Parker Products COMPAX-M /-S (L) - Manual (Page 132)

Operating Instructions COMPAX-M / -S
Speed monitor
132
8.5.2 Speed monitor
In COMPAX the drive speed is required as an actual value for speed control (loop
underlying the position control).
The actual speed value is derived by differentiating the position signal.
In certain applications, such as with large ratios J
load
/J
motor
, the loop response time
is limited by quantization noise.
COMPAX includes a speed monitor for determining speed, which can be turned on
using parameter P50.
Use the speed monitor to set a higher level of stiffness corresponding to a faster
control process.
The monitor reproduces the dynamic behavior of the drive. It receives the same
input signal as the physical drive. An additional loop is used to compare the output
magnitude with the actual output magnitude of the drive (actual position value from
resolver) and hold it at the same value. This additional loop makes corrections to
the internal monitor values.
The advantage is that the speed is available directly as an intermediate value of
the monitor and can be used for speed control.
Use this speed signal to attain a stable control process or to operate the drive
control process with higher levels of stiffness (P23) and the same levels of
damping.
P50=100: without monitor (default setting and function as before)
P50=101: with monitor
P151: responsiveness of the monitor control (standard 30%)
P151>30%: monitor loop becomes faster
P151<30%: monitor loop becomes slower
• For large ratios J
load
/J
motor
.
Note! Do not use the speed monitor when operating
asynchronous motors.
Speed
determination
standard:
Speed monitor:
Function:
Settings:
Using the speed
monitor