Delta RMC101 User Manual download pdf (Page 627)

100

101

Troubleshooting 7.2

Support and Troubleshooting 7-3

It is nonlinear when the output is not directly proportional to the input. You may find two types of

valve non-linearity:

Overlapped valves - Oil does not start to flow through these valves until the spool has moved

some distance. This causes a dead band in the system, where small amounts of drive do not

produce motion. Overlapped valves are designed for manual and on/off type control and are not

suited for servo control. These valves should be replaced with non-overlapped valves.

Curvilinear valves - The flow through these valves increases slowly as the input signal increases

for the first 20% of range. Beyond 20% the flow increases rapidly as the input increases. This is

equivalent to having two different gains for different signal levels. The low gain at low flow causes

poor response at slow speeds, and the high gain at high speed can cause instability. These

problems are more pronounced when heavy loads are moved by relatively small cylinders.

Slow-Response Valves

Valves with slow response cause the RMC to overcompensate for disturbances in the motion of

the system. Since the system does not respond immediately to the control signal, the RMC

continues to increase the drive signal. By the time the system begins to respond to the error, the

control signal has become too large and the system overshoots. The RMC then attempts to

control in the opposite direction, but again it overshoots. These valves can cause the system to

1 2 ... 622 623 624 625 626 627 628 629 630 631 632 ... 950 951

Comments to this Manuals

No comments

Delta RMC101 User Manual Page 627

Comments to this Manuals

Related products and manuals for Sensors Delta RMC101