SPECIFICATIONS N123-139 Series I-V Converter Drift: Snap Trac Input: Maximum drift = ±200 ppm/°C Polarity of input current must be plus ±0.65 observed; that is, e3 > e4. mV/°C over a temperature range Current to Voltage Converter Range of input current is of 0°C to 50°C. 4 to 20 mADC. Frequency Response: Other input ranges can be used <- 3 dB down at 2000 Hz. by plugging in another resistor at R1. Temperature Range: For 1 to 5 mADC, -20°C to 50°C (-4°F to 122°F). R1=1 KΩ, 1/2 watt Power Required: For 10 to 50 mADC, ±15.0 VDC at ±10 mADC, R1=100 Ω, 1/2 watt regulated, 3-wire For 20 to 100 mADC, (±E) at terminals 5, 6, and 7. R1=49.9 Ω,1 watt This power is available from Model Input impedance = R1. N121-132A Snap Trac Servocontroller. Output: Output voltage depends on Jumper settings (see Configuration Chart on next page). Typically output at terminal 1. JMPR3 JMPR2 JMPR1 Proportional to input current±0.25%. A A A Minimum load resistance ‡5 KΩ. B B B VZERO D5 VIN The N123-139 Snap Trac Current to Voltage Converter contains a DC current to voltage converter with adjustable zero and span. Typically, this module is used to interface a current output device (such as a process controller) to a A1 servoamplifier. The auxiliary differential amplifier may be used for low level amplification of a signal, or may be custom modified if desired. TP7 COMMON C1 C2 A TP2 P1 SPECIFICATIONS Aux Amplifier 12345 6 789 10 Input: Two individual inputs at terminals 8 and 9 or differential input between terminal 8 and 9. Input signal may range from ±0.1 to 100 VDC. Output: Output signal at terminal 10. Load impedance ‡5 KΩ. ±10 VDC max output. FEATURES Construction � Plug-in connectors for quick installation of board. � Test points on all critical signals for easy system setup. DIMENSIONS � Component standoffs on all user-configurable components. Converter: 3.25 in x 2.80 in long � Twenty-turn potentiometers for all adjustable controls. Maximum Component Height: 0.69 in � Rugged construction with solder mask for reliability. D1 R11 D2 R2 R3 SPAN R12 D4 R1 R9 R4 D3 R7 R5 R10 R6 R15 R17 R19 R18 R21 R14 R8 R16 R20 ZERO SN: MODEL:N123-139 N123-139 CURRENT TO VOLTAGE CONVERTER SCHEMATIC INVERTING AMP-2 DIFFERENTIAL AMP -E 11 D1 D2 10 + -E 8 +E R15 A1C 9 - 1N4148 1N4148 TL084CN 20K 4 R2 R3 +E INVERTING AMP-1 B 3 R17 OUTPUT 10K 20K 1 -E SIGNAL VIN A +E 20K 11 JMPR1 4 5 INPUT + 2 7 - 5 R6 SIGNAL R1 A1B Iin 1 6 - A1A TL084CN 249 3 + TL084CN 20K 4 11 SPAN +E -E R4 R11 R5 +E 5 4 R10 10K 10K 20K CW 37.5K TP7 C1 D3 D4 A 10uF R12 POWER +E -E SIGNAL 7 INPUTS 45.3K GROUND 1N4148 1N4148 B (REGULATED) JMPR2 C2 10uF AUX DIFFERENTIAL AMP +E AUX R9 R7 DIFFERENTIAL 10 4.02K 6 -E 20K OUTPUT R16 NF R14 4.99K R19 VZERO R20 ZERO 8 20K 20K 5 B CW R8 +E AUX 10K A DIFFERENTIAL J3 D5 4 INPUT 13 - LM4040CIZ-2.5 14 R18 A1D 12 + TL084CN 9 20K 11 -E CONFIGURATION CHART TP2 R21 NOTES: 20K SPARE Ref Input Output Jumper Settings 2 A 1. NF = NOT FURNISHED INPUT No. (mA) (DC Volts) J1 J2 J3 2.n= PIN 1 (SQUARE PIN) 1 4-20 0 to +10 A A A 3. = INDICATES COMPONENT MOUNTED ON 2 4-20 0 to -10 B A A STANDOFF 3 4-20 -10 to +10 A B B 4. CW = CLOCKWISE 4 4-20 +10 to -10 B B B 5 SEE STANDARD CONFIGURATION CHART 5 4-20 -5 to +5 A A B 6 4-20 +5 to -5 B A B ADJUSTMENTS CIRCUITRY The input current is applied from The polarity of input current Zero (R8) – sets zero output with minimum terminal 3 to terminal 4. Since R1 must be observed; that is, potential at input current. is much less than either R2 or R4, terminal 3 is greater than terminal 4, the voltage drop across R1 is or the zero adjustment will not be Span (R11) – sets signal sensitivities. approximately R1 times the input capable of zeroing the output at (e.g. +10VDC output for +20mA DC input) current. This voltage drop is terminal 1. �AIC is an inverting amp for output differentially amplified by A1A to DC voltages which require special neg obtain a voltage that is approximately MOUNTING: (-) output ranges at terminal 1, proportional to the input current. Mount using Curtiss type TR-3 plastic track including 0 to -10V, +10V to -10V and A1B is an inverting amplifier with (Moog P/N 65419-1) +5 to -5V. For these ranges, J1 is in zero and span adjustments to position ‘B’. produce an output voltage that �AID is an aux differential amp for depends on Jumper settings general low level signal amplification. (see Standard Configuration Chart). Input signals are applied to terminals 8 and 9, with the output signal at The output voltage range at terminal 10. Output voltage range at terminal 1 is 0.0 to +10.0 VDC. terminal 10 is ±10 VDC. CLOSED-LOOP POSITION CONTROL (3-STAGE VALVE) MODEL N121-132A 26 26 SERVOCONTROLLER (Snap-Trac Card) 27 27 230 VAC 115 VAC (ALTERNATE) 50-60 Hz 50-60 Hz 28 28 SCALE 29 29 CMD Input 3 18 22 1 +Er (+10v) 16 LOOP GAIN-1 -Er (-10v) 15 13 A1A A1B A2B 12 R8 FBK Input (0 to +10Vdc Output) 2 +15V reg +E 21 Com 19 SERVOVALVE -15V reg -E 17 Ps R DCD C2 C1 POSITION FEEDBACK 5 6 MODEL N123-139 Ps R -E 6 DEMODULATOR I-V Converter (Snap-Trac Card) 7 +E 5 J1-B (Open) OSCILLATOR ACTUATOR FORCE +E ON 3 5 4 LOAD 8 INV AMP-2 ZERO AUX 9 AMP - A1C J3-A 10 DIFF AMP INV AMP-1 R7 3 CUSTOMER R6 - Iin - SUPPLIED A1B A1A R1 4-20mA + SOURCE 4 CARD SET-UP: 4-20mA Input SPAN J2-B 0 to +10 Vdc Output R6, R7 mtd on Standoffs J1-A (0 to +10Vdc) 1 (Closed) I-V Output CLOSED-LOOP VELOCITY CONTROL WITH ACCELERATION LIMIT INPUT CURRENT Closed-loop velocity control with 3 Suggested Setup Procedure: 4-20 mA MODEL N123-139 FROM PLC 4 CURRENT TO VOLTAGE OR OTHER CONVERTER acceleration limit can be achieved 1. Turn off hydraulic power and relieve pressure. SOURCE 1 57 6 through the use of a servo- 2. Set the GAIN pot (R4) and the INTEGRATOR amplifier. Typically, a packaged pot (R58) on the N121-132A card 21 20 18 rotary servomotor is used, and the approximately five turns from full counter- 26 2 MODEL N121-132 A 27 SERVOCONTROLLER velocity is measured by a DC 115 Vac 50 clockwise. 3 TO 60 Hz TYPICALLY 28 REMOVE R7 11 tachometer driven directly, or 3. Set the SCALE pot (R9) on the N121-132A card 29 12 13 through gearing, from the back of Use shielded fully clockwise. cable. The LESS THAN shield at the 100 FEET the motor shaft. The velocity 4. Remove the tachometer connection from remote end of (30 METERS) the cable must 18 GAUGE be pulled back, command signal is obtained from a terminal [3] on the N121-132A card. cut off and taped to be electrically potentiometer or a command 5. Apply electrical power. isolated. PUMP source such as a Programmable CONTROLLER 6. Adjust ZERO (R8) and SPAN (R11) on the MODEL 63-500 FIXED Logic Controller (PLC). Integral N123-139 card so that 4-20 mA input VARIABLE DISPLACEMENT DISPLACEMENT DRIVE HYDRAULIC PUMP SHAFT MOTOR control is used for improved speed corresponds to ± 10 V output to the N121- LOAD tracking performance. 132A card. Refer to the N123-139 line card. DRIVE DC TACHOMETER Moog Technical Bulletin 7. Re-connect the tachometer lead to terminal [3] TB122 contains a detailed on the N121-132A card. Snap T rac Example summary of sizing criteria and 8. Adjust the GAIN pot (R4) and (R58) on the performance characteristics of N121-132A card for maximum (clockwise) with velocity servos using servomotors. stable controller coil current (no oscillation). 9. Set the SCALE pot (R9) on the N121-132A card In these examples, the for desired speed range vs command signal Current to Voltage Converter is range. Check the stability of the system used to interface with the 4mA to throughout full speed and load range. 20mA current command source 10. Adjust the BIAS pot (R16) on the N121-132A from a PLC to the voltage input of card for zero load speed at zero command the servoamplifier. input. TWO AXIS PROGRAMMABLE LOGIC CONTROLLER (PLC) SERVOSYSTEM The rotary X-axis uses a Current N123-139 N123-137 CURRENT TO RAMP VOLTAGE to Voltage Converter as an GENERATOR 4-20 mA CONVERTER X-AXIS COMMAND ACTUATOR interface between the PLC and the servoamplifier, which consequently SERVOVALVE N121-132A provides closed-loop control of SERVOCONTROLLER the valve/motor drive. The POSITION FEEDBACK Frequency to Voltage Converter SIGNAL B32958 card decodes the pulsed output of POSITION TRANSDUCER SIGNAL CONDITIONER the incremental encoder and MAGNETO-RESTRICTIVE POSITION FEEDBACK TRANSDUCER provides a DC output feedback N123-139 CURRENT TO voltage proportional to the VOLTAGE 4-20 mA CONVERTER Y-AXIS COMMAND rotational speed of the motor. The N122-142A SERVOAMPLIFIER DC Level Detector is configured to trip at a preset feedback voltage level to provide feedback to the SHAFT MOTOR SERVOVALVE PLC when the desired motor VELOCITY FEEDBACK speed has been obtained. INCREMENTAL N123-136 N123-140 ENCODER DC LEVEL FREQUENCY TO VELOCITY DETECTOR VOLTAGE ATTAINED CONVERTER FEEDBACK Industrial Controls Division Moog Inc., East Aurora, NY 14052-0018 Snap T rac Example Telephone: 716/655-3000 Fax: 716/655-1803 Toll Free: 1-800-272-MOOG CDL6174 Rev B 500-200 698 PROGRAMMABLE LOGIC CONTROLLER feedback feedback