E L C O p e r a t i o n M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003006E
1-168
C R # 1 2 1 , 1 4 1 , 1 6 1 , 1 8 1 :
Sampling time (s)
1. Set up the time interval between each sample. If the temperature in the control
environment does not vary significantly, use a longer sampling time; however if
temperature varies changes often, use a shorter sampling time.
2. Range: 1 ~ 30, Default =K2. The conversion time for each channel in the temperature
measurement module is approximately 1 second. Therefore, if the value is set smaller
than 1, 1 will be written into the CR. If the value is larger than 30, 30 will be written into
the CR.
3. Output cycle time (ms) is equal to the setup sampling time (s), i.e. if the sampling time is
set as 2, the output cycle will be 2,000.
C R # 1 2 2 , 1 4 2 , 1 6 2 , 1 8 2 :
K
P
value, Default =K121
K
P
: The proportional control constant, i.e. proportional band. The proportional control refers
to the output being proportional to the error. Refer to the PID operation formula.
Output MV (%) = E / K
P
× 100%
MV
: Output value
P
K
: Proprotional gain
( )
t
E
: Error value
Example:
Set up K
P
= 10, E = 1, K
I
= 0, K
D
= 0 (Close K
I
, K
D
)
MV (%) = 1 / 10 × 100% = 10%
The output percentage displayed in CR#131, 151, 171, 191 will be 10%.
C R # 1 2 3 , 1 4 3 , 1 6 3 , 1 8 3 :
K
I
value, Default = K2098
K
I
: Integral constant.
1. If only proportional control is applied, there will be certain deviations between the set
value and the actual temperature. If integral control is applied, the deviation will decrease
gradually and the target temperature can be achieved.
2. Integral control function will be disabled if K0 is written to the CRs.
3. If the curve is too gradual, adjust K
I
. The closer K
I
is to 0, the more abrupt the curve
becomes.
C R # 1 2 4 , 1 4 4 , 1 6 4 , 1 8 4 :
K
D
value, Default = K-29
K
D
: Derivative constant.
1. Derivative control enhances disturbance rejection and helps the control status get back
to the target temperature quickly.
