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MOOG-G122-829A001-P-I Servoamplifier
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MOOG-G122-829A001-P-I Servoamplifier

+86-15305925923
Mr.Wang
wang@kongjiangauto.com

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.

18384.00
¥28283.00
Weight:33.000KG
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  • Telephone:+86-15305925923
  • contacts:Mr.Wang
  • Email:wang@kongjiangauto.com
Description

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.


MOOG-G122-829A001-P-I Servoamplifier

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.

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 G122-829A001 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 G122-829A001 close by.

3.2 Cooling Vents in the top and bottom sides of the G122-829A001 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 G122-829.

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. The screw terminals will accommodate wire sizes from  0.2mm2 to 2.5mm2 (24AWG to 12AWG). One Amp rated,  0.2mm2 should be adequate for all applications.

3.4 EMC The G122-829A001 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 G122-829A001.  Exposed wires should be kept to a minimum length. Connect  the screens at both ends of the cable to chassis ground.

6.2 Input 1 An input to the error amplifier: This input is ±10V  non-inverting and has two important features:  It has a scale pot on its input that enables large inputs to be  scaled down to match smaller signals on other inputs. Scale  range is 10 to 100%. Set fully clockwise (FCW), an input of  100V can match a 10V signal on the other inputs. Note that  the maximum permissable input voltage is ±95V.  It has a switch selectable (SW4:2) lag of 55mS that can be  used to remove transients from the input signal that could  cause unwanted rapid movement in the output. Input 1 is well suited to be a command because of these two  features. If input 1 is used for feedback, be sure the lag is  switched off. Input resistance after the scale pot is 94k Ohms. 6.3 Input 2 An input to the error amplifier: This input is differential, with  non-inverting and inverting inputs. It is switch selectable (SW5)  between 4-20mA and ±10V. The 4-20mA converter produces  0 to +10V for 4 to 20mA input to terminal 7. R34 connects  from the output of the amplifier to the input of the error amp.  It is a plug-in resistor with a default value of 100k Ohms,  giving a nominal ±10V input signal range when V is selected.  Input 2 is suitable for command or feedback. R34 can be  increased to give a larger input range. Terminal 8. the inverting input, can be connected to ground  with SW6:1. 6.4 Input 3 An input to the output summing and limiting amplifier via a  plug-in resistor, R33. A typical use for this input is command  feed forward or closing the outer loop of a three stage valve.  With R33 at 10k Ohm, a ±10V input will produce ±100% valve  drive. Increasing R33 reduces the valve drive. The summing amp gain can be changed with plug-in resistor  R27. This is useful if input 3 is being used to close the outer  loop of a three stage valve. 7 Output configuration Select the output to match the input requirements of the valve  (SW2).  When voltage (V) is selected, ±10V is available into a  minimum load of 200 Ohm.  When current (I) is selected, the current level switches  (SW1:X) enable ±5 to ±100mA to be selected. The switch  selections sum, so, if for instance 45mA is required, select  30.10 and 5. The output can drive all known Moog valves  up to ±100mA. The maximum load at I (Amp) output is: RL max = 11V – 39 Ohm I (Amp) eg. at 50mA RL max is 181 Ohm  When 4-20mA is selected, the output V/I switches must be  in I and the output current SW1 must have switch 3 selected  for 20mA. Maximum load for 4-20mA output is 500 Ohm. The output amplifier is limited to approximately 105% of the  selected full scale output. If both the proportional and  integrator stages are saturated, the output will not be twice  the selected full scale but still only 105% of full scale. 8 Step push button The step push button (SW3) injects -50% valve drive  disturbance into the output. When released, the valve drive  reverts to its original level. This feature is useful for closed loop  gain optimisation.

9 P-I selection For position closed loops, initially select only P (SW6:2). For  pressure or velocity loops select I (SW6:4) initially and then P.  See paragraph 12 below for more detail. For a complete  discussion of P and I control, see the G122-202 servoamplifier  Application Notes (part no C31015). 10 Integrator input The servoamplifier has a unity gain input error amplifier  followed by two parallel stages, one a proportional amplifier  and the other an integrator. The outputs of these two stages  can be switched to the output power amplifier (see paragraph  7 above) which then drives the valve. The input to the integrator stage can be switch selected  (SW4:1) from either the output of the error amplifier, I in = E,  or the output of the proportional stage, I in = P. The latter  arrangement is used in the G122-202. It is beyond the scope  of these Application Notes to detail the benefits of each  arrangement. If you have experience with the G122-202.  I in = P would seem to be an easy choice. 11 P only gain For position loops select only P control (SW6:2). Input a step  disturbance of 50% valve current with the step push button  (SW3). Adjust the P gain for the required stability, while  monitoring the front panel valve test point, or the feedback  signal. The gain range of the proportional amplifier can be  moved by changing the plug-in resistor R17. The value loaded  when shipped is 100k Ohms, which gives a 1 to 20 range.  Selecting 200k Ohms will give 2 to 40. The circuit will function  correctly with the value of R17 between 100k Ohms and  10M Ohms. Note that as P gain is increased, the movement due to the step  push button decreases. 12 P and I gains together If you are inexperienced with integral control the following set-up method is a good starting point.  I in = E: Initially select only I (SW6:4). Press the step push  button (SW3). Increase I gain until one overshoot in the  feedback signal is observed. Next select P (SW6:2) and I (SW6:4) together and increase the  P gain to reduce the overshoot. For the I in = E arrangement the P and I sequence could be  reversed. i.e.: adjust P first, followed by I.  I in = P: For an I in = P arrangement, only the “P followed  by I” sequence of adjustment can be used. For a more thorough discussion see G122-202 Application  Notes (part no C31015). 13 I limit The contribution from the integrator to the output amplifier  can be reduced by selecting I limit on (SW6:3). When this  switch is on the integrator contribution is reduced to  approximately 15% of the level when it is off. This feature is  useful in a position loop that may require integral control to  achieve the required steady state accuracy. The limited integral  control removes valve null error when the final position is  reached. It is also useful in a pressure loop to limit overshoot,  if the valve drive saturates.


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