TC310VP Instruction Manual
Powtier Controls Limited
TUNING
PID CONTROL TUNING PROCEDURE
1. Set P13 and P14 fully counter clockwise.
2. Set proportional band to minimum (P1 fully anticlockwise).
3. Set all SID switches to ’ON’ (11111111).
4. Adjust the setpoint to 10% below working temperature.
N.B. If it is undesirable for the system to overshoot the working temperature, perform the test at a further
reduced temperature.
5. Observe:-
a. Time (to) taken for the measured temperature to rise from the setpoint to a maximum.
b. Overshoot temperature (To) = maximum temperature - setpoint temperature.
6. Set the SID switches (see Table 1) to give ti = 4 x to. This will automatically set td = ti/9.
7. From the overshoot temperature, To, calculate the proportional band index PBI as follows:-
PBI = (To / TR) x 100
TR = 200 for -50 to 200 range
TR = 500 for -50 to 500 range
TR = 1000 for 0 to 999 range
and set the proportional band according to table 2.
8. Progressively reset P13 & P14 as far clockwise as possible without the introduction of system hunting.
Table 1. Switch settings for integral and derivative time constant.
SID
ti
td
SID
ti
td
12345678
(minute)
(minute)
12345678
(minute)
(minute)
00000000
50
5.5
10001000
23
2.6
00010001
46
5.2
10011001
20
2.2
00100010
43
4.8
10101010
17
1.9
00110011
40
4.4
10111011
13
1.5
01000100
36.5
4.1
11001100
10
1.1
01010101
33
3.7
11011101
7
0.8
01100110
30
3.3
11101110
3
0.4
01110111
27
3.0
11111111
ON/OFF
CONTROL
(For SID switch, 0 - off, 1 – on)
Table 2. Proportional band index.
P1 MARKING
PBI
P1 MARKING
PBI
P1 MARKING
PBI
0
1
4
8.9 – 11.5
8
19.6 – 22.3
1
1 – 3.5
5
11.5 – 14.2
9
22.3 – 25.0
2
3.5 – 6.2
6
14.2 – 17.0
10
25
3
6.2 – 8.9
7
17.0 – 19.6
PD CONTROL (OPTIONAL) TUNING PROCEDURE
1. Turn the manual reset to minimum (P3 fully anticlockwise).
2. Proceed as for PID control tuning procedure, use table 1 to set SID to give td = 0.5 x to.
3. Turn P3 anticlockwise to eliminate any steady state error.
ON-OFF CONTROL (OPTIONAL) TUNING PROCEDURE
No adjustment is required for ON-OFF control.
14 March 1995
- 5 -
310VPIM
Issue 2.0
