CDL6325 Rev C 500-218 698
Industrial Controls Division
Moog Inc., East Aurora, NY 14052-0018
Telephone: 716/655-3000
Fax: 716/655-1803
Toll Free: 1-800-272-MOOG
SNAP TRAC 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=20K
Ω
.
MODEL
N
123-134
EXCITER-DEMODULA
T
OR
MODEL
N
121-132A
SER
VOCONTROLLER
