User manual

20 - UR4848 - User manual UR4848 - User manual - 21
7.5 Soft-Start
To reach the setpoint the controller can follow a gradient expressed in units
(example: Degree/Hours).
Enter the gradient on parameter 62
GrAd. with chosen Units/Hours; only on
subsequent activation the controller uses Soft-Start function.
If parameter 59
op.mo. is set on cont. and parameter 63 ma.ti. is dierent from
0, after switch-on and elapsing of the time set on parameter 63, setpoint does
not follow the gradient anymore, but it reaches nal setpoint with maximum
power.
Autotuning does not work when Soft-Start is activated: otherwise if parameter
63
ma.ti. is dierent from 0 and parameter 57 tune is set on auto , Autotuning
starts when Soft-Start time is nished.
If parameter 57
tune is set on man. , the Autotuning can be started only when
Soft-Start nishes.
7.6 Automatic / Manual Regulation for % Output
Control
This function allows to select automatic functioning or manual command of
the output percentage.
With parameter 60
Au.ma. , can select two methods.
1 First selection (
en. )
Pressing
key display 1 shows p.--- , while display 2 shows Auto .
Pressing
key display shows Man. ; it is now possible to change the output
percentage using
and . To return to automatic mode, using the same
procedure, select
Auto on display 2: led MAN switches o and functioning
returns to automatic mode.
2 Second selection (
EN.ST, )
enables the same functioning, but with two important variants:
• Ifthereisatemporarypowerfailureorafterswitch-o,themanualfunctio-
ning as well as the previous output percentage value will be maintained at
restarting.
• Ifthesensorbreaksduringautomaticfunctioning,thecontrollermovesto
manual mode while maintaining the output percentage command unchan-
ged as generated by the P.I.D. immediately before breakage.
7.7 Pre-Programmed Cycle
The pre-programmed cycle function activates by setting Pr.cy or Pc.SS. on pa-
rameter 59
oP.Mo .
Setpoint
Setpoint 2
Max.
power
Setpoint 1
Hold
Natural cooling
Time
Gradient
First selection ( Pr.cy ):
the controller reaches setpoint1
basing on the gradient set on pa-
rameter 62
Grad. , then it reaches
maximum power up to setpoint 2.
When the process reaches maximum
power, this setpoint is maintained for
the time set on parameter 63
ma.ti.
On expiry, the command output is di-
sabled and controller displays
stop .
Cycle starts at each activation of the
controller, or via digital input if it is enabled for this type of functioning (see
parameter 61
dGt.i. ).
Setpoint
Setpoint 1
Hold
Natural cooling
Time
Gradient
Second selection ( Pr.cy ):
start-up is decided only on activation
of the digital input, according to the
setting of parameter 61
dGt.i. On
start-up, controller reaches setpoint
1 following gradient set in parameter
62
Grad.
When the process reaches this gra-
dient, it is maintained for the time set
on parameter 63
ma.ti. On expiry, command output is disabled and the con-
troller displays
stop .
7.8 Programming module (optional)
Parameters and setpoint values can be duplicated from one controller to ano-
ther using the programming module.
2 modes are available:
• Withthecontrollerconnectedtothepowersupply.
Insert programming module when the controller is o.
On activation display 1 shows
memo and display 2 shows --- (only if the cor-
rect values are saved in the programming module). By pressing
key di-
splay 2 shows
Load , then conrm using key.
Controller loads the new value and restarts.