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208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322-3026

OPERATION

SERVICE MANUAL

for

Torque-Switch Series®

Model SMA7215

Brush Type Amplifier System

MANUAL#: 7015-2040
REVISION: (A)
DATE: 15APR98.

Summary of Contents for SMA7215

Page 1: ...208 Standard Street El Segundo California 90245 U S A 310 322 3026 OPERATION SERVICE MANUAL for Torque Switch Series Model SMA7215 Brush Type Amplifier System MANUAL 7015 2040 REVISION A DATE 15APR98...

Page 2: ...1 3 2 Signal Inputs 8 1 3 3 Digital Inputs 8 1 3 4 System 8 1 3 5 Outputs 8 1 3 6 Mechanical 8 Chapter Two Theory of Operation 2 1 Introduction 9 2 2 Driving DC Servo Motors 9 2 3 Servo Loops 10 2 4...

Page 3: ...Connector 19 4 3 4 Amplifier Connections 18 19 4 3 4 1 The Power Connections 18 4 3 4 2 The Signal Connections 18 19 4 3 5 Test Point 19 Chapter Five Configuration 5 1 Introduction 20 5 2 Logic Input...

Page 4: ...lt 27 7 2 3 High Speed Electronic Circuit Breaker HS ECB Fault 27 7 2 4 Low Speed Electronic Circuit Breaker LS ECB Fault 27 7 2 5 Over Temp Fault 27 7 2 6 Over Voltage Fault 28 7 2 7 Resetting A Faul...

Page 5: ...ier model SMA7215 There is also an informative theory of operation chapter We suggest that you take the time to read this manual from cover to cover before attempting to work with these amplifiers for...

Page 6: ...has several protection circuits to protect the amplifier motor and operator from almost any kind of fault Several LED s show what fault has occurred and a separate output can be used to signal other...

Page 7: ...ter a fault High Speed Electronic Instantly shuts down the amplifier in the event of a short Circuit Breaker across outputs and or ground fault condition HS ECB i e amplifier exceeds 80A for 10microse...

Page 8: ...40A peak 1 3 2 Signal Inputs 1 3 3 Digital Inputs Limit Clamp and Reset 50V max Terminated by 10 000 Fault as input 40V 5V max Terminated by 10 000 Typical for all digital inputs Digital inputs have h...

Page 9: ...ear amplifiers are simple accurate and effective However they are very inefficient and they generate a lot of heat Linear amplifiers are used when low electrical noise high bandwidths 2KHz or higher a...

Page 10: ...g amplifier compares the command current velocity error with the actual current in the motor and produces an error voltage proportional to the difference between the actual and commanded current Final...

Page 11: ...ings As the rotor turns the brushes switch the current flow to the windings which are optimally oriented with respect to the magnetic field which in turn produces maximum torque In a brushless motor t...

Page 12: ...tion of Output Switching Transistors The output transistors for all intents and purposes operate in only two states They are analogous to ON OFF switches When an output transistor is OFF there is no c...

Page 13: ...owing from A through C Figure 2 5 Transistor switching waveform at zero current Figure 2 6A Transistor switching waveform when current flows from A through C If the input to the current loop had been...

Page 14: ...e current command signal but opposite in polarity The type of loop described above is referred to as a servo loop because the current servos about a commanded value We are surrounded in our everyday l...

Page 15: ...our customer will be able to create the correct model number of the product that you need as quick and as accurately as possible Differential or Single ended Signal Inputs 0 Single Default 1 Different...

Page 16: ...me sort of shielding on the motor wires is necessary to meet FCC RFI EMI guidelines and to protect other equipment from the effects of RFI EMI We recommend that shielded wire be used or the wires shou...

Page 17: ...options one can choose to use for the power connector The specifications of all the mentioned connectors are listed as follows AUGAT RDI 6 Series Tri Barrier Terminal Blocks AUGAT P N 6PCR 04 Default...

Page 18: ...Housing molex P N 22 01 3167 red nylon housing 16 positions with polarizing rib Crimp Terminals molex Crimp Terminals molex P N 08 55 0102 15 microinch select gold plated brass 4 3 4 Amplifier Connect...

Page 19: ...an inhibit input LS ECB J1 13 Goes high if the Low Speed Electronic Circuit Breaker turns on HS ECB J1 14 Goes high if the High Speed Electronic Circuit Breaker turns on OVERVOLT J1 15 Goes high if th...

Page 20: ...active high or active low signals and pulled up or pulled down termination type A B C and D All logic inputs have a selectable 0 to 5VDC or 0 to 15VDC range Type A Requires grounding of input to disa...

Page 21: ...n BEMF mode Required Equipment Oscilloscope voltmeter battery box The battery box serves as a step input voltage command applying and removing a flashlight battery can also be used for this function G...

Page 22: ...h will yield the desired waveform The optimum setting will occur when Tach Gain is as CW as possible and Compensation is as CCW as possible However the servo loop may become unstable the motor oscilla...

Page 23: ...RV1 Loop Gain LOOP GAIN Used to shut off uncalibrated amplifiers When the loop gain is fully CCW no current is delivered to the motor RV6 Differential Gain DIFF SIG GAIN Sets the input voltage to cur...

Page 24: ...single ended input set battery box for a known DC voltage Apply input signal pulses and adjust the Signal Gain RV7 pot to obtain the desired current gain of the amplifier 5 If the motor is rotating in...

Page 25: ...ation on future units and repair on this unit Although not a substitute for the calibration procedure it will at least get you in the ballpark Remove the power and allow all capacitors to discharge be...

Page 26: ...CATE AND CORRECT THE CAUSE OF THE FAULT BEFORE REPEATED RECYCLING OF POWER TO THE AMPLIFIER TO PREVENT POSSIBLE DAMAGE 7 2 1 Table of Fault LED Conditions Input or Fault Condition RUN LED HS ECB LED L...

Page 27: ...to ground 7 2 4 Low Speed Electronic Circuit Breaker LS ECB Fault When the RMS output of the amplifier exceeds 13A for standard or 18A for high power for 5 seconds the Run LED will turn off the LS ECB...

Page 28: ...o apparent fault the drawings in appendix will enable a skilled technician to trouble shoot an amplifier to even lower levels 7 4 Factory Repair Should it become necessary to return an amplifier to Gl...

Page 29: ...pair or replacement of defective parts Any product or part manufactured by others and merely installed by us such as an electric motor etc is specifically not warranted by us and it is agreed that suc...

Page 30: ...GLENTEK Inc 208 Standard Street El Segundo California 90245 U S A 310 322 3026 30 Appendix Amplifier Drawings...

Page 31: ...31 GLENTEK Inc 208 Standard Street El Segundo California 90245 U S A 310 322 3026 SMA7215 MANUAL...

Page 32: ...GLENTEK Inc 208 Standard Street El Segundo California 90245 U S A 310 322 3026 32 APPENDIX AMPLIFIER DRAWINGS...

Page 33: ...CH SIG GAIN SIGNAL TACH GAIN OVER TEMP DIFF SIG GAIN OVER VOLT COMP TEST POINTS J2 LEDS COMP POTS TACH BAL SIG GAIN DIFF GAIN I LIMIT FLDBK IR COMP 15 14 16 11 10 1 13 12 J1 LIMIT COMMON SIGNAL IN DIF...

Page 34: ...Brushless Servo Amplifiers Linear Brushless servo amplifiers to 2 25KW PWM Pulse width modulated Brushless servo amplifiers to 65KW Permanent Magnet DC Brush Type Servo Motors Continuous Torques to 3...

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