MOOG G122-829A001 P-I servoamplifier

MOOG G122-829A001 P-I servoamplifier

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.

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.

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.

Adjusting feedback amp for 4-20mA input and  0 to -10V output 

· Set the feedback gain to minimum (fully counter clockwise).  The trimpot has 15 turns and will click when minimum is  reached. 

· Connect terminal 17 to terminal 26 (ground). 

· Connect the positive of a variable DC power supply to  terminal 18 and the negative to terminal 26. 

· Connect a digital multimeter (DMM), on DC Volts, between  the front panel feedback amp and ground test points. 

· Set the variable supply to 0.96V. 

· Adjust the feedback amp zero trimpot until the DMM reads  0.00V. 

· Set the variable supply to 4.80V. 

· Adjust the feedback gain trimpot until the DMM reads  -10.00V. 

· Set the variable supply to 0.96V again and check the  feedback test point is still 0.00V. Trim if necessary and check  the 4.80V setting again.

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).

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.

In position 

When the valve drive signal falls below ±10% of the selected  full scale signal, the “in position” signal goes true and provides  an opto-isolated current path between the + and – terminals.  This can be connected to a PLC to initiate the next step in a  control sequence. Do not apply more than 40V to the +  terminal and ensure the load on the – terminal is less than  20mA.