Outputs And Inputs - Carel ir33 Universale series User Manual

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Modes 1 & 2 in diff erential operation (c19=1).
In diff erential operation, St1 must compare against 'B1-B2' instead of B1.
In special operation (c33=1) the outputs can be set with "dependence"=2:
diff erential operation is therefore overridden and the outputs are linked
to St2/P2 compared against B1.
Setting "dependence"=3, 4 to 14 obtains an alarm output: the "High" (Er4)
and "Low" (Er5) alarms always refer to the main probe B1.
Modes 1 & 2 with "compensation" (operation c19=2, 3, 4).
Similarly to the above, when c33=1 the outputs with "dependence" 2 will
be linked to St2/P2; control is based on B1 without compensation using
probe B2.
Setting "dependence"=3, 4 to 14 obtains an alarm output using the main
probe B1.

5.7 Outputs and inputs

5.7.1 Relay digital outputs (par. c6,c7,d1,c8,c9,c11)
The parameters in question concern the minimum on or off times of the
same output or diff erent outputs, so as to protect the loads and avoid
swings in control.
For the times set to become immediately operational, the controller
needs to be switched off and on again. Otherwise, the timers will become
operational when the controller is next used, when the internal timer is
set.
5.7.2 Relay output protector (parameters c7,c8,c9)
Par. Description
c7 Minimum time between activations
of the same relay output
Validity: c0 ≠ 4
c8 Minimum relay output off time
Validity: c0≠ 4
c9 Minimum relay output on time
Validity: c0 ≠ 4
•
c9 defi nes the minimum time the output is activated, regardless of the
request.
•
c8 defi nes the minimum time the output is deactivated, regardless of
the request
•
c7 establishes the minimum time between two following activations
of the same output.
c7,c8 & c9 are not operative for the PWM outputs.
5.7.3 Other relay output protectors (parameters c6,d1)
Par. Description
c6 Delay between activations of 2
diff erent relay outputs
Validity: c0 ≠ 4
d1 Minimum time between
deactivations of 2 diff erent relay
outputs
Validity: c0≠ 4
•
c6 establishes the minimum time that must elapse between successive
activations of two diff erent relay outputs. Activation is delayed to avoid
overloads on the line due to starting devices too close together or
simultaneously.
•
d1 establishes the minimum time that must elapse between
deactivations of two diff erent outputs.
c9
ON
OUT1
OFF
ON
OUT2
OFF
c6
ir33 universale +030220801 - rel. 1.0 - 16.04.2008
Def Min Max UoM
0 0 15 min
0 0 15 min
0 0 15 min
Def Min Max UoM
5 0 255 s
0 0 255 s
c7
c8
t
d1
Key
t
c6 & d1 are not operative for the PWM outputs.
5.7.4 Rotation (parameter c11)
This allows the control outputs to change activation and deactivation
priority: based on the requests dictated by the controller, the output that
has been active longest is deactivated, or the output that has been off
longest is activated.
Par. Description
c11 Output rotation
0=Rotation not active
1=Standard rotation (on 2 or 4 relays)
2=Rotation 2+2
3=Rotation 2+2 (COPELAND)
4=Rotation of outputs 3 & 4, not 1 & 2
5=Rotation of outputs 1 & 2, not 3 & 4
6=Separate rotation
(between each other) and 3,4
7= Rotation of outputs 2,3,4, not 1
Validity : c0=1,2,7,8 & c33=0
Rotation 2+2 on 4 outputs (c11=2) has been designed to manage capacity-
controlled compressors. Outputs 1 and 3 activate the compressors, outputs
2 and 4 the capacity control valves. Rotation occurs between outputs 1 and
3, while the valves are energised (relays ON) to allow the operation of the
compressors at maximum capacity. Valve 2 is linked to output 1 and valve
4 to output 3.
The rotation 2+2 DWM Copeland on 4 outputs (c11=3) is similar to the
previous rotation, with the opposite logic for managing the valves. The
valves are in fact normally energised (capacity controlled compressor) and
are de-energised (relays OFF) when the compressor needs to operate at full
power. A normal activation sequence is:
1 off , 2 off , 3 off , 4 off
1 on, 2 on, 3 off , 4 off
1 on, 2 off , 3 off , 4 off
1 on, 2 off , 3 on, 4 on
1 on, 2 off , 3 on, 4 off
As before, in this case too outputs 1 and 3 control the compressors,
outputs 2 and 4 the corresponding solenoid valves.
The parameter has no eff ect on controllers with 1 output.
In the models with two outputs(W), rotation is standard even when
c11=2 or 3;
The connection in the 2+2 confi guration is as follows: OUT1 = Comp. 1,
OUT2 = Valve 1, OUT3 = Comp. 2, OUT4 = Valve 2.
Pay careful attention when programming the parameters, as the controller
rotates the outputs according to the logic described above, regardless of
whether these are control outputs (PWM) or alarm outputs.
Example a: if there are two alarm and two control outputs, rotation must
be set so as to only rotate the control outputs.
Example b: to control a chiller with three compressors, rotation mode 7
can be set, reserving outputs 2, 3 & 4 for the compressors, while output 1
can be unconnected or used as an auxiliary output or alarm output.
5.7.5 SSR (solid state relay) digital outputs
When control is required using on one or more PWM outputs, the solution
with relays becomes impractical if the changeover times are not quite
high (at least 20 seconds), otherwise the life of the relays will be reduced.
In these cases, solid state relays (SSR) can be used, managed according to
the specifi c application.
5.7.6 PWM cycle time (parameter c12)
This represents the total time of the PWM cycle; in fact, the sum of the
on time (tON) and the off time (tOFF) is constant and equal to c12. The
ratio between ton and toff is established by the control error, that is, the
deviation from the set point, referred (as a percentage) to the diff erential
linked to the output. For further details, see mode 4.
30
Time
Def Min Max UM
0 0 7
of pairs 1,2
-