AMP-SOL-2 User Manual ()
Contents
1. controlled by three digital inputs chip enable EN driver 1 enable Veni and driver 2 enable Venz and two analog inputs current commands to program the solenoid currents Vref and Maer When driver 1 is activated by low level on EN input and high on Veni the output transistors of the driver circuit switch ON and current rises through solenoid 1 Refer to Fig 2 A current sense circuit within the driver chip senses the current through the solenoid When the solenoid current equals the current command reference Vref the output transistors are switched OFF and the current in the solenoid starts to decay An internal oscillator fixed at 25 kHz turns ON the output transistors at its next clock pulse and the current in the solenoid rises again When the solenoid current reaches Vref value the output transistors are again switched OFF This process is repeated regulating the solenoid current until Veni goes low The operation of driver 2 is same as above For detailed information on driver operation refer to L295 ST Microelectronics datasheet Solenoid Current Current Command Man Output Transistor OH CFF I I I I I i i i i i l l Channel Enable Sy I I I I I Mem I I I I I I I I i i i i Oscillator AN I I I I H d i H i o time Fig 2 Operation of L295 Driver Signal Conditioning Current Command selector block consists of a low pass filter and two headers JP3 and JP4 Current command can be configured as PWM analo2. AMP SOL 2 Series Solenoid Amplifier Users Manual Servo Tech Inc 1747 W Roosevelt Rd Suite 110 Ph 312 997 3733 Fax 312 997 3734 Chicago IL 60608 www ServoTechInc com TABLE OF CONTENTS 1 The AMP SOL 2 Series Solenoid Amplifier 0 cccceeecc cence ence ence eee eeneeeeaeeeaeees 3 1 1 Components of the Packace sce els Ee 3 12 KT Te CES 4 1 3 Hardware Kugener Ee EEN EE eg 5 1 4 Connection Ports and EE 6 2 Installing Your RE 8 SL HOW Does It Work ee iea enn a EE E AER a EER REE 8 2 2 Howto Wireand Use EE 12 3 Contact Information sis ea eE EERE AEE EEE dae ENER eae IE TEE O EEA KS E aT 13 1 The AMP SOL 2 Series Solenoid Amplifier The AMP SOL 2 Series Solenoid Driver board drives two proportional solenoids The board accepts digital pulse width modulated PWM input 0 5V or analog voltage 0 5V or 0 10V as current command signals The output current is controlled by means of a switching technique 25 kHz steady state allowing efficient operation Each channel can provide up to 2A of regulated current regardless of coil resistance It accepts power supply voltages from 12V to 26V An OK Fault output signal alerts the user of short circuit or open circuit condition at the load Load short circuit and open circuit protection circuit disables the output and the driver becomes functional only when power is recycled Reverse polarity detection circuit disables the power output stage when it detects reverse voltage po
3. MATION For any questions please contact us Address Servo Tech Inc 1747 W Roosevelt Rd Suite 110 Chicago IL 60608 Phone 312 997 3733 Fax 312 997 3734 Web www sServoTechInc com 12
4. en circuit or Short circuit fault when low Current in solenoid 2 0 10 V Commands current in solenoid 2 Ground Current in solenoid 1 0 10 V Ground Connectors JP3 and JP4 N 00 7 gt Ui an Ui OO DI TI IS a vu e Shorting pins 1 2 configures solenoid current command as analog 0 to 5 V e Shorting pins 3 4 configures solenoid current command as analog 0 to 10 V e Shorting pins 5 6 configures solenoid current command as PWM 2 Installing Your AMP SOL 2 2 1 How Does It Work IPI 11 Monitor 1 Step Down ypa g Curent Monitor 2 Converter with ges Reverse Polatit short and Open Circuit 8 Y Detection Frotectior OK Fault 1 Protection Circuits JP2 6 OKiFault 2 Power Power Gnd FWM 1 IPL 4 O 5Vi0 10 Analog 1 Signal Conditioning Driver IP1 5 Solenoid 2 Current Command Circuits PWM 2 mme 0 54 M07 Analog 2 es Enable 1 Enable 2 Signal Gnd Fig 1 Block Diagram of AMP SOL 2 Solenoid Driver Board The AMP SOL 2 solenoid driver board has two independent solenoid driver channels The peak current in each channel can be programmed separately through a current command input which is proportional to a digital pulse width modulated input signal or an analog signal Each channel can be disabled enabled through an enable input signal A current sensing circuit maintains the current irrespective of the fluctuations in the input power supply Two step down v
5. g 0 5 V range or analog 0 10 V range by choosing the jumper JP3 JP4 configuration The PWM current command signal is passed through a second order Sallen Key low pass filter and a resistor voltage divider to generate current command Vyer and Ver2 in the 0 2 V range 100 duty cycle generates a current command of 2 A and 0 duty cycle generates a current command of 0 A The analog commands are scaled down using a resistor voltage divider to generate Vyer1 Vrer2 in the 0 2 V range An analog input voltage of 5V 10V corresponds to 2 A and OV corresponds to a current command of 0 A A current sense circuit senses the voltage across a current sense resistor in series with the solenoid and amplifies it to 0 10 V range A voltage of 10 V at the current monitor output corresponds to 2 A and OV corresponds to 0A Load Short circuit protection block monitors the current through the solenoid and sets a D flip flop if the current increases above 2 4 A The D flip flop disables the driver by making Veni Venz2 low OK status flag goes low Recycling power to the board resets the D flip flop Load Open circuit detection circuit monitors the current through the solenoid and if it is below 0 06 A when the driver is enabled and the current command Van Noen is above 0 15 A OK Fault status signal goes low 10 2 2 How to Wire and Use It Refer to Fig 1 for wiring details 1 To use PWM input as current command for Driver 1 install jumper on pins 5 a
6. larity but it does not change the state of OK Fault signal The current through the solenoid can be monitored as an analog signal in the 0 10V range Features Supply voltage range 12V 26V Two channel output Up to 2A channel current capacity Proportional output current control Output current is regulated with current loop feedback High frequency switching output 25 kHz Accepts both PWM OV low 5V high and analog inputs 0 5V range or 0 10 V range as current command Jumper selected Load short circuit shut down e OK Fault flag to indicate load short circuit or open circuit e Reverse polarity protected by turning OFF power output stage 1 1 Components of the Package 1 AMP SOL 2 Board with two jumpers on JP3 and JP4 installed in default positions 2 Users Manual 1 2 Technical Specifications Input Specifications Power Supply 12 26 VDC Current command Input Signal for each one of two channels PWM 1 and PWM2 0 100 2 kHz to 20 kHz range Non isolated Low lt 0 8 V High 5V TTL and CMOS compatible Or Analog 1 and Analog 2 Analog voltage 0 V to5 V Or Analog voltage 0 V to 10 V Output Specifications Maximum output current per channel 2 A per Channel PWM Output PWM1 PWM2 25 kHz switching frequency under steady state OK Fault Load Short Circuit Open Circuit OK Fault 1 OK Fault 2 Fault Low No Fault High Current monitor output C
7. nd 6 of header JP3 Pins 5 and 6 of header JP4 for Driver 2 The remaining pins of the header should be left open Connect PWM source to pin 2 and its ground to pin 10 or 12 of header JP2 if Driver 1 is configured as in step 1 For Driver 2 use pins 4 and 10 or 12 of JP2 for PWM source and ground respectively To use 0 5V analog voltage as current command input for Driver 1 install jumper on pins 1 and 2 of header JP3 Pins 1 and 2 of header JP4 for Driver 2 The remaining pins of the header should be left open Connect 0 5V analog source to pin and its ground to pin 10 or 12 of header JP2 if Driver 1 is configured as in step 3 For Driver 2 use pins 9 and 10 or 12 of JP2 for input source and ground respectively To use 0 10V analog voltage as current command input for Driver 1 install jumper on pins 3 and 4 of header JP3 Pins 3 and 4 of header JP4 for Driver 2 The remaining pins of the header should be left open Connect 0 10 V analog source to pin 1 and its ground to pin 10 or 12 of header JP2 if Driver 1 is configured as in step 5 For Driver 2 use pins 9 and 10 or 12 of JP2 for input source and ground respectively Connect input power supply 12 26V between pins1 and 2 of header JP1 Connect a proportional solenoid between pins 3 and 4 of JP1 to use Driver 1 Pins 5 and 6 of JP2 to use Driver 2 To enable Driver 1 connect 5V to pin 5 of JP2 Pin 3 of JP2 to enable Driver 2 11 3 CONTACT INFOR
8. oltage regulators LM2937ET 10 and LM2937ET 5 0 generate 10V and 5V required for control circuitry The voltage regulators are reverse polarity protected and turn off when reverse voltage is applied at its input This in turn disables the driver chip By shunting different pins of Headers JP3 and JP4 current command signal can be configured to be a PWM signal analog signal in 0 5 V range or analog signal in 0 10 V range The current sense circuit uses a differential amplifier to detect the voltage across the current sense resistor in series with the solenoid The closed loop current switching logic inside the PWM driver maintains the current in the solenoid equal to the commanded value Under steady state the output switching frequency is 25 kHz The current monitor signals indicate the current through the solenoids A voltage of 10 V at the current monitor output corresponds to 2 A and OV corresponds to OA Short Circuit protection circuit monitors the current through the solenoid and disables the channel if a short is detected at the load OK Fault status signal will go low high for normal operation Once the short at the output is removed recycling power to the board enables the driver Open Circuit detection circuit forces the OK Fault status signal low if an open circuit is detected at the load The Driver block consists of ST Microelectronics solenoid driver chip L295 and associated circuitry It has two independent driver channels and is
9. urrent Monitor 1 Current Monitor 2 OV 10V range corresponding to QA to 2A current output General Specifications Short Circuit protection YES Open Circuit protection YES Reverse Polarity protection YES Electrical Connection Screw terminals 12 16 AWG wire Mechanical Dimensions 4 0 X 3 55 Operating Temperature Range 40 C to 85 C 1 3 Hardware Requirements 1 Power Supply 12 V to 26 V 2 Current Command Signal PWM 0 5V 2 kHz 20 kHz 0 100 duty cycle or Analog Source OV to 5V or OV to 10V 3 Analog Signal Source 5V for Enablel Enable2 signals 1 4 Connection Ports and Cables Connecter JP1 00000 1 2 3 4 5 6 Connector Name 1 Input Voltage 12V 26V 2 Power Ground 3 Solenoid 1 High 4 Solenoid 1 Low 5 Solenoid 2 High 6 Solenoid 2 Low Connector JP2 12 11 10 9 8 7 kb A AER kb AE 1 Connector 1 NnBWN 10 11 12 2 3 435 6 Name Analog Current Command 1 PWM Current Command 1 Enable Driver 2 PWM Current Command 2 Enable Driver 1 OK Fault Status 2 OK Fault Status 1 Analog Current Monitor 2 Analog Current Command 2 Ground Analog Current Monitor 1 Ground Description Commands the current in Solenoid 1 Commands the current in Solenoid 1 Enables Driver 2 when high Commands the current in Solenoid 2 Enables Driver 1 when high Indicates a solenoid 2 open circuit or Short circuit fault when low Indicates a solenoid 1 op
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