements Do not disconnect any of the motor leads from the motor control unless power is removed Opening any one motor lead may destroy the control Variable speed DC drives manufactured by other companies may require hookup procedures that differ from those given in this manual Contact your local Minarik branch or distributor for assistance A schematic diagram and the manufacturer s instruction for interfacing the drive with an external spe
8. C commands 18 Programming Instructions Programming Mode Programming can be done before the DLC is installed or before it is connected to the speed controller or after the entire system is set up Usually it is more convenient to program the DLC before it is connected to the speed controller because the motor will not then be running Press the front panel push button marked E ENTER at the same time that you power the DLC unit and it will be put into its Programming Mode If the DLC is already powered up you must interrupt power and hold in the ENTER push button while restoring AC power DLC programming parameters Four parameters must be programmed into the Digi Lok Converter Three parameters can be programmed without running the motor The Speed Scaling Factor correlates the digital speed set at the DLC with the desired speed at the feedback shaft The Display Scaling Factor correlates the numerical value displayed by the DLC with the rpm at the feedback shaft The Decimal Point Location Number fixes the position of a decimal point within the DLC display Programming Instructions 19 As the Digi Lok Converter senses any deviation from set speed its output to the speed control will be changed to bring the actual motor speed back to set speed The selected Load Response Number determines the rate at which the DLC output voltage is changed for a given difference between set speed and actual speed The higher the value of
9. SPEC NO INPUT 115 VAC 50 60 HZ 5 5 WATTS e MINARIK ELECTRIC COMPANY GLENDALE CA 91201 G L1 L2 st 2 3 5 IN COM L cs 2 5 z z 2 8 2 3 MAGNETIC 2 Z IZ Z gt 8 3 PICKUP a Li Z le 5 g NON POLARIZED o z u ju fu 8 T a E E F 14 o 8 Li 8 lt L lt O o 2 o 2 Z E Ig IL SIS OPTICAL ENCODER s2 3 SPEED CONTROLLER Figure 3 DLC300 400 connections Programming Instructions Calibrating the speed control A Warning It is very important that the drive attached to the Digi Lok be properly calibrated for its motor with one exception The IR COMP regulation trimpot must be set to zero full CCW Calibrate the motor speed controller for use with the DLC The objective is to optimize the response of the speed control to the DLC signal and to minimize any tendency by the speed control to independently attempt to regulate motor speed Set the control s Maximum Speed trimpot to its maximum setting Set the control s Minimum Speed trimpot to its minimum setting Adjust the speed control to its maximum rate of acceleration and deceleration to obtain its most rapid response to speed setting commands Lower the IR COMP REGULATION setting to its minimum setting The motor control then will be able to respond almost transparently to the DL
10. USER S MANUAL ModelDLC300 DLC400 DIGI LOK P rogrammable Digital Control 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 to 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
11. ack device that you select must produce at least 600 pulses per revolution Conversely if the application were one that required monitoring and controlling a driven shaft at speeds as high as 4000 rpm the feedback device would be limited to one that produced 30 or fewer pulses per revolution The Digi Lok Converter system can control armature shaft speeds within a 30 1 range Under no circumstances can the DLC be expected to control motor speed beyond the speed rating of the motor viii Specifications Line input voltage 50 60 Hz single phase DLC300 115 VAC 10 DLC400 230 VAC 10 Line power 5 5 watts nominally Acceptable feedback sources 5V NPN type encoder 5V NPN type proximity switch Hall effect sensor Electromagnetic pickup device Feedback frequency range 10 2 000 Hz Maximum speed range 30 1 typical Speed control reference voltage maximum 20 VDC Ambient operating temperature 10 C to 40 C Approximate weight 1 bb Dimensions he 3 375 86 21 ka 23 ALL DIMENSIONS IN INCHES MILLIMETERS Figure 1 DLC300 400 Dimensions Installation A Warning Do not install rewire or remove this control with input power applied Doing so may cause fire or serious injury Make sure you have read and understood the Safety Warnings before attempting installation Mounting Motor speed controls manufactured by other companies may require hookup procedures that differ from
12. decimal points There are four available settings Screen setting Decimal point display 0 0 0 0 1800 0 0 0 1 180 0 0 0 0 2 18 00 0 0 0 3 1 800 Use the UP and DOWN push buttons to change the decimal point location number When you ve done this you can stay in the Programming Mode to correct a previous programming error or you can go to the operating mode Press ENTER to stay in the Programming Mode The SSF programming screen will be seen When you are ready to leave the Programming Mode press and hold the ENTER button while you also press the UP push button Try to release both push buttons at the same time 27 Exit the Programming Mode When you exit the Programming Mode all the values you have programmed will be saved to the EEPROM Press and hold the ENTER button while pressing the UP push button Release both push buttons simultaneously You will see the scaled speed displayed if you have properly executed this transition Tf by chance you release the ENTER push button after the UP push button the display may show you the set speed with the left hand digit flashing This means that you are in the speed setting mode To get out of this mode press ENTER until the right hand digit flashes then press ENTER one more time 29 Troubleshooting A Warning Dangerous voltages exist on the drive when it is powered When possible disconnect the drive while troubleshooting High voltages can cause serious or fatal injury
13. ed setting signal may be required before the correct wiring scheme can be determined e Use 16 20 AWG wire for speed adjust potentiometer wiring Use 14 16 AWG wire for AC line L1 L2 and motor Al and A2 wiring Installation Z Shielding guidelines Under no circumstances should power and logic leads be bundled together Induced voltage can cause unpredictable behavior in any electronic device including motor controls As a general rule Minarik recommends the shielding of all conductors If 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 drive ground the shield at the drive end If noise is generated by a device on the drive ground the shield at the end away from the drive Do not ground both ends of the shield If the drive continues to pick up noise after grounding the shield it may be necessary to add AC line filtering devices or to mount the drive in a less noisy environment Logic wires from other input devices such as motion controllers and PLL velocity controllers must be separated from power lines in the same manner as the logic 1 O on this drive 8 Installation Panel installation Step 1 Cut a rectangular hole in the panel 1 73 inches
14. egins to mask speed changes that may occur Try to settle on a gate time that is less than approximately three seconds An acceptable DSF value must lie between 25 and 150 for the gate time to be between 0 5 and 3 seconds A DSF outside this range can be changed to an acceptable one You need only make the appropriate change in any one or more of the variables appearing in Equation 6 Tf the calculated DSF value is too low you can display ten times the speed and move the decimal point one place to the left monitor a slower rotating shaft or select a feedback source having fewer pulses per revolution If your calculated DSF value is too high you can reduce the speed display by one or more orders of magnitude and move the decimal point You might change to larger units of measure e g feet per minute instead of inches per minute You could also monitor a higher speed shaft or use a feedback device having a higher number of pulses per revolution Change the DSF value by pressing the UP push button to increase the displayed value or the DOWN push button to decrease it Each time the pushbutton is pressed the value will change by one unit To accelerate this rate of change simply hold the pushbutton continuously until you approach the desired rate Release the pushbutton to revert to the slower incrementing rate 26 Decimal point location The decimal point location number is shown when the programming display itself contains four
15. em parameters By combining equations 2 and 3 and solving for gate time we arrive at the following equation GT SPEED DISPLAY SHAFT RPM x 60 PPR sec 4 24 Programming Instructions The display scaling factor DSF equals this gate time expressed as the number of ticks of the DLC 50 Hz internal clock Mathematically DSF 50 x GT 5 Combining equations 4 and 5 we arrive at the final equation DSF SPEED DISPLAY SHAFT RPM x 3000 PPR 6 Equation 6 is identical in its form to equation 1 the speed scaling factor equation There is however one important difference between the two scaling factors The numerical value of the speed scaling factor has no effect on the intrinsic performance of the DLC It only scales the numerical entry to the desired motor speed Any calculated value from 1 to 9999 is totally acceptable as the speed scaling factor The display scaling factor on the other hand defines the gate time for the DLC display equation 5 There are practical limitations on the range of acceptable gate times Gate times shorter than approximately 0 5 sec will yield blurred numbers when the pulse count speed varies in consecutive screen updates To avoid an illegible display set the gate time to at least 0 5 sec Programming Instructions 25 As gate times get longer than approximately 3 seconds they will become less than acceptable since the delay between consecutive updates b
16. equire strict repeatability to ensure product uniformity The digital speed setting feature of the Digi Lok Converter and the closed loop design provide that reliability and reproducibility DLC Compatibility The DLC is compatible with positive reference voltage speed controls only controls that drive the motor when the speed adjust pot wiper is at a positive potential relative to the CCW side of the speed adjust pot With few exceptions speed controls currently being manufactured meet this requirement A few older design speed control models including Minarik Models SL31UD4 and SL51UD4 operate with a negative reference voltage Such controls will require use of Model DLC100 instead of the DLC300 Feedback device selection Acceptable feedback frequency at any set speed in an application must lie within the 10 2000 Hz range Feedback frequency is directly proportional to the number of feedback pulses per revolution PPR and to the speed of the shaft RPM that the feedback transducer monitors Since the application requirements determine the shaft speed range they also will determine the range within which the number of feedback pulses per revolution must lie PPRminimum 600 RPMminimum PPRmaximum 120 000 RPMmaximurn vii As an example consider an application in which the feedback source is monitoring a driven shaft and not the motor armature shaft This shaft is to be run at speeds as low as 1 rpm The feedb
17. g Factor The DLC is set at the factory for use with a 60 pulse per revolution feedback device It is set for entering directly the speed of the monitored shaft in rpm By Equation 1 then the correct value for the Speed Scaling Factor under these conditions is 50 Assume that you need to calculate the SSF for an application involving a different set of parameters A 100 line encoder is mounted on a pinch roller shaft Speed is to be set in feet per minute to one decimal place A setting of 180 0 fpm is equivalent to the roller rotating at 120 rpm Substituting into Equation 1 SSF 1800 120 X 3000 100 450 Notice that the first term substituted into the equation is 1800 not 180 0 Always drop the decimal point if there is one when using the speed setting value in this equation Programming Instructions 21 If you already have enabled the Programming Mode the DLC display will show 0050 the factory set SSF value of 50 The number of decimals displayed in Programming Mode tells which parameter is being displayed One decimal point signifies SSF programming Tf the display shows more than a single decimal point you are viewing the wrong programming screen Bring the display back to the one showing just one decimal point Do this by pressing ENTER once twice or three times to scroll to the correct screen Change the SSF value by pressing the UP push button to increment the displayed value or the DOWN push butto
18. inal marked 5 is a 5VDC power supply output available to drive an encoder feedback device Leads from an electromagnetic pickup device have no fixed polarity These leads may be connected to the IN and COM terminals in either order To avoid signal distortion twist the feedback leads For those installations that require leads longer than approx 18 inches use shielded leads with the shield grounded only at the transducer Good installation practice dictates that you run feedback leads Digi Lok output leads and motor leads in separate conduits Digi Lok Converter output Terminals S1 S2 and S3 are the DLC output terminals Connect SI to the terminal normally assigned to the CCW side of the speed pot S2 to the speed pot wiper terminal and S3 to the speed pot CW terminal If the speed control already has a clamping resistor between its wiper and CCW terminals only connect DLC terminals S2 and S3 to the control terminals The motor speed controller must use a positive reference voltage in its speed setting circuit 14 Installation Line voltage connections Positive disconnects in the AC supply to the speed control unit itself must be in place to ensure an emergency shutdown of the entire system Merely disconnecting the DLC unit will not provide adequate safeguard against a runaway condition Connect earth ground to Terminal G Wire AC power to Terminals L1 and L2 Installation 15 DIGI LOK MODEL DLC300
19. ith another motor If the motor will not lock into speed 1 The load response number may be too low if the oscillation is gradual or too high if the oscillation is very rapid 2 The speed control may be incorrectly calibrated Check that the accel decel and IR comp settings are at their minimums Troubleshooting 31 3 The clamping resistor on the DLC may be dragging the output if the control already has its own circuit with a clamping resistor between the wiper and CCW terminals Remove the connection between DLC terminal S1 and the CCW terminal on the speed control 4 Confirm that the pickup sensing tip is directly over the center of the gear teeth and is no farther than 0 010 above the teeth Extensive shaft runout is the most common cause of this type of problem 5 Check continuity and shielding of pickup leads Electrical noise can cause the DLC to attempt corrections that are not justified 6 Rapid shifts in load may be pulling the motor out of its set speed Consider the use of a regenerative drive with the DLC 7 The IR COMP regulation setting on the drive may be above zero Set IR COMP regulation to zero full CCW If motor runs at top speed regardless of the set speed 1 There may be an electromechanical defect in the pickup a break in the pickup leads or in the leads from any sensor Also check the alignment of the pickup over the gear Without accurate feedback information fed to the DLC the s
20. n to decrement it Each time the push button is pressed the SSF value will change by one unit To accelerate this rate of change hold in the push button continuously until you get close to the desired value Release the push button You will be able to make unit increments again with successive presses of the push button Press ENTER once to move from this screen to the Load Response Number screen Load Response Number The load response number appears when the display contains two decimal points Initially the display should read 000 8 the factory set value Thirty one load response numbers are available 0 through 30 Most applications will run quite successfully at the setting of 8 22 Programming Instructions If your application does not run properly as evidenced by failure to lock into speed you first need to check that shock loading is not occurring The DLC system cannot compensate for the perturbations that shock loading creates Tf the speed oscillates rapidly and with wide amplitude about the set point reduce the load response number slightly and evaluate the results Repeat if necessary until the oscillation no longer is present If the motor accelerates too slowly or if it oscillates slowly around its set speed the DLC probably is responding too slowly to the detected variance in speed Its response will be improved by your increasing the Load Response Number In handling highly inertial loads it may be tha
21. t no setting of the Load Response Number satisfactorily resolves the hunting problem Should this be the case the application may require a regenerative type speed controller instead with the Digi Lok Converter Change the Load Response Number by pressing the UP push button to increase the displayed value or the DOWN push button to decrease it Each time the push button is pressed the value will change by one unit To accelerate this rate of change simply hold in the push button continuously until you approach the desired value After releasing the push button you will be able to make unit increments again Programming Instructions 23 The numbers roll over at 30 and at 0 When the correct load response number is displayed you have completed this stage Press ENTER once to move from this screen to the Display Scaling Factor screen Display Scaling Factor The Display Scaling Factor DSF is seen when the DLC programming display contains 3 decimal points A value of 100 for the Display Scaling Factor appears in this display as 01 0 0 It is important to understand how the DLC display operates In its operating mode the DLC display shows the number of feedback pulses counted during a fixed programmable time period the gate time Mathematically SPEED DISPLAY FREQ X GT 2 Where GT gate time sec and FREQ feedback frequency Hz FREQ SHAFT RPM x PPR 60 8 Thus the DLC gate time may be calculated from the syst
22. the Load Response Number the faster the Digi Lok Converter will respond The proper DLC Load Response Number must be selected empirically It is the value that enables the DLC system to respond as rapidly as possible without hunting or rapidly oscillating about its set point Typically there will be a range of load response numbers that gives satisfactory load response so it is not necessary to determine its precise value Any reprogramming from the factory setting is indicated only when and if system response needs to be improved Speed Scaling Factor The DLC can be programmed to accept speed settings in units numerically different from actual shaft rpm e g in feet per minute or gallons per minute Its feedback signal can originate from a device possessing almost any number of pulses per revolution depending only upon the operating speed range This flexibility is made possible through use of the Speed Scaling Factor SSF 20 Programming Instructions The governing equation is SSF SPEED SETTING SHAFT RPM X 3000 PPR 1 Select any speed setting and the corresponding shaft rpm The entire numerical speed setting entry has to be used in this equation Delete the decimal point if present The number of feedback pulses per revolution is known Substitute these values into Equation 1 and calculate SSF Round off this value to the nearest whole number Any value from 1 through 9999 can be accepted as the DLC Speed Scalin
23. ystem cannot be expected to operate correctly 32 Troubleshooting 2 Verify that the speed control board common is coupled to DLC terminal S1 3 The speed control may be defective Replace the DLC with the speed pot and check whether the motor runs properly 4 The OPTO MAG DIP switches may not be set correctly Check to make sure you have correctly calculated and programmed the speed scaling factor SSF and display scaling factor DSF If the motor is running at a fixed difference below set speed 1 There may be a 60 Hz signal riding on the pickup leads Check that the leads are run in their own conduit and that all connections are tightly made For long paths these leads must be shielded and their shielding grounded at the DLC 2 Check to be certain that if the speed control circuit does not have a clamping resistor between its CCW and wiper terminals you have connected all three output terminals of the DLC to their corresponding terminals on the speed control If on the other hand the speed control is already clamped verify that the connection to DLC terminal S1 is correctly left open 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
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