Moog N123-134 Series Manual

N123-134 Series
Exciter/Demodulator
N123-134 Exciter/Demodulator:This SnapTrac module contains a power
oscillator and a demodulator for use with LVDT’s,synchros and other carrier
excited,amplitude modulated,transducers.Carrier frequencies can be set
from 100 to 10,000 Hz.
SPECIFICATIONS
Input
Differential input across terminals
10 and 11.
AC input signal level should
be from .07 to 7.0 Vrms for
±10VDC output.
Input impedance can be assumed
to be 40KΩ(with standard
values of R30,R31,R32, and R33).
Outputs
Excitation Output:
Frequency varies with C3,C4,
and R3.
As shipped:Freq.varies
100 to 2,000 Hz
Remove C3—Freq.varies 500
to 10,000 Hz
Amplitude—2 to 11V p-p
Stability—amplitude varies
≤250 ppm/°C
Demodulator Output:
to ±10 VDC nominal atTerminal 12
Ripple: < 40 mV p-p at
≥carrier freq.
Linearity: ≤±0.2% at 1.2 kHz
Stability: ≤250 ppm gain/°C
±0.1 mV/°C
Polarity: Output at terminal
12 is negative when voltage at
terminal 11 is in phase with
terminal 3
Load Impedance: > 5KΩ
FEATURES
Construction
➢Plug-in connectors for quick installation of board.
➢Test points on all critical signals for easy system setup.
➢Component standoffs on all user-configurable components.
➢Twenty-turn potentiometers for all adjustable controls.
➢Rugged construction with solder mask for reliability.
SPECIFICATIONS
Demodulator Gain: General
expression for gain of the DC voltage
at terminal 12 assuming R33=R32,
R31=R30 and R34 fully CW
(i.e. max span setting)
R32 R37 R45
e12=1.41* *1+ * (e11-e10)VDC
R30 R38 R39
where e10 and e11 are Vrms
DifferentialAmplifier Gain:
Vout = R32 (e10-e11)
R30
Frequency Response: Phase lag of
demodulator output signal increases
linearly from 0˚ to 180˚ as frequency
of modulation increases from zero to
the carrier frequency.
Temperature Range:
-20˚C to 50˚C (-4˚F to 122˚F)
Power Required:
±E: ±15VDC reg,3-wire @ ±50 mA
at pin-6,7 & 8
±V: ±15VDC to ±22VDC unreg @
±40 mA,3-wire at pin-1,2 & 9
(or 7)
This power is available from the
Model N121-132A SnapTrac
Servocontroller.
( )
MOUNTING HARDWARE
➢PVC SnapTrac,Part Number 65419-1
DIMENSIONS
Exciter/Demodulator: 3.25 in x 6.00 in long
Maximum Component Height: 2.42 in
R31
R24
R42
R44
R45
R40
R16
R22
R23
R39
R27
R37
R30
R14
R13
R17
R9
R10
R18
R12
R21
R5
R8
R25
R26
R41
R4
R35
R19
R2
R28
R36
R29
R38
R15
R1
R11
R20
R43
R34
R7
R3
R6
C13 C12
C10
C8
C6
C11
D4
D6
D5
D1
D7
D2
D3
SAMPLE
TP3
TP12
TP7 VIN
U4
J1
U2
U5
U3
U6
U1
Q1
Q2
ZERO
AMP SPANPHASE FREQ
C16
C3
C4
C17
R33
C14 C15
C1
C2
Q3
R32
121112345678910
MADE IN USA
MODEL:N123-134
SN:

N123-134 EXCITER/DEMODULATOR SCHEMATIC
CIRCUITRY
LEAD LAG
-E
-E
-E-E
-E
-E
-E
-E
-V
-E
-E
-E
-E
-E
-E REG
+E
+E
+E
+E
+E
+E+E
+E +E
+E
+E
+E
+E
+E
+V
+E
+E
+E
+E
+E REG
COMM
COM
8
7
9
6
C2
10µF
25V
C1
10µF
25V TP7 U2D
10
11 13
3
12
-
+LM339AN
R31
20K
2
1
R33
20K
D6
1N4148 1N4148
D7 2
3
8
4
1
U4A
-
+
R32
20K
TL082
R30
20K
R34
10K
R35
1K
C11
1µF,63V
11
10 R36
1M
R38
10K
R37
100K
5
68
47
TL082
VIN
C13
0.047µF
100V C15
10µF
25V
+
-U4B
1
8
5
2
91314 U5
SMP10FY
7
11 12
10
C12
0.047uF,100V C14
10µF,25V
C16
0.1µF,100V
R39
10K
C17
NF C18
100pF
2
34
U6
7
6
CA3193
R44
49.9
20K
R45
TP12 (TEST POINT)
12
R40
2.49K 100K
R42
R41
2.49K R43
100K
CW
C3
0.01µFC4 0.0022µFR1
10K R2
10K
6
11 8
10 5
1
U1
4
12 9
3
2
8038 R9
49.9K
4
53
U2A
-
+12
21R10
12.1K
R11
10K R12
12.1K
R13
4.99M
7
6U2B
+
-3
1
12
LM339AN
R14
100K
C5
220pF
R15
20K
R16
49.9K
R17
1M
12
9
83
14
LM339AN
+
-
U2C R18
1.5K
R19
1.5K
R21
22.1K
R20
100K CW C8
1µF,63V
R23
49.9K
0.01µF
C6 C7
33pF
3
2476
8
1
+
-LM301AN
R22
49.9K U3 12
3Q1
TIP29C
R25
10
D1
1N4148
R24
100K
C9
15pF
D2 D3
1N4148 1N4148 R26
10 C10
0.33µF,63V
Q2
3
2
1TIP30C R29
49.9
R27
10K
D4
1N4148
D5
1N4148
R28
464
Q3
2N2222A
2
1
3
TP3
3
4
-
+
R3
10K
R6
10K
R7
10K
R4
18.2K
R5
10K
R8
10K
SAMPLE
CW CW
CW
CW
DEMODULATOR
OUTPUT SIGNAL
EXCITER
LOAD
11:1 GAIN RATIO
DIFFERENTIAL
INPUT
COMMON
+V UNREG
-V UNREG
COM
WAVEFORM
GENERATOR
SPARE
6
5
OSCILLATOR
FREQUENCY
DEMODULATOR PHASE
OSCILLATOR
AMPLITUDE
DEMODULATOR ZERO
DEMODULATOR SPAN
DIFFERENTIALAMP
CW
A precision waveform generator
(U1) provides square, triangular and
sinusoidal signals.The frequency of
these signals is controlled by R3, R4,
C3 and C4.U3 controls the amplitude
of the sine wave between 2 and 11
volts peak to peak depending upon
the setting of potentiometer R20.
Transistors Q1 and Q2 provide
output power drive capability.The
load to be excited is connected
between terminals 3 and 4.
The demodulator consists
of a differential amplifier (U4A),an
adjustable span potentiometer (R34),
and a sample and hold integrated
circuit (U5).The sampling pulse for
U5 is generated when the voltage
of the triangular wave rises above an
adjustable reference voltage (R11).
Potentiometer R11 adjusts the phase
of the sampling pulse over a 150˚
range of the signal to be demodulated.
This allows triggering of the sample
and hold circuit at the peak amplitude.
Inverting amplifier U6 provides zero
adjustment of the sampled signal.
The demodulated signal is available at
terminal 12.
Diodes D6 and D7 provide OP
AMP protection against excessive
voltage differential between the input
terminals.
ADJUSTMENTS
FREQ (R3) – provides trimming
capability for exciter frequency
AMPL (R20) – trims excitation
amplitude
PHASE (R11) – adjusts timing of
trigger pulse for peak sampling of
signal to be demodulated
SPAN (R34) – provides approximately
11:1 gain adjustment of the signal
to be demodulated
ZERO (R43) – provides a zero
adjustment of the signal to be
demodulated
NOTES:
1. ■= PIN 1 (SQUARE PIN)
2. = INDICATES COMPONENT STANDOFF
3.CW = CLOCKWISE
4. NF = NOT FURNISHED
5. = +E & +V JUMPERED FOR POWER DISTRIBUTION
(CUSTOMER OPTION)
6.NOTE: Q1 & Q2 PROVIDE OUTPUT POWER DRIVE
CAPABILITY AND ARE POWERED BY ±V UNREG
SECTION OF SUPPLY.
The products described herein are subject to change at any time without notice,including,but not limited to,product features,specifications,and designs.

TEST SET-UP PROCEDURES
1. Verify ±15 VDC at Pins 6 & 8.
All voltage measurements are
with respect to Pin-7 orTP7 (PC
BoardAnalog Common).
2. Verify Factory Setting: As
shipped,frequency varies 100Hz
to 2Khz.Frequency varies with
C3,C4 & R3.
3. Remove C3 to vary frequency
range from 500Hz to 10Khz.
4. Ensure proper exciter frequency
is selected & configured on card.
5. Connect Ch1 of Scope toTP3 &
monitor voltage waveform.
6. Adjust potentiometer R6 & R7
for Sinewave atTP3.Verify
Waveform Symmetry as
required. Note:Pots are factory
set & should only be adjusted if
waveform symmetry is not
observed.
7. Adjust OSCILLATOR
FREQUENCY pot (R3) for
desired exciter frequency.
8. AdjustAMPLITUDE pot (R20)
for approximately 3 to 4Vp-p at
TP3.Ensure saturation is not
occurring as indicated by upper
& lower flat waveform sections.
9. Connect Ch1 of Scope toTest
Point“Vin” and Ch2 toTest Point
“Sample”
10. Adjust DEMODULATOR PHASE
pot (R11) until Sample Pulse
occurs at Sinewave‘peak’ (LVDT
offset from Zero).Refer to
attached waveform diagrams.
II. The sample pulse will be a very
‘narrow’ pulse as indicated on
waveform plotted from
oscilloscope results.
12. The DEMODULATOR PHASE
pot (R11) adjusts timing of
trigger pulse for peak sampling of
signal to be demodulated.By
adjusting R11,the‘sample’ pulse
can be adjusted more than 150°
of Ch1 waveform (ex.≈40% of
the waveform).
13. Referring to attached diagrams,
FigureA indicates sample pulse
alignment required with LVDT ac
waveform output for the
‘positive’ core position.
14. Figure B Indicates sample pulse
alignment required with LVDT ac
waveform output for the
‘negative’ core position. Figure C
Indicates sample pulse alignment
at the LVDT null or zero
position.
15. Connect Scope to OutputTest
PointTP12.
16. Adjust DEMODULATOR SPAN
pot (R34) and DEMODULATOR
ZERO pot (R43) to obtain
proper scaling atTP12 while
moving LVDT over linear range.
Ensure Demodulator Span
output (U4B) does not enter
saturation.
17. Span & Zero interaction is
normal.Multiple iterations may
be required.
Continue to repeat steps until
both are within specification
without further adjustment.
18. Note:
Operating points on ends of
LVDT coils will become
increasingly non-linear and
should be avoided. An operating
range over the ±Span of the
LVDT core adjustment must be
made to achieve linear
performance results.
333Acqs
Tek Stop: 2.50MS/s
Ch 1 Freq
7.825 kHz
Low signal
amplitude
Ch1 Pk-Pk
1.6V
2
Ch1 5.00V Ch2 5.00V M20.0µsCh1 ∫500mV
Figure C
Hi Res
Tek Run: 2.50MS/s
Ch 1 Freq
7.769 kHz
Ch1 Pk-Pk
13.1V
2
Ch1 5.00V Ch2 5.00V M20.0µsCh1 ∫500mV
Figure B
Hi Res
Tek Run: 2.50MS/s
Ch 1 Freq
7.765 kHz
Ch1 Pk-Pk
15.7V
2
Ch1 5.00V Ch2 5.00V M20.0µsCh1 ∫-2.3V
FigureA

CDL6325 Rev C 500-218 698
Industrial Controls Division
Moog Inc.,EastAurora,NY 14052-0018
Telephone:[phone]
Fax:[phone]
Toll Free:1-800-272-MOOG
SNAPTRAC EXAMPLE
Suggested Setup Procedure:
(Reference Moog Documents N121-132A and N123-134)
1. Turn off hydraulic power and
relieve pressure.
2. Set the GAIN pots (R4 and
R43) on the N121-132A card
approximately five turns from
full counter-clockwise.
3. Set the SCALE pot (R9) on
the N121-132A card full
clockwise.
4. Apply electrical power.
5. On the N121-132A card,
temporarily remove the
feedback connection from
terminals [2] and [6]. Adjust the
BIAS pot (R16) for zero coil
current at midstroke of the
command pot. Re-connect
terminal [2].
6. Apply hydraulic pressure.
7. Adjust the N123-134
Exciter/Demodulator card for
proper GAIN (R34) and PHASE
(R11) by monitoring the voltage
at terminal [12].
8. Re-connect terminal [6] of the
N121-132A card.Turn the
SCALE pot (R9) full counter-
clockwise.
9. Increase the GAIN pots (R4,
R43) clockwise until the system
exhibits the desired sensitivity.
Check the stability of the system
throughout the full load range.
10. Adjust the BIAS pot (R16) for
mid actuator position at zero
command signal,or as desired.
Modifications to the
N121-132A card:
(Reference Moog Document N121-132A)
• Set the jumpers for
proportional control only.
• Insert R45=20KΩ.
MODEL N123-134
EXCITER-DEMODULATOR MODEL N121-132A
SERVOCONTROLLER