Carel ir33 Universale series User Manual page 31

Par. Description
c12 PWM cycle time
Validity: c0=4;
In special operation c12
is active in any mode if "type of output"=1
ON
OFF
ton
Key:
t Time
As the action of PWM operation is modulating, PID control can be fully
exploited, so that the value coincided with the set point or falls inside the
dead zone.
The minimum on time (ton) calculable and the maximum defi nition
achievable for ton is 1/100 of c12(1%).
5.7.7 0 to 10 Vdc analogue outputs
When the application requires one or more 0 to 10 Vdc analogue outputs,
the following controllers should be used:
IR33B7**** (1 relay + 1 x 0 to 10Vdc)
IR33E7**** (2 relays + 2 x 0 to 10Vdc)
DN33B7**** (1 relay + 1 x 0 to 10Vdc)
DN33E7**** (2 relays + 2 x 0 to 10Vdc)
In this case too, the system operates with a voltage that ramps from 0 to
10 Vdc.
5.7.8 Analogue inputs
See the start of the chapter, under the paragraph on "Probes".
5.7.9 Digital inputs
Parameter c29 establishes the function of digital input 1 if not already used
in modes 6, 7 and 8 or in special operation (c33=1) with "dependence"=16
and 17. When set as an alarm input, that is, c29=1,2,3, one or more alarm
outputs are activated according to the mode used (see mode 5), while
the action on the control outputs is defi ned by c31 (see the chapter on
"Alarms"). Parameter c30 has a similar meaning to c29 and refers to digital
input 2.
Par. Description
c29 Digital input 1
0= Input not active
1= Immediate external alarm,
Automatic reset
2=Immediate external alarm,
Manual reset
3= Delayed external alarm (P28),
Manual reset
4= Control ON/OFF in relation to status
of digital input
5= Start/stop operating cycle
from button
Validity: c0 other than 6,7,8 & if c33=1 with
"dependence"=16 & 17
c30 Digital input 2
See c29
Def Min Max UM
20 0.2 999 s
t
toff
c12
Def Min Max UM
0 0 5 -
0 0 5 -
c29=0 Input not active
c29=1 Immediate external alarm with automatic reset.
The alarm condition relates to the contact being open. When the alarm
condition ceases (contact closes), normal control resumes and any alarm
output is deactivated.
c29=2 Immediate external alarm with manual reset.
The alarm condition relates to the contact being open. When the alarm
condition ceases (contact closes), normal control does not resume
automatically, and the audible signal, the alarm code E03 and any alarm
output remain active. Control can start again only after a manual reset,
that is, after pressing Prg/mute and UP together for 5 seconds.
c29=3 External delayed alarm (delay = P28) with manual reset.
The alarm condition occurs when the contact remains open for a time
greater than P28. Once alarm E03 is activated, if the alarm condition
ceases (contact closes), normal control does not resume automatically,
and the audible signal, the alarm code E03 and any alarm output remain
active. Control can start again only after pressing Prg/mute and UP
together for 5 seconds.
c29=4 ON/OFF
The digital input establishes the status of the unit:
- with the digital input closed, the controller is ON.
- when the digital input is open the controller is OFF. The consequences
of switching OFF are:
•
the display shows the message OFF, alternating with the value of
the probe and any alarm codes (E01/E02/E06/E07/E08) active before
switching off ;
•
the control outputs are deactivated (OFF), while observing any
minimum on time (c9)
•
the buzzer, if active, is muted;
•
the alarm outputs, if active, are deactivated
•
any new alarms that arise in this status are not signalled, except for
(E01/E02/E06/E07/E08).
c29=5 Start operating cycle.
To start the operating cycle from the button, P70 must be =2 and P29 =5
for digital input 1 and P70=3 and c30=5 for digital input 2.
Parameter c29 is not operative when c0=6, 7, 8, or in special operation
(c33=1) when "dependence"=16 and 17. These operating modes in fact
exploit digital input 1 to switch the set point and/or the operating logic,
therefore any change to the value of this parameter has no aff ect.
31 ir33 universale +030220801 - rel. 1.0 - 16.04.2008
ENG