Pixsys ATR 171, Руководство пользователя

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User manual - ATR171 17
8 Controller functions
8.1 Modification of main and alarm setpoint value
Setpoint value can be modified from keyboard as follows:
1


Value on display 2 changes
Increase or decrease main
setpoint value
2 SET
Visualizes alarm setpoint on display
1
3


Value on display 2 changes
Increase or decrease alarm
setpoint value
8.2 Auto-tuning
Tuning procedure to calculate regulation parameters can be manual or automatic
and selected from parameter 24
tune
.
8.3 Manual Tuning
Manual procedure allows user more flexibility on deciding when to update
regulation parameters of P.I.D. algorithm.
Press
FNC key until display 1 visualizes writing
tune
and display 2 visualizes
oFF
.
Pressing

display 2 visualizes
on
. Led TUN switches on and procedure starts.
8.4 Automatic Tuning
Automatic tuning starts when the controller is switched-on or when setpoint value
has been modified over 35%. To avoid overshooting, the threshold where controller
calculates new P.I.D. parameters is determinated by setpoint value minus “Set
Deviation Tune” value (see parameter 25
s.d.tu.
).
To interrupt Tuning keeping the P.I.D. values unchanged, press key FNC until
display 1 visualizes writing
tune
and display 2 visualizes
on
. Pressing

, display 2
visualizes
oFF
, led
TUN
switchs off and procedure ends.
Setting
once
on parameter 24
tune
autotuning procedure starts only once when
instrument is switched on: after calculating P.I.D. parameters parameter 24
tune
returns to
dis.
.
8.5 Automatic / manual regulation of % control output
This function allows to switch from automatic functioning to manual control of
output porcentage.
With parameter 71
au.ma.
, it is possible to select two modes.
1 The first selection (
en.
): pressing key FNC display 1 visualizes writing
p.---
,
while display 2 visualizes
auto
. Press

to select manual mode
man.
. With

and

change output percentage. To return to automatic mode with the same
procedure, select
auto
on display 2: led MAN switches on and operation returns
to automatic mode.
2 The second selection (
en.st.
): enables the same functioning, but with two
important variants: