73
Setting Control Specifications
Section 5-3
Note
(1) This parameter can be set only when operation is stopped.
(2) The function is stopped if this parameter is set to 0. The unit is determined
by the setting of the SP Ramp Time Unit parameter.
Refer to 5-7-1 Bank Function for details on banks.
The decimal point position is the same as set for the Decimal Point Posi-
tion B parameter.
Note
Refer to 5-4-7 Alarm SP Selection for details on alarms during SP
ramp operation.
Operation at Startup
If the SP ramp function is enabled when the Controller is turned ON or
switched from STOP to RUN mode, the process value may reach the set point
using the SP ramp function in the same way as changing the set point. In this
case, operation is carried out with the process value regarded as the set point
before the change was made.
SP ramp operation at startup depends on the relationship between the pro-
cess value and the set point, as shown in the following diagrams.
When performing gradient temperature control, the following procedure is
used to determine the start point for the SP ramp.
1.
The channel in the group with the largest deviation (difference between SP
and PV) is found.
2.
The PV for the channel with the largest deviation is used as the start point
for the SP ramp.
3.
For all other channels, the difference is found between that channel’s SP
and the SP for the channel with the largest deviation. The start point for the
SP ramp is the start point for the channel with the largest deviation plus this
difference.
Example 1
Example 2
Operation Example using Example 1 Values
PV < SP
Time
SP
Rising
SP ramp
Power ON
SP
Process
value
PV > SP
Time
SP
Falling
SP ramp
Power ON
Process
value
SP
CH
SP
PS
Deviation
SP set value
SP ramp start
point
1
150
25
125
0 (=150-150)
18 (=18+0)
2
150
21
129
0 (=150-150)
18 (=18+0)
3
150
18
132 (max.)
0 (=150-150)
18 (=18+0)
CH
SP
PS
Deviation
SP set value
SP ramp start
point
1
110
105
5
-5 (=110-115)
95 (=100-5)
2
115
100
15 (max.)
0 (=115-115)
100 (=100-0)
3
120
130
−
10
5 (=120-115)
105 (=100+5)
Summary of Contents for EJ1G
Page 3: ...iv ...
Page 17: ...xviii ...
Page 21: ...xxii ...
Page 53: ...32 Unit Configuration Examples Section 2 4 ...
Page 69: ...48 Changing SPs During Operation Section 3 3 ...
Page 81: ...60 Other Functions Section 4 5 ...
Page 145: ...124 Other HFU Functions Section 5 7 ...
Page 167: ...146 Detailed Description of Services Section 6 4 ...
Page 229: ...208 Parameters That Can Be Allocated for Programless Communications Appendix ...
Page 237: ......