Adjusting OmniTurn Servo Amps
Why to balance an amp: If the machine is having problems
with motion. Such as overshooting, bad arcs, bad finishes, axis
shutting down for no reason.
Why not to balance an amp: The amp is not
responsible for maintaining location. If the slide is not
repeating start with tests relating to location such as
Ctrl-H and Ctrl-C.
Before balancing the amps perform the Ctrl-E test. This will tell if the amp needs to be balanced - See Below.
When replacing an MC2 card or 12V power supply it is necessary to rebalance the MC2 card first, then the amps. If the MC2 card is out of balance you will will not be able to use the BALANCE pot on the amp to bring the at rest number to 0.
The act of balancing an amp is just that: BALANCING. The
amp is in a loop with its motor. If you understand what is
going on, then the balancing of the amp should be easier and
we won’t get back so many good amps tagged NG.
Adjustments with servos off
Before turning servos on, connect a Digital Volt Meter to pins X axis (4 -black & 5 -brown ) or Z axis (4-Blue & 5-Green) on the brown connector of the Amp. Set the Motion Card offset voltage to 0V (+-.002V) using the balance pots on the side of the MC2 Card (from left to right, X-Balance Pot, Z-Balance Pot ). See photos below for location of pots on MC2 card (from left to right, X-Balance Pot, Z-Balance Pot ). See photos below for location of pots on MC2 card.
Tuning OmniTurn Gold Amps
Turn the balance pot so that both the x and z numbers are close to 0 (within one or 2).
Press 2 for jog speed 2.
Now we will adjust the Tach/Gain and Signal pots. Read the next steps completely before performing the operation.
Now turn the Signal pot until the display gets to 125
Go back to the Tach/Gain pot and turn down to 100, you are done.
If the number stops at 125 no matter how much
you continue to turn the pot, the amp is
If the number will not go to at least 125 the signal pot needs to be turned up.
After these adjustments are made it will be necessary to adjust the Balance back to 0.
If the axes are vibrating turn the COMP pot CW until there is no vibration.