Pixsys ATR244, Быстрый старт, Страница: 15 / 148

User manual - ATR244 - 15
8.4 Tuning once
Set
once
on parameter 73
tun.1
, or on parameter 98
tun.2
.
Autotuning procedure is executed only once at next ATR244 restart. If the procedure doesn’t work, will
be executed at next restart.
8.5 Synchronized tuning
Set
sYNch.
on parameter 73
tun.1
or on parameter 98
tun.2
.
This procedure has been conceived to calculate correct PID values on multi-zone systems, where each
temperature is influenced by the adjacent zones.
Writing on word modbus 1216 (for regulation loop 1) or 1217 (for regulation loop 2) the controller
works as follows:
Word value Action
0 Tune off
1 Command output OFF
2 Command output ON
3 Tune active
4 Tune completed: command output OFF (read only)
5 Tune not available: softstart function enabled (only reading)
Here below the functioning for regulation loop 1: the master switches-off or turns-on all zones (value
1 or 2 on word 1216) for a time long enough to create inertia on the system.
At this point the autotuning is launched (value 3 on word 1216). The controller executes the procedure
for the calculation of the new PID values. When the procedure ends, the controller switches off the
command output and selects the value 4 on word 1216. The master, who will always read the word
1216, will control the various zones and when all will have finished, will bring to 0 the value of word
1216: the various devices will regulate the temperature independently, with the new calculated values.
N.B. The master must read the Index 0x400E at least every 10 seconds or the controller will automatically
exit the autotuning procedure.
8.6 Digital input functions
The ATR244 functions related to digital inputs, can be enabled by parameters 231
d.i.1.F.
, 239
d.i.2.F.
, 247
d.i.3.F.
and 255
d.i.4.F.
.
•
2t.Sw.
: Two threshold setpoint modification: with digital input active the ATR244 regulates on SET 2,
otherwise reulates on SET 1;
•
2t.Sw.i.
: Modification of 2 setpoints by digital input with impulse command;
•
3t.Sw.i.
: Modification of 3 setpoints by digital input with impulse command,
•
4t.Sw.i.
: Modification of 4 setpoints by digital input with impulse command,
•
st./St.
: Start / Stop of the controller by digital input with impulse command,
•
run.
: The regulation is enabled only with digital input active,
•
HoLd
: With digital input active the conversion is locked (visualization maintenance function);
•
tune
: Enables/disables the Tuning if par. 73
tun.1
or par. 98
tun.2
is selected as
manu.
;
•
au.ma.i.
: If par. 48
a.ma.1.
or par. 67
a.ma.2.
is selected as
enab.
or
en.sto.
, with impulse command on
digital input, the ATR244 switches the related regulation loop, from automatic to manual and vice
versa.
•
au.ma.c.
: If par. 48
a.ma.1.
or par. 67
a.ma.2.
is selected as
enab.
or
en.sto.
the ATR244 switches to manual
the related regulation loop, with digital input active, otherwise the regulation is automatic.
•
Act.ty.
: On the regulation loop selected for this function (par. 234
d.i.1.r.
or 242
d.i.2.r.
or 250
d.i.3.r.
or 258
d.i.4.r.
), the ATR244 execute a cooling type regulation with digital input active, otherwise the
regulation is of heating type;
•
A.i. 0
: Zero tare function: brings the related analogue input to 0. The analogue input is selected on
par. 233
d.i.1.p.
or 241
d.i.2.p.
or 249
d.i.3.p.
or 257
d.i.4.p.
•
M.reS.
: Allows the reset of the output if manual reset is active for the alarms and for the command
outputs selected on par. 234
d.i.1.r.
or 242
d.i.2.r.
or 250
d.i.3.r.
or 258
d.i.4.r.
;
•
t.1.run
: If timer 1 is enabled (par. 328
tmr.1
different from
disab.
), with digital input active, the timer is