1454H502 Ed.03
WITH FREQUENCY CONVERTER
Operation is the same as in the previous point, but modulating the power of the fans with the converter while it remains
in the neutral zone using a
PID
control.
Near the upper limit, the fans operate at their maximum capacity, and if said limit is exceeded, the capacity is kept at its
maximum until returning to the neutral zone.
Near the lower limit, the fans operate at their minimum capacity, and if said limit is exceeded, they stop until returning
to the neutral zone, upon which they activate again at their minimum capacity.
7.3.- Floating condensation
The controller modulates the evaporation Set Point taking into account the ambient temperature (requiring
connecting probe 3) and the power of the compressors.
This type of control improves the COP (the relationship between cooling power and consumed electrical energy)
and hence increases the energy performance of the installation.
This mode is only valid if the fans of the condenser are controlled, with or without a frequency converter.
7.4- Alarms
IMPORTANT:
The alarms that cause compressors and fans to stop will do so in a sequential manner,
with a delay of 5 seconds between stops.
LOW AND HIGH PRESSURE ALARM DUE TO DIGITAL INPUT
When the digital input I5 or I6 is activated, the message HPA (High) or LPA (Low) is shown on
screen, the alarm relay is activated (if available) and the compressors are stopped.
If the alarm is due to
low pressure
, the fans stop; if it is due to
high pressure
, the fans activate
regardless of parameter
F07
.
If the cause that triggered the alarm disappears, the installation returns to its standard operation.
Parameter
A09
defines the number of
high-pressure alarms allowed per hour.
If this value is
exceeded, the unit must be manually reset by pressing the
Q
key in order for it to return to its
standard operation, once the cause that triggered the alarm has disappeared.
This requires the parameters
I07
or
I08
to be set to 0 or 1.
When the readings return to their normal values, the alarm relay deactivates but the
R
indicator remains on until
the
Q
key is pressed.
Upper limit
SP+E06
Pres / Temp (Probe 2)
Converter status
NEUTRAL
ZONE
Upper limit
SP-E06
Time
SP
100 %
100 %
0 %
OFF
(R1 OFF)
PRES
TEMP
PRES
TEMP
15
Summary of Contents for AKO-14545
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