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Minarik MM21051C, Руководство пользователя

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39

Single speed potentiometer control of
multiple drives

Multiple drives can be controlled with a single speed adjust
potentiometer using a PCM4 at the input of each drive to provide
isolation (Figure 22). Optional ratio potentiometers can be used to
scale the PCM4 output voltage, allowing independent control of
each drive.

Figure 22.  Single Speed Potentiometer Control of Multiple Drives

Application Notes

Содержание MM21051C

Страница 1: ...USER S MANUAL SCR Filtered Series Filtered SCR Adjustable Speed Drives for DC Brush Motors Models MM21051C MM21151C MM21251C...

Страница 2: ...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 f...

Страница 3: ...Code and all other applicable electrical and safety codes including the provisions of the Occupational Safety and Health Act OSHA when installing equipment It is possible for a drive to run at full sp...

Страница 4: ...0 Line fuses 10 Field output 11 Screw terminal block 12 Speed adjust potentiometer installation 13 Connections 14 Chassis drives 14 Motor 14 Power input 14 Cased drives 15 Motor 15 Power input 16 Volt...

Страница 5: ...2 Adjustable speeds using potentiometers in series 33 Independent adjustable speeds 34 RUN JOG switch 35 Reversing 37 Leader Follower application 38 Single speed potentiometer control of multiple driv...

Страница 6: ...on Trimpot Layouts 27 Figure 14 Typical TORQUE and IR COMP Settings actual settings may vary with each application 31 Figure 15 Multiple Fixed Speeds 32 Figure 16 Adjustable Fixed Speeds Using Potenti...

Страница 7: ...ange 0 130 VDC Armature Voltage 0 5 7 seconds Decel Time Range 0 130 VDC Armature Voltage 0 5 7 seconds Analog Input Voltage Range 0 130 VDC Armature Voltage 0 5 7 VDC Input Impedance S1 to S2 45K Loa...

Страница 8: ...2 Dimensions Figure 1 MM21051C Dimensions ALL DIMENSIONS IN INCHES MILLMETERS FOUR 4 MOUNTING SLOTS 0 188 5 WIDE...

Страница 9: ...3 Figure 2 MM21151C Dimensions ALL DIMENSIONS IN INCHES MM Dimensions...

Страница 10: ...4 Dimensions Figure 3 MM21251C Dimensions ALL DIMENSIONS IN INCHES MM...

Страница 11: ...5 Figure 4 MM21151C and MM21251C Back View Cased Mounting Keyhole Locations...

Страница 12: ...for access to the terminal block and calibration trimpots Mount the drive away from heat sources Operate the drive within the specified ambient operating temperature range Prevent loose connections by...

Страница 13: ...ounted or horizontally bench mounted using the three keyholes on the back of the case See Figure 4 page 5 for mounting hole locations 1 For access to the keyholes and the terminal strip remove the two...

Страница 14: ...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 drive unless...

Страница 15: ...evice 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...

Страница 16: ...fuses All drives have line fuses installed see Replacement Parts section for installed line fuse size Line fuses are rated for maximum rated current Table 1 Recommended Line Fuse Sizes FUSE SIZE AMPS...

Страница 17: ...pproximate Connect Motor Field Voltage VDC Field To 50 F1 and L1 100 F1 and F2 Warning The field output is for shunt wound motors only Do not make any connections to F1 and F2 when using a permanent m...

Страница 18: ...on the terminal block The cased models MM21151C and MM21251C have 7 screws on the terminal block Using a screwdriver turn the terminal block screw counter clockwise to open the wire clamp Insert strip...

Страница 19: ...anel and the 10K ohm speed adjust potentiometer Mount the speed adjust potentiometer through a 0 38 inch 10 mm hole with the hardware provided Figure 6 Twist the speed adjust potentiometer wire to avo...

Страница 20: ...A1 and A2 terminals It is assumed throughout this manual that when A1 is positive with respect to A2 the motor will rotate clockwise CW while looking at the output shaft protruding from the front of...

Страница 21: ...erminals It is assumed throughout this manual that when A1 is positive with respect to A2 the motor will rotate clockwise CW while looking at the output shaft protruding from the front of the motor If...

Страница 22: ...16 Installation Power input Connect the AC power line leads to terminals L1 and L2 as shown in Figure 8 Figure 8 MM21151C and MM21251C Connections...

Страница 23: ...earth ground Figure 9 The range of this signal is 0 6 VDC Connect the signal input to S2 Connect the signal common to S1 Make no connection to S3 A potentiometer can be used to scale the analog input...

Страница 24: ...ise CCW or the reference voltage to zero if in voltage follower mode 2 Apply AC line voltage 3 Slowly advance the speed adjust potentiometer clockwise CW The motor slowly accelerates as the potentiome...

Страница 25: ...2 Turn the speed adjust potentiometer full counterclockwise CCW 3 Apply AC line voltage 4 Set the POWER switch to the ON position 5 Set the FWD REV switch to the desired direction of rotation 6 Set th...

Страница 26: ...nd stopping can produce high torque This may cause damage to motors especially gearmotors that are not properly sized for the application Line starting and line stopping applying and removing AC line...

Страница 27: ...mergency stopping Minarik strongly recommends the installation of a STOP START switch for emergency stopping Inhibit circuit MM21051C ONLY Maintaining a connection between the inhibit pins causes the...

Страница 28: ...nhibit plug with 18 in 46 cm wires 201 0079 Inhibit plug with 36 in 91 cm wires Twist inhibit wires and separate them from other power carrying wires or sources of electrical noise Use shielded cable...

Страница 29: ...ed determined by the MIN SPD trimpot setting If the MIN SPD trimpot is set full CCW the motor decelerates to zero speed when the switch between S1 and S2 is closed The DECEL trimpot setting determines...

Страница 30: ...still active while the drive is in the inhibit mode NOTE Model MM21251C is equipped with dynamic braking Dynamic braking Warning For frequent starts and stops use coasting to a stop shorting inhibit t...

Страница 31: ...25 Figure 12 Dynamic Braking Circuit Connection Operation...

Страница 32: ...e CW rotation and decrease with counterclockwise CCW rotation Use a non metallic screwdriver for calibration Each trimpot is identified on the printed circuit board Warning Dangerous voltages exist on...

Страница 33: ...27 Calibration Figure 13 Calibration Trimpot Layouts MM21051C MM21151C MM21251C...

Страница 34: ...m motor speed when the speed adjust potentiometer is turned full CW It is factory set for maximum rated motor speed To calibrate set the MAX SPD trimpot full CCW Turn the speed adjust potentiometer fu...

Страница 35: ...he degree to which motor speed is held constant as the motor load changes It is factory set for optimum motor regulation Recalibrate the IR COMP setting when using a lower horsepower motor Refer to th...

Страница 36: ...o the recommended TORQUE settings below or recalibrate using the following procedure 1 With the power disconnected from the drive connect a DC ammeter 0 15 A minimum scale in series with the armature...

Страница 37: ...31 Figure 14 Typical TORQUE and IR COMP Settings actual settings may vary with each application Calibration...

Страница 38: ...tentiometer with series resistors with a total series resistance of 10K ohms Figure 15 Add a single pole multi position switch with the correct number of positions for the desired number of fixed spee...

Страница 39: ...djust potentiometer with a single pole multi position switch and two or more potentiometers in series with a total series resistance of 10K ohms Figure 16 shows a connection for fixed high and low spe...

Страница 40: ...position switch and two or more potentiometers in parallel with a total parallel resistance of 10K ohms Figure 17 shows the connection of two independent speed adjust potentiometers that can be mount...

Страница 41: ...y closed momentary operated pushbutton for the JOG pushbutton In the first wiring option connect the RUN JOG switch and JOG pushbutton to the inhibit plug as shown in Figure 18 The motor coasts to a s...

Страница 42: ...19 When the RUN JOG switch is set to JOG the motor decelerates to minimum speed minimum speed is determined by the MIN SPD trimpot setting Press the JOG pushbutton to jog the motor Return the RUN JOG...

Страница 43: ...on switch rated for at least 125 VDC 6 Amps The dynamic braking resistor should be ceramic encased and a minimum of 25W 10 watts The motor stops less rapidly with higher brake resistor values Wait for...

Страница 44: ...The PCM4 isolates the leader motor from the follower drive and outputs a voltage proportional to the leader motor armature voltage The follower drive uses this voltage reference to set the speed of th...

Страница 45: ...gle speed adjust potentiometer using a PCM4 at the input of each drive to provide isolation Figure 22 Optional ratio potentiometers can be used to scale the PCM4 output voltage allowing independent co...

Страница 46: ...that there are no short circuits or grounded connections 6 Check that the voltage selection switch settings match the AC line and output voltages 7 Check that the drive s rated armature and field outp...

Страница 47: ...Motor field connections are loose shunt wound motors only Problem Line fuse blows Motor runs too fast at maximum speed setting Suggested Solutions 1 Check that the line fuse is correct for the motor s...

Страница 48: ...s in current limit 5 Drive is not receiving AC line voltage 6 Motor is not connected Suggested Solutions 1 Increase the speed adjust pot or voltage setting 2 Check connections to input Verify that con...

Страница 49: ...d MAX SPD page 28 2 Check motor field connections and voltage 1 Increase MAX SPD setting page 28 2 Increase IR COMP setting page 29 3 Check motor load Resize the motor and drive if necessary 1 Adjust...

Страница 50: ...44 Figure 23 MM21051C MM21151C and MM21251C block diagram Block Diagrams...

Страница 51: ...45 Figure 24 MM21151C switching circuit connections...

Страница 52: ...46 Block Diagrams Figure 25 MM21251C switching circuit connections...

Страница 53: ...8A 3AB 050 0023 MOV501 275Vrms 4500A peak MOV 075 0011 R501 0 2 ohm 5W feedback resistor 032 0015 SCR501 502 600V 20A SCR 072 0017 T501 3FS 324 001 transformer 230 0084 X Choke 240 0006 10K ohm potent...

Страница 54: ...48 Notes...

Страница 55: ...C Limitations of Liability In the event of any claim for breech of any of the Corporation s obligations whether express or implied and particularly of any other claim or breech of warranty contained i...

Страница 56: ...pson Avenue Glendale CA 91201 2011 Tel 1 800 MINARIK 646 2745 Fax 1 800 394 6334 www minarikcorp com Document number 250 0100 Revision 5 Printed in the U S A 7 01 North America 10 00 Outside North Ame...

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