MOOG P-I Servoamplifier G122-829A001

MOOG P-I Servoamplifier  G122-829A001

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.

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 elctronics 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 Allow sufficient cable length so the circuit card can be withdrawn from its case with the wires still connected.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.

4 Power supply 24V DC nominal, 22 to 28V 75mA @ 24V without a load, 200mA @ 100mA load. If an unregulated supply is used the bottom of the ripple waveform is not to fall below 22V. It is recommended that an M205, 250mA T (slow blow) fuse, compliant with IEC127-2 sheet 3, be placed in series with the +24V input to protect the electronic circuit. If terminal 23 is used to power a proportional valve, the fuse should be increased to cater for the extra current.

5 Set-up adjustments

To access the circuit card switches, the circuit card must be withdrawn from the case. See paragraph 17.

6 Input configuration Inputs 1, 2 and feedback go to the error amplifier and can be used for feedback or command. Care needs to be taken in selecting signal polarity to achieve negative feedback for the overall closed loop. Since the input error amplifier sums the signals, the transducer feedback signal needs to be the opposite polarity of the command. This can be achieved in two ways: 

  Arrange for an opposite polarity feedback transducer signal and connect it to input 1, input 2 or the positive feedback amplifier input. 

  If the feedback transducer signal is the same polarity as the command, you only have one option: Connect it to the negative input of the feedback amplifier.

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