Pixsys DRR460 Series, User Manual, Page: 11 / 72

User manual - DRR460 - 11
6.3 Dip switch
1
ON
2
3
4
5
6
7
8
DIP 1 – Slave address
• If contacts 1..8 are OFF, modbus slave address is selected on parameter 111
sL.ad.
• Determines modbus slave address, in binary code as indicated below:
00000001=1; 00000010=2; 00000011=3; 00000100=4; 00000101=5;
00000110=6; 00000111=7; 01111101=125; 01111110=126; 01111111=127;
10000000=128; 10000001=129; 10000010=130; 11111011=251;
11111100=252; 11111101=253; 11111110=254.
1
ON
2
3
4
DIP 2 - Baud rate and loading default values
• If contacts 1..3 are OFF, modbus baud rate is selected on parameter 112
bd.rt.
• If contact 4 is ON, parameters and all eeprom datas are loaded with
default values (default).
• Determines modbus baud rate, using following values:
001=4800; 010=9600; 011=19200; 100=28800; 101=38400; 110=57600;
111=115200.
7 Controller functions
7.1 Loading default values
This procedure allows to restore default settings as pre-selected at the factory.
There are two reset modes:
• Close contact 4 of the dip switch 2 and reopen it at restart.
• Write 9999 on word modbus 500.
After the restore, device restarts.
7.2 Controller Start / Stop and setpoint modification
User can decide if at power-on DRR460 starts regulation or not, setting parameter 17
init.S.
(word
2017). Can modify the controller state writing 1 (start) or 0 (stop) on word 1204. It is possibile also to
modify command setpoint writing on word 1201, and alarm setpoints on words 1202 and 1203.
7.3 Automatic tuning
Select 1 on parameter 31 (
Tune
word 2031).
Automatic tuning is always active and analyses constantly the difference setpoint-process. If this
difference is greater than the value selected on parameter 47
m.G.tu.
(Max Gap Tune - word 2047), the
DRR460 decides autonomously when to modify PID parameters.
7.4 Manual tuning
Select 2 on parameter 31 (
Tune
word 2031).
The manual procedure allows the user a greater flexibility on deciding when to update PID algorithm
parameters.
This procedure is activated writing 1 on the word modbus 1205. The reference threshold to calculate
the new PID parameters is given by the result of the following operation:
Tune threshold = Setpoint (word 1201) – Par. 32
s.d.tu.
(word 2032)
Ex.: if setpoint is 100.0°C and Par. 32
s.d.tu.
is 20.0°C, the threshold to calculate PID parameters is
(100.0–20.0) = 80.0°C.
N.B.: for greater accuracy in the calculation of PID parameters it is recommended to launch the manual
tuning when the process is far from setpoint.