User manual

18 - UR4848 - User manual UR4848 - User manual - 19
6.3 Keys
8
• Allowstoincreasethemainsetpoint.
• Duringthecongurationphase,allowstoslidethrough
parameters. Together with the key it modies them.
• Pressedafterthe key it allows to increase the alarm
setpoint.
9
• Allowstodecreasethemainsetpoint.
• Duringthecongurationphase,allowstoslidethrough
parameters. Together with the key it modies them.
• Pressedafterthe key it allows to decrease the alarm
setpoint.
10
• Allowstodisplaythealarmsetpointandrunstheautotu-
ning function.
• Allowstovarythecongurationparameters.
7 Controller Functions
7.1 Modofying Main Setpoint and Alarm Setpoint
Values
The setpoint value can be changed by keyboard as follows:
Press Display Do
1
or
Value on display 2
changes.
Increases or decreases the
main setpoint.
2
Visualize alarm setpoint
on display 1 value being
inserted.
3
or
Value on display 2
changes.
Increases or decreases the
alarm setpoint value.
7.2 Auto-Tuning
Tuning procedure calculates the controller parameters and can be manual or automa-
tic according to selection on parameter 57 ( tunE ).
7.3 Manual Tuning
Manual procedure allows the user greater exibility to decide when to update
P.I.D. algorithm work parameters. The procedure can be activated in two ways.
• RunningTuningbykeyboard:
Press
key until display 1 shows the writing tunE with display 2 showing
off , press , display 2 shows on .
TUN led switches on and the procedure begins.
• RunningTuningbydigitalinput:
Select
tune on parameter 61 dGt.i. At rst activation of digital input (com-
mutation on front panel) TUN led switches on and at second activation
switches o.
7.4 Automatic Tuning
Automatic tuning activates when the controller is switched on or when the
setpoint is modied to a value over 35%.
To avoid an overshoot, the treshold where the controller calculates new P.I.D.
parameters is determined by the setpoint value minus the “Set Deviation Tune”
(see parameter 58
S.D.tu. ).
To exit Tuning and keep P.I.D. values unchanged, press key until display 1
shows the writing
tune and display 2 shows on . Press , display 2 shows off .
TUN led switches o and procedure nishes.