12
Modular Temperature Controller for Gradient Temperature Control
EJ1G
The HFU can control up to 64 channels, but when the maximum
number of enabled channels is a number other than 4, 8, 16, or 32
channels, non-usable channels result as shown in this example. This
limits the number of controllable channels and connectable Units.
The example used here results in the following group division and heater connection.
Note:
The connections for heater blocks 2 and 3 are omitted above.
■
Gradient Temperature Control
Operations
The HFU handles all of the operations for gradient temperature
control.
The temperature input is received by the Basic Units (TC2 or TC4),
calculated by the HFU, and then output from the Basic Units (TC2 or
TC4) as manipulated variables.
General Flow of Gradient Operations
■
Arrangement of Gradient
Temperature Control Sensors
Arrange the sensors sequentially to maximize the control
performance within the gradient temperature control groups.
Examples for linear arrangement of
heaters
Examples for planar arrangement of
heaters
HFU channels
Groups
1
1
2
3
4
Not usable
5
2
6
7
8
Not usable
9
3
10
11
12
Not usable
13
4
14
15
16
Not usable
0
HFU
1
CH1
2
CH3
3
CH6
4
CH9
5
CH11
6
CH14
CH2 CH5 CH7 CH10 CH13 CH15
TC2 TC2 TC2 TC2 TC2 TC2
EDU
CH15
Heater block 3
CH9 CH10 CH11
CH14
Heater block 2
CH13
Heater block 1
CH1 CH2 CH3
CH5 CH6 CH7
HFU
TC2 TC2 TC2 TC2
Sensor input
Output manipulated variables
TC2 TC2 EDU
Gr
adient
calculation
1CH 2CH 3CH 4CH 5CH
1CH 3CH 5CH 4CH 2CH
Good example
Bad example
3CH
5CH
2CH
7CH
9CH
8CH
1CH
4CH
6CH
7CH
8CH
9CH
6CH
1CH
2CH
5CH
4CH
3CH
Good example
Bad example
