Delta RMC101 - Manual (Page 626)

RMC100 and RMCWin User Manual
7-2
Overdrive Error
Position Overflow
Parameter Error
Integrator Windup
Transducer counts field not indicating transducer location
See ”r;Axis LEDS are red” above.
Transducer counts field changes but output drive does not work
See ”r;During a move, the drive comes to a halt for no apparent reason” above.
The System is unresponsive and hard to tune
This problem could have several causes. The first items to check are:
1. Is hose, rather than rigid pipe, installed between the hydraulic valve and the cylinder? The hose
expands and acts like an accumulator and the fluid goes to fill the hose rather than move the
cylinder.
2. Does the valve have overlap? Overlap in hydraulic valves causes a significant dead band and
slows the system response. Some proportional valve amplifier cards have dead band eliminator
circuits that make tuning easier.
3. If you have a servo motor and a ball screw, is there any backlash? Backlash produces a dead
band when the axis changes direction, so the controller will tend to oscillate around the dead
band.
The axis oscillates
This problem could have several causes. The first items to check are:
1. Make sure that the Dead Band Eliminator value is not too high.
2. Try reducing the Proportional, Integral, or Differential Gains.
The axis does not finish moves or moves differently than expected
This can be caused by the P/C issuing unintended commands to the RMC. Use the Command
Log to monitor commands sent by the P/C to the RMC. Confirm that only the expected
commands are being sent.
7.2.4 Hydraulic System Problems
These hydraulic system problems can make system tuning difficult or impossible.
Nonlinear Valves
A valve is linear when the flow through it is directly proportional to the input signal over the entire
range of the input signal: