Moog G123-815 Supplement

Page 1 of 4: C31885 Rev B 10.03
1 Scope
These application notes are a guide to applying the G123-815
Buffer Amplifier. They tell you how to install, connect and
adjust the Buffer Amplifier. They do not tell you how to design
the closed loop system in which it is used.
2 Description
The G123-815 Buffer Amplifier interfaces between standard
PLC analogue input and output modules, on one side, and
a position transducer and a Moog valve, on the other.
It simplifies the use of a PLC in closing position loops.
The Buffer Amplifier solves the common problem of the
±10V PLC output being incompatible with the valve drive
requirements. It also provides digital noise filtering for the valve
signal and noise filtering for the position transducer signal.
For a more detailed description, see Moog brochure
G123-815E01.01.
3 Installation
3.1 Placement
A horizontal DIN rail, mounted on the vertical rear surface of
an industrial steel enclosure, is the intended method of
mounting. The rail release clip of the G123-815 should face
down, so the front panel and terminal identifications are
readable and so the internal electronics receive a cooling
airflow. An important consideration for the placement of the
module is electro magnetic interference (EMI) from other
equipment in the enclosure. For instance, VF and AC servo
drives can produce high levels of EMI. Always check the EMC
compliance of other equipment before placing the G123-815
close by.
3.2 Cooling
Vents in the top and bottom sides of the G123-815 case
provide cooling for the electronics inside. These vents should
be left clear. It is important to ensure that equipment below
does not produce hot exhaust air that heats up the G123-815.
Buffer Amplifier
G123-815
3.3 Wiring
The use of crimp “boot lace ferrules” is recommended for the
screw terminals. Allow sufficient cable length so the circuit
card can be withdrawn from its case with the wires still
connected. This enables switch changes on the circuit card to
be made while the card is still connected and operating.
An extra 100mm, for cables going outside the enclosure,
as well as wires connecting to adjacent DIN rail units, is
adequate.
Application Notes
probe
Iv
valve
Vv
0V
BUFFER AMP
Bottom
vents
Cooling
airflow
release
Screw
terminals
Top vents
Screw
terminals
DIN rail
9 - 16
1 - 8
clip
Cover
release
tab (2)
DIN rail
12 34
9101112
56 78
13 14 15 16
cable gland 100mm Loop
Wires
Enclosure
Radial screen
termination
Cable
Grounded EMI
Preferred Wiring
m

Page 2 of 4: C31885 Rev B 10.03
3.4 EMC
The G123-815 emits radiation well below the level called for in
its CE mark test. Therefore, no special precautions are required
for suppression of emissions. However, immunity from external
interfering radiation is dependent on careful wiring techniques.
The accepted method is to use screened cables for all
connections and to radially terminate the cable screens, in an
appropriate grounded cable gland, at the point of entry into
the industrial steel enclosure. If this is not possible, chassis
ground screw terminals are provided on the G123-815.
Exposed wires should be kept to a minimum length. Connect
the screens at both ends of the cable to chassis ground.
4 Power supply
24V nominal, 22 to 28V
20mA @ 24V without a load, 145mA @ 100mA load.
If an unregulated supply is used, the bottom of the ripple
waveform is not to fall below 22V.
5 Set-up adjustments
5.1 Digital noise filter
This filter removes the digital quantization noise, due to the
PLC update period, in the PLC output signal. Because PLC’s can
have low frequency period noise that the valve can respond to,
it is important to remove this update rate noise so the valve
does not buzz and the load does not follow. The update
period of the PLC needs to be known so the correct filter time
constant can be selected. Initially set the filter period to be
equal to the update rate. Switch values sum, so if you need
15mS, select 10 and 4.7.
When the system is operating, a final check of the time
constant can be made. If the valve buzzes, a greater time
constant is required. If the valve does not buzz, reduce the
time constant until buzzing is detected, then increase it until
the buzzing just stops.
To calculate the 3dB frequency roll off point, use the formula:
f = 159 Hz, where T = the sum of mS period switches selected
T
5.2 Low Rin
The “low Rin”switch drops the input resistance for the PLC
signal from 100k Ohm to 1k Ohm. This can improve the noise
immunity of the signal. Be sure the PLC output can deliver
±10mA that is needed when low Rin is selected.
5.3 Valve drive signal
Select the output signal to match the valve requirement.
If voltage is selected, the ± 10V output can drive up to ±
10mA. If current is selected, the full scale current output will
then need to be selected on the valve current switches. The
switches sum, so if 45mA is required, select 30, 10 and 5mA.
Maximum output current, in current mode, is ± 100mA.
6 Test points and indicators
The Iv and Vv LEDs show the polarization and level of the
selected output signal.
The valve test point gives the actual voltage on the valve
output terminal. When the output signal is selected as current,
a knowledge of the valve’s input resistance is needed to
interpret the test point signal. For instance, if 10mA is selected
and a valve with 200 Ohm input resistance is connected, the
signal on the valve test point will vary between ± 2V.
The probe test point enables a check of the filtered position
transducer signal.
7 Withdrawing the circuit card from
its case
The circuit card needs to be withdrawn from its case to set the
digital noise filter switches, to select the output signal type,
to select the current and to select low Rin.
To do this, push one tab in with a pen or screwdriver, while
gently pulling on the top cover on that side. The cover will
release approximately one mm. Repeat on the other side and
then withdraw the cover and circuit card until the required
switches are exposed. The rigidity of the connecting wires will
hold the circuit card in position while the switches are set.
Cable gland
100mm Loop
Cable
Enclosure
Cable
Wire soldered
to screen
Drain wire.
or
(Heat shrink to
cover the screen)
Alternative Wiring
probe
Iv
valve
v
0
Test point
Test point
Test point
LED
LED
BUFFER AMP
1
2
3
4
5
6
7
8
5
10
20
30
50
mA
V1
2
3
4
5
0.22
4.7
10
22
Lo Rin
Output
Filter
mS
not in use
Output
V
6
7
8
2.2
S1
S2

Page 3 of 4: C31885 Rev B 10.03
9 Specifications
Valve drive input: 0 to ± 10V
Valve drive outputs: 0 to ± 10V @ 1K Ohm min
0 to ± 100mA max
max load = (11 V –39)Ohm
I (Amp)
Valve drive current ±5, 10, 20, 30 & 50 mA
selections:
Valve drive test point: Zo = 10K Ohm
Probe test point: Zo =10K Ohm
Vv LED: Maximum illumination at
± 10V
+ = red
–= green
Iv LED: Maximum illumination at
±5 mA \ ±100mA
+ = red
–= green
Valve filter type: Active, single pole
Valve filter corner 7, 16, 34, 72 & 723 Hz
frequency selections: ±10%
Probe filter corner 154Hz ±10%
frequency:
Class of protection: IP 20
Supply: 24 V nominal, 22 to 28 V
20 mA @ 24 V, no load,
145 mA @ 100 mA load
Terminal 10 max current: 500 mA
Mounting: DIN rail
Temperature: 0 to 40°C
Dimensions: 100W x 108H x 22.5D
Weight: 120g
CE mark: EN50081.1 emission
EN50082.2 immunity
C tick: AS4251.1 emission
8 Block-wiring diagram
+15V
-15V
0V
TP
Power Supply
1
2
+24V
0V
0.22mS (723Hz)
2.2mS (72Hz)
4.7mS (34Hz)
10mS (16Hz)
22mS (7Hz)
100K
1K
Lo Rin
switch
command
0Vref
probe
3
4
8
Valve Command Filter LED
Vv
V
Voltage Amplifier
Current Amplifier
5mA
10mA
20mA
30mA
50mA
Output current
select switches
Output
TP
valve
10
9
14
LED
Iv
1mS (160Hz)
Probe Filter
470 Ohm
TP
probe
16
11
12
valve
select
+24V
+24V
Note 1: Connect cable screen to enclosure cable gland.
Note 2: Terminal 10 cannot power a DDV
15
13
7
5
Filter
select
switches
+
+
+
100K
+24V Supply
Signal
0Vref
Position
Transducer
+24V
Supply
PLC
see note 1
see note 1 see note 1
see v
see note 2
alve wiring diagrams
(4 switches)
Valve
below.
10
9
14
13
A
D
B
E
10
9
14
13
A
D
B
C
10
9
14
13
A
B
C
D
Valve wiring diagrams
8.1 Proportional valve (efb) 8.2 Servovalve (mfb) series
coils
8.3 Servovalve (mfb) parallel
coils

Page 4 of 4: C31885 Rev B 10.03
This page left blank intentionally
Industrial Controls Division. Moog Inc., East Aurora, NY 14052-0018. Telephone: [phone]. Fax: [phone]. Toll Free 1-800-272-MOOG.
Moog GmbH. Germany. Telephone: [phone]. Fax: [phone].
Moog Sarl. France. Telephone: [phone]. Fax: [phone].
Moog Australia Pty. Ltd. Telephone: [phone]. Fax: [phone].
Moog pursues a policy of continuous development and reserves the right to alter designs and specifications without prior notice. Information contained herein is for guidance only and does not form part of a contract.
Australia: Melbourne, Sydney, Brisbane Austria: Vienna Brazil: S~
ao Paulo Denmark: Birkerød England: Tewkesbury Finland: Espoo France: Rungis Germany: Böblingen, Dusseldorf Hong Kong: Shatin India: Bangalore
Ireland: Ringaskiddy Italy: Malnate (VA) Japan: Hiratsuka Korea: Kwangju-Kun Philippines: Baguio City Singapore: Singapore Sweden: Askim USA: East Aurora (NY)
Internet Data
For a detailed Data Sheet and the latest version of these
Application Notes, please refer to the Moog website
www.moog.com/dinmodules
M