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Carel uC2SE User Manual Page 23

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23
t
t
1
2
ON
OF
ON
OF
C2
3
t
t
1
2
C2
3
ON
OF
ON
OF
t
t
1
2
C2
3
ON
OF
ON
OF
1
2
C4
3
4
5
ON
OF
F
ON
OF
F
ON
OF
F
ON
OF
F
1
2
C5
3
4
5
ON
OF
F
ON
OF
F
ON
OF
F
ON
OF
F
t
t
1
3
C7
2
4
ON
OF
F
ON
OF
F
ENGLISH
µC
2
SE process chiller +030220416 - rel. 1.1 - 27.04.2010
• Compressor settings: parameters (c*)
- Minimum ON time
c01: This establishes the time that the compressor must remain ON for when started, even if the stop
signal is sent.
Key:
1. signal;
2. compressor;
3. min. ON time-interval.
- Minimum OFF time
c02: This establishes the time that the compressor must remain OFF for when stopped, even if the start
signal is sent. The compressor LED fl ashes in this phase.
Key:
1. signal;
2. compressor;
3. min. OFF time-interval.
- Delay between 2 starts of the compressor
c03: This sets the minimum time that must elapse between two successive starts of the same compressor
(determines the maximum number of starts per hour for the compressor). The compressor LED fl ashes in this
phase. If by mistake the user enters a value lower than the sum of C01 + C02, this parameter will be ignored and
only the times C01 and C02 will be considered.
Key:
1. signal;
2. compressor;
3. min. time-interval between two ON routins.
- Start delay between compressors
c04: This sets the delay between the starts of the two compressors, so as to reduce the peak power input
and make the compressors start more smoothly. The compressor LED fl ashes in this phase.
• In the event of capacity control, the delay c04 between compressor and valve becomes c04/2;
• In the event of defrost operation, the delay between compressor and compressor is 3 seconds, and
between compressor and valve is 2 seconds.
Key:
1. 1
st
signal;
2. 2
nd
signal;
3. 1
st
compressore;
4. 2
nd
compressor;
5. time delay between two compressors ON routines/time-delay of the capacity-controlled routine.
- Stop delay between compressors
c05: This sets the stop delay between the compressors.
Key:
1. 2
nd
signal;
2. 1
st
signal;
3. 2
nd
compressor;
4. 1
st
compressore;
5. time delay between two compressors OFF routines/time-delay before the capacity-controlled routine.
- Delay on power-up (reset power supply)
c06: At power ON (when the controller is physically switched ON) the activation of all the outputs is delayed so
as to distribute the power input and protect the compressor against repeated starts in the event of frequent power
failures. This means that after the delay time, the controller will start to manage the outputs based on the other
times and the other normal functions.
- Compressor start delay from pump/outlet fan (air/air) ON.
c07:
In cooling and heating operation, if the operation of the pump (outlet fan) is subject to the controller
(parameter H05=2), the compressor is started when required after the set time from the activation of the water
pump (or outlet fan in air/air units).
If the pump/outlet fan is always ON (H05=1) and consequently does not depend on the control logic, the
compressor is started after the set time from when the unit starts.
Key:
1. inlet fan;
2. pump;
3. compressor;
4. time-delay between pump-inlet fan and compressor.
Fig. 5.a.c
Fig. 5.a.d
Fig. 5.a.e
Fig. 5.a.f
Fig. 5.a.g
Fig. 5.a.h
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