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CHAPTER 4 FUNCTIONS
4
4.18 Self-tuning Function
(8) Conditions where self-tuning does not complete due to errors
Under the following conditions, self-tuning does not complete due to errors. In addition, at this abnormal
termination, CH Self-tuning error (b10 of Un\G575, Un\G607, Un\G639, Un\G671) turns 1 (ON).
• When 6000 seconds (1 hour 40 minutes) or more have elapsed from the start of self-tuning
• When the change rate of the process value (PV) during self-tuning is less than 1.125°C/minute
• When CH Temperature process value (PV) (Un\G9 to Un\G12) is outside the temperature measurement
range ( Page 87, Section 3.4.2 (3))
• When the manipulated value (MV) does not reach the upper limit output limiter value or lower limit output
limiter value before the measurement is completed and necessary measurement data is not obtained
• When the temperature process value (PV) that is supposed to rise drops by 1°C ( ) or more after self-
tuning is started with the starting ST
• When the temperature process value (PV) that is supposed to drop rises by 1°C ( ) or more after self-
tuning is started with the starting ST
• When the setting for the buffer memory areas in the following table is changed during self-tuning
*1 Only during starting
Buffer memory area name
Buffer memory address
Reference
CH1 CH2 CH3 CH4
CH Set value (SV) setting
*1
Un\G34 Un\G66 Un\G98 Un\G130 Page 104, Section 3.4.2 (14)
CH Proportional band (P) setting Un\G35 Un\G67 Un\G99 Un\G131 Page 105, Section 3.4.2 (15)
CH Integral time (I) setting Un\G36 Un\G68 Un\G100 Un\G132 Page 107, Section 3.4.2 (16)
CH Derivative time (D) setting Un\G37 Un\G69 Un\G101 Un\G133 Page 107, Section 3.4.2 (17)
CH Upper limit output limiter Un\G42 Un\G74 Un\G106 Un\G138
Page 110, Section 3.4.2 (19)
CH Lower limit output limiter Un\G43 Un\G75 Un\G107 Un\G139
CH Output variation limiter setting Un\G44 Un\G76 Un\G108 Un\G140 Page 112, Section 3.4.2 (20)
CH Sensor correction value setting Un\G45 Un\G77 Un\G109 Un\G141 Page 113, Section 3.4.2 (21)
CH Control output cycle setting Un\G47 Un\G79 Un\G111 Un\G143 Page 114, Section 3.4.2 (23)
CH Primary delay digital filter setting Un\G48 Un\G80 Un\G112 Un\G144 Page 115, Section 3.4.2 (24)
CH AUTO/MAN mode shift Un\G50 Un\G82 Un\G114 Un\G146 Page 117, Section 3.4.2 (26)
CH Setting change rate limiter/Setting
change rate limiter (temperature rise)
Un\G52 Un\G84 Un\G116 Un\G148 Page 119, Section 3.4.2 (28)
CH Forward/reverse action setting Un\G54 Un\G86 Un\G118 Un\G150 Page 121, Section 3.4.2 (30)
CH Unused channel setting Un\G61 Un\G93 Un\G125 Un\G157 Page 126, Section 3.4.2 (35)
CH Setting change rate limiter
(temperature drop)
Un\G564 Un\G596 Un\G628 Un\G660 Page 119, Section 3.4.2 (28)