Parker Products COMPAX-M /-S (L) manual Speed monitor, Speed determination standard

Operating Instructions	COMPAX-M / -S
Speed monitor
8.5.2 Speed monitor

Speed determination standard:

Speed monitor:

Function:

Settings:

Using the 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 Jload/Jmotor, 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 Jload/Jmotor.

Note! Do not use the speed monitor when operating asynchronous motors.

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