Unipulse F805AT-BC, Operation Manual

Page: 94 / 202

6.SETTING AND ADJUSTMENT OF READING
79
6-7-8. Start/Error display
You can force the flow value to be displayed as the target while in LOCK operation
(due to, for example, target change or abnormal flow) or during start time (while PID
control is not performed).
If you select “REAL TIME”, current feed rate value is always displayed irrespective of
the control state.
See the section of [First Stability Time] for conditions that force the system into LOCK
operation.
* If you select “TARGET” in this menu, signal feedback will never use the relation
FEED RATE = TARGET. However, target value will be output if feed rate has been
selected in BCD output, D/A output, or SI/F data output.
Operation
6-7-9. Flow stability time
Alteration of the target value during control operation will often give rise to a large
control deviation, affecting adversely later control performance. In such cases, LOCK
mode operation for a certain period of time (First stability time) can increase response
accuracy.
If a non-zero value is defined to first stability time, LOCK (fixed control) operation can
be performed during this period.
Optimum tuning of first stability time is important. If too short, the control system
tends to suffer from hunting phenomena, and if too long, very slow response.
Operation
Options: REAL TIME DISPLAY, TARGET DISPLAY
MODE CONTROL PARAMETER
→ →
PAGE START/ERROR DISPLAY
→
Range: 0 – 99 sec (2 digits, no decimal place)
MODE CONTROL PARAMETER
→ →
PAGE FLOW STABILITY TIME
→