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PID AUTO-TUNING
Press key for 6 sec to start/stop
PID auto-tuning
°C
PV
Tuning
LED Indication
SV
Auto Tuning:-
The Auto-tuning function automatically computes
and sets the Proportional band (Pb) , Integral time (It),
Derivative time (dt), and cycle time as per process
characteristics.
Tuning LED will turn “ON” during Auto-Tuning
If the power goes off before auto-tuning is completed,
auto-tuning will be restarted at next power ON.
88
99
8
100
8
45
PARAMETER RANGE
Parameter
Range For J, K
PB
0.0°C to 999.9°C
IT
0 to 9999
DT
0 to 9999
CT
4 sec to 99 sec
MR
-9 to +9
2°C to 20°C
Hysteresis-1
1°C To 100°C
0.0 to 30.0A
0.0 to 30.0A
0.0 to 30.0A
-9°C to 9°C
Hysteresis-3
0 Sec to 99 Sec
1°C to 50°C
1°C to 100°C
-20°C to 20°C
Hysteresis-2
4°C to 99°C
Pb2
Ct2
Mr2
Alarm Time
Set 2
Offset
HBAL/HBI H1
HBAL/HBI H2
HBAL/HBI H3
WORKING
2) Control Mode ON/OFF: Relay turns ON (and remains ON) when
PV < SV. Relay turns OFF when PV > SV. After this there may be
overshoot depending on the thermal inertia of the machine.
When the PV < SV Minus HYS, Relay turns ON and heating is
resumed.
1) Control Mode PID: Relay turning ON/OFF according to heat
requirement of the machine.
R1-Heating
R2-Cooling
1) Cooling Time proportional Control action: Relay turns ON/OFF
as per et Cycle timeand difference between PV and cooling SV.
2) Cooling ON/OFF control action: Relay is initially OFF. When
PV > SV, Relay turns ON and when PV < SV Minus HYS relay
turns OFF.
Set 3
Set 3 Low
Set 3 High
1°C to 30°C
R3MD = CS
R3MD = HIG/
ABL
S3MD = RLT
S3MD = IND
S3MD = RLT
S3MD = IND
-50 to 0
0 to set 1
-50 to +50
SLL to SHL
SLL To SET3 HIGH
SET3 LOW To SHL
