Category: MOOG

Mechanical feedback (mfb) valve input:

The G123-825 interfaces between the current output of a servo amplifier, on one

side, and a Moog valve on the other. This enables old mfb valves to be replaced by

modern electrical feedback (efb) valves, without changing the servo amplifier.

The buffer amplifier takes the existing servo amplifier output and converts it

to an efb compatible signal.

Input filter:

The G123-825 has a filter to remove noise from the input signal. The filter time

constant is switch selectable. The switch selections sum, so a large variety of time

constants is available.

Outputs:

• The output signals are switch selectable. They are:

4 to 20 mA fixed. Suitable for efb valves

• 0 to ±10 V fixed. Suitable for efb valves

• 0 to ±5 to ±100 mA switch selectable. Suitable for mfb valves.

Suitable for efb valves when set to ±10 mA

The output current selector switches can have more than one selected,

so the selected values sum. For example, selecting 30 and 50 mA together

gives a full scale output of ±80 mA.

The buffer amplifier is housed in a compact DIN rail housing and requires

a 24 VDC supply. Front panel test points and valve drive LEDs facilitate

commissioning and trouble shooting.

ADVANTAGES

• Switch selectable input signals

• Switch selectable outputs signals to suit most Moog valves

• Switch selectable input filter

• Vv and Iv LED valve drive indicators

• Valve drive signal test point

• Compact DIN rail mounting

• 24 VDC supply

• CE marked

The G123-825 Buffer Amplifier is intended to interface between the output of

standard signal sources, such as a PLC or servo amplifier, and a Moog servo

proportional valve. It accepts three types of signal input and can output most

of the Moog servoproportional valve signals. It has a single pole active filter

to remove noise from the input signal.

PLC ±10 V and 4-20 mA inputs:

The G123-825 interfaces between standard PLC analog output signals of ±10 V

and 4-20 mA on the input side and the Moog valve on the output side. This solves

the compatibility problem between these signals and the valve requirement.

Mechanical feedback (mfb) valve input:

The G123-825 interfaces between the current output of a servo amplifier, on one

side, and a Moog valve on the other. This enables old mfb valves to be replaced by

modern electrical feedback (efb) valves, without changing the servo amplifier.

The buffer amplifier takes the existing servo amplifier output and converts it

to an efb compatible signal.

Input filter:

The G123-825 has a filter to remove noise from the input signal. The filter time

constant is switch selectable. The switch selections sum, so a large variety of time

constants is available.

Electromagnetic compatibility

The G123-814 emits emissions well below the levels required for CE marking testing.

However, the cable connecting the valve coil should be shielded to ensure that no interfering radiation is

emitted.

Connect both ends of the shielded cable to chassis earth. Use terminals 10 and 14 on G123-814.

Immunity to external interference radiation depends on careful wiring techniques.

The recognised method is to use shielded cables for all connections, the

The accepted method is to use shielded cable for all connections and to radially terminate

the cable shield with a suitable grounded cable gland where it enters the industrial steel enclosure.

If this is not possible, chassis ground screw terminals are available on the G123-814.

The length of bare wire should be minimised. Connect the shield at each end of the cable to chassis

ground.

Allow sufficient length of cable

so that the wires remain connected when the circuit card is removed from the housing. 

This allows the circuitry to be checked while the circuit card is still connected and operational.

For cables connected to the outside of the housing as well as for

cables connected to the adjacent DIN rail unit, an additional 100 mm is sufficient.

The cable to the valve coil carries 1 Amp and should be sized accordingly.

Cables with a conductor size of 0.2 mm2 are normally rated at 1 Amp and are suitable for cable lengths

up to 5 metres.

Cooling

Vents at the top and bottom of the G123-814 chassis provide cooling for internal electronic equipment. 

These vents should be kept clear.

It is important to ensure that the equipment below does not generate

hot exhaust gases that could heat the G123-814.

Wiring

It is recommended that crimped “guide lace sleeves” be used as screw terminals. 

Allow sufficient length of cable

so that the wires remain connected when the circuit card is removed from the housing. 

This allows the circuitry to be checked while the circuit card is still connected and operational.

For cables connected to the outside of the housing as well as for

cables connected to the adjacent DIN rail unit, an additional 100 mm is sufficient.

The cable to the valve coil carries 1 Amp and should be sized accordingly.

Cables with a conductor size of 0.2 mm2 are normally rated at 1 Amp and are suitable for cable lengths

up to 5 metres.

Applying this amplifier

Apply this amplifier to other valves with the same specifications to obtain the same performance as

Hydrolux valves.

The G12-814 is not suitable for conventional open-loop proportional valve applications.

A zero flow condition is highly unlikely as the deadband compensation circuit cancels out spool overlap.

Zero flow conditions are unlikely with zero coil current as the deadband compensation circuit cancels out

spool overlap.

Mounting

Installation consists of mounting a horizontal DIN rail to the vertical rear surface of an industrial steel

enclosure.

The rail release clips on the G123-814 should face downward to allow front panel and terminal

markings to be clearly readable and to allow cooling airflow to the internal electronics.

An important consideration for module placement is electromagnetic interference (EMI) from other

equipment in the enclosure.

For example, VFs and AC servo drives generate high levels of EMI.

be sure to check other equipment for EMC compliance before placing it near the G123-814.

Cooling

Vents at the top and bottom of the G123-814 chassis provide cooling for internal electronic equipment. 

These vents should be kept clear.

It is important to ensure that the equipment below does not generate

hot exhaust gases that could heat the G123-814.

Functions

P, I or P & I control

User-friendly front panel with LEDs and test points

Single-ended input, 4-20 mA or ±10 V, selectable by switch

Single-ended inputs, expandable

Differential Inputs with Zero and Gain

Feedback Sensor Excitation Output

Step Button

Selectable Feedback Derivative Terminology

‘In-position’ output

Jitter

Enable Input

Compact DIN rail housing

CE Marking

Switch Selection

Input 1 On or Off

Feedback input 4-20 mA or ±10 V

Input 2 4-20 mA or ±10 V

Proportional control, integral control or both

Integrator input from unity gain or amplified error signal

Integrator limit

Output current or voltage

Output current level

Dither on or off

Plug-in resistor

Input 2 = 100k for ±10 V

Feedback derivative term = unloaded

Proportional gain range = 100k, 1 to 20 range

Input 2 directly connected to output amplifier = not loaded

 Features

 P, I or P & I control

 User friendly front panel with LEDs and test points

 Single ended input, 4-20 mA or ±10 V, switch selectable

 Single ended input, scalable

 Differential input with zero and gain

 Feedback transducer excitation output

 Step push button

 Optional feedback derivative term

 “In position” output

 Dither

 Enable input

 Compact DIN rail housing

 CE marked

Switch selections

Input 1 lag on or off

Feedback input 4-20 mA or ±10 V

Input 2 4-20 mA or ±10 V

Proportional control, integral control or both

Integrator input from unity gain or amplified error signal

Integrator limit

Output current or voltage

Output current level

Dither on or off

Plug-in resistors

Input 2 = 100k for ±10 V

Feedback derivative term = not loaded

Proportional gain range = 100k for 1 to 20 range

Input 2 direct to output amp = not loaded

Ordering Information

P-I Servoamplifier G122-824-002

Special configurations can be provided. Consult your Moog sales office to discuss details.

The G122-824-002 is a functional replacement for the -001 version. It adds a 4-20 mA option for input 2. output step push button and  improved thermal performance.

Application Notes

1 Scope

These Application Notes are a guide to applying the G122-829A001 P-I Servoamplifier. These Application Notes can be used to:

 Determine the closed loop structure for your application.

 Select the G122-829A001 for your application. Refer also to data sheet G122-829.

 Use these Application Notes to determine your system configuration.

  Draw your wiring diagram.

 Install and commission your system.

Aspects, such as hydraulic design, actuator selection, feedback transducer selection, performance estimation, etc. are not covered by these Application Notes. The G122-202 Application Notes (part no C31015) cover some of these aspects. Moog Application Engineers can provide more detailed assistance, if required.

2 Description

The G122-829A001 is a general purpose, user configurable, P-I servoamplifier. Selector switches inside the amplifier enable either proportional control, integral control, or both to be selected. Many aspects of the amplifier’s characteristics can be adjusted with front panel pots or selected with internal switches. This enables one amplifier to be used in many different applications. Refer also to data sheet G122-829.

General

The Moog Axis Application Software Suite (MASS) offers a state of-the-art development environment for implementing demanding motion control functions using the IEC 61131 standard for development.

MASS includes tools for:

• Programming

• Testing and optimizing

• Debugging Documentation

• Visualization

• Configuration

Interfaces

• Ethernet (TCP/IP and UDP/IP)

• EtherCAT

• CAN/CANopen

• PROFIBUS-DP

Features

Extensive libraries with Moog function blocks, based on 50 years of experience in electric and hydraulic motion control.

• Freely programmable controller structures

• Maximum flexibility by offering a complete scope of functions in all IEC 61131 programming languages

• Simultaneous realization of control, regulation and PLC applications in one application program

• Open standard interfaces for communication with machine and process levels

Benefits

• Quick project realization

• Low programming efforts

• One tool for programming, visualizing and documentation

MASS Functionality

MASS is based on CODESYS 3 which is the standard for IEC 61131 programming. It has been enhanced by Moog by adding motion control functionality. In this way, even complex automation projects can be simplified. MASS includes the following functionality: 

Motion control technology

 • Controller: I, D, PID standard/extended

 • Filter: High-pass, low-pass, notch

 • Non-linear functions: Dead band, nonlinear, dcs-sis.com dual-gain, look-up table

 • Simulation of the process: PT1, PT2

 • Function generator

 • Signal delay

 • Counter

 • Timer

 • Transfer functions: Continuous, time discrete

Moog Motion Control

Moog offers a variety of freely programmable Motion Controllers, each of them designed with specialized functionality to meet a range of customer requirements.

Regardless of your application, we have a Motion Controller that will meet your requirements.

MSC III Motion Controller

The MSC III Motion Controller is a high performance Motion Controller with PLC functionality that is ideal for complex centralized and decentralized applications.

The MSC III Motion Controller offers several fieldbus interfaces, high resolution analog inputs/outputs, position sensor interfaces and digital inputs/outputs.

It is designed for fast and accurate closed-loop control of multiple hydraulic and electric actuators.

MASS (Moog Application Software Suite)

The IEC 61131-3 is an integrated development environment based on CODESYS 3.

MASS offers full programming, dcs-sis.com debugging, simulation, parameterization, visualization and tracing capabilities.

It helps you to achieve enhanced machine performance via special Moog libraries of pre-programmed function blocks, and enables users to solve advanced control problems.

The MASS is designed to improve machine control by providing powerful, advanced capabilities for closed-loop and open-loop control, as well as PLC functionality.