User manual

24 - UR4848 - User manual UR4848 - User manual - 25
Press Display Do
2
Set the value on mini-
mum. Display shows Low .
Place the sensor on
maximum operating value
(associated with upL.i. ).
3
Set the value to maximum.
The display shows HiGH .
To exit standard procedure
press . For “virtual zero”
settings place the sensor
on the zero point.
4
Set the virtual zero value.
Display shows uirt .
NB: For selection of u.0in.
the procedure in point
4 should be followed on
each re-activation.
To exit procedure press
.
Max
Min Zero
7.11 LoopBreakAlarmOnCurrentTrasformer
This function allows to measure load current and to manage an alarm during
malfunctioning (with power in short circuit or always o).
The current transformer connected to terminals 15 and 16 must be 50 mA (sam-
pling time 80 ms).
• SetendscalevalueofthecurrenttransformerinAmperesonparameter47
t.a.
• SettheinterventionthresholdoftheLoopBreakAlarminAmperesonpara-
meter 48
L.b.a.t.
• Set theinterventiondelaytimeofthe Loop BreakAlarm onparameter 49
L.b.a.d.
• Itispossibletoassociatethealarmwitharelaybysettingtheparameter AL.
1
, AL. 2 or AL. 3 as AL. 4.
If a remote control switch or SSR remains closed, controller signals the fault
by showing
L.b.a.c. on display 2 (alternatively with a command setpoint).
If the power stage remains open, or the load current is lower than the value
set on
L.b.a.t. , controller shows L.b.a.o. on display. It is possible to display the
current absorbed during the closure phase of the power stage.
Press Display Do
1
This key enables to scroll
on display 2 the output
percentage, auto / man
selection, setpoint and
alarms.
Press
until the writing
am.t.a. appears on display
1 and display 2 shows the
current in amperes ( t.a.
>0).
The value is also main-
tained when no current
circulates on the load.
Setting on parameter 48 L.b.A.t. the value 0 it is possible to visualize the current
absorbed without generating the Loop Break Alarm.
7.12 Digital Imput Functions
On UR4848 model, digital input can be enabled by using parameters 59 op.mo.
and 61
dGt.i.
• Parameter59 op.mo.
NB: When using this settings, parameter 61 dGt.i. is ignored.
2t.s. : Switch two thresholds setpoint: with open contact UR4848 regulates
on SET1; with closed contact regulates on SET2;
2t.s.i. : Switch two thresholds setpoint: setpoint selection is done by an im-
pulse on digital input;
3t.s.i. : Switch three thresholds setpoint by an impulse on digital input;
4t.s.i : Switch four thresholds setpoint by an impulse on digital input;
t.res. : Customized function;
p.c.s.s. : Pre-programmed cycle (see paragraph 7.7).
Setpoints values can be modied any time pressing
key.
• Parameter61 dGt.i.
NB: Settings on this parameter are available only if cont. or pr.cY. are se-
lected on parameter 59
op.mo.
st.st.
: Start / Stop; operating on digital input the controller switches alterna-
tively from start to stop;
rn.n.o. : Run N.O. Controller is in start only with closed input;
rn.n.c. : Run N.C. Controller is in start only with open input;
L.c.n.o. : With closed input allows to lock the reading of sensors;