Brainchild P91 User Manual

Auto-Tuning ErrorAuto-Tuning Error
If auto-tuning fails an ATER message will appear on the upper display
in cases of :
If auto-tuning fails an ATER message will appear on the upper display
in
cases of :
Solutions toSolutions to
1. Try auto-tuning once again.
2. Don't change set point value during auto-tuning procedure.
3. Don't set zero value for PB and TI.
4. Use manual tuning instead of auto-tuning. ( See section 3-12 ).
5. Touch and key to reset message.
1. Try auto-tuning once again.
2.
Don't change set point value during auto-tuning procedure.
3.
Don't set zero value for PB and TI.
4.
Use manual tuning instead of auto-tuning. ( See section 3-12 ).
5.
Touch and key to reset message.
If PB exceeds 9000 ( 9000 PU, 900.0 F or 500.0 C ).
or if TI exceeds 3600 seconds.
or if set point is changed during auto-tuning procedure.
LL
If PB exceeds 9000 ( 9000 PU, 900.0 F or 500.0 C ).
or
if TI exceeds 3600 seconds.
or
if set point is changed during auto-tuning procedure.
LL
3 - 11 Manual Tuning3 - 11 Manual Tuning
In certain applications ( very few ) using auto-tuning to tune a process
may be inadequate for the control requirement, then you can try
manual tuning.
In certain applications ( very few ) using auto-tuning to tune a process
may
be inadequate for the control requirement, then you can try
manual
tuning.
If the control performance by using auto- tuning is still unsatisfactory,
the following rules can be applied for further adjustment of PID values :
If the control performance by using auto- tuning is still unsatisfactory,
the
following rules can be applied for further adjustment of PID values :
ADJUSTMENT SEQUENCEADJUSTMENT SEQUENCE
SYMPTOM SOLUTION
(1) Proportional Band ( PB )
(1) Proportional Band ( PB )
(2) Integral Time ( TI )(2) Integral Time ( TI )
(3) Derivative Time ( TD )(3) Derivative Time ( TD )
Slow ResponseSlow Response
High overshoot or
Oscillations
High overshoot or
Oscillations
Slow ResponseSlow Response
Slow Response or
Oscillations
Slow Response or
Oscillations
Instability or
Oscillations
Instability or
Oscillations
High OvershootHigh Overshoot
Decrease PBDecrease PB
Increase PBIncrease PB
Decrease TIDecrease TI
Increase TIIncrease TI
Decrease TDDecrease TD
Increase TDIncrease TD
Table 3.4 PID Adjustment GuideTable 3.4 PID Adjustment Guide
Figure 3.11 shows the effects of PID adjustment on process response.Figure 3.11 shows the effects of PID adjustment on process response.
UM0P411A
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Brainchild P91 Specifications

General

Brand	Brainchild
Model	P91
Category	Controller
Language	English