Carel Hecu handleiding
Handleiding
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Hecu +0300023EN rel. 1.2 - 14.12.2021
6. FUNCTIONS
6.1 Unit ON/OFF
The unit can be switched on and off from:
• User terminal
• Supervisor
• Digital input
On-off from the user terminal and the confi guration parameters are
available under the main menu, branch A.c.
On-off from the supervisor and from the digital input and start-up after a
blackout (with specifi c delay, to avoid continuous starts and stops in the
event of instability in the power supply) need be enabled.
On-off from the digital input is equivalent to an enabling signal, that is, if
the digital input is Off the unit cannot be switched on in any other way,
while if it is On, the unit can be switched on or off in any other way, with
the same priority (the most recent has precedence, whatever the origin),
as shown in the fi gure:
User interface
Supervisor
Digital Input
Unit On/Off
Fig. 6.a
Notice: certain special conditions or functions in the Hecu software
cause the unit to shutdown:
• Confi guration of some parameters: e.g. inputs/outputs, confi guration
of compressors, inverter parameters.
• Installation of default parameters
• Manual management
6.2 BLDC compressor
One Scroll BLDC compressor controlled via Power+ inverter can
be selected. The type of compressor is chosen in Compressors Æ
Confi guration (Caf15).
The BLDC compressor is managed via Modbus and works only if
connected to a CAREL power+ inverter. If there is no communication
with the inverter, the compressor will not be able to operate.
Caution: Hecu can also manage an optional backup compressor,
which can operate in place of the main BLDC compressor in the event of
faults or alarms.
Notice: contact your reference CAREL branch to check the
updated list of compressors available and confi gurable on the Hecu
controller.
Manual con guration
Hecu automatically downloads the optimised parameters for each model
of compressor at the end of the wizard procedure.
If the model of compressor is changed or the power+ is replaced, the
new system can be confi gured manually under the menu Compressors
Æ Advanced Æscreen Cag02.
Hecu and power+ must be powered and connected via serial; the address
of power+ must be 1 (default).
The type of compressor is selected from the list of available compressors;
the number of motor poles and the correct model of power+ are defi ned
automatically.
Select YES for Set defaults and press ENTER.
If the model of power+ (as read by power+) is the same model or larger
than the power+ selected based on the type of BLDC compressor, the
default values can be written and Hecu can control the compressor.
Otherwise, the message “Not compatible” will be shown.
Envelope management
The envelope is the set of operating points within which the compressor
can operate safely for an indefi nite time. This can be presented
graphically by drawing the limits that the
operating conditions must remain within. The following fi gure shows an
example of an envelope.
Condensing
pressure
Evaporation
pressure
Cond.P max
Cond.P min
Evap.P min Evap.P max
Fig. 6.b
The boundaries of the envelope are represented by the:
• Minimum and maximum discharge pressure
• Minimum and maximum suction pressure
• Minimum and maximum compression ratio (CR)
• Maximum current drawn by the compressor
The operating conditions are defi ned by:
• Suction pressure
• Discharge pressure
• Discharge temperature
• Rotation speed (rps)
The controller manages the demand for capacity sent to the inverter,
in a controlled manner in order to maintain the compressor operating
conditions within the limits of pressure and temperature defi ned by
the manufacturer (zone 1a-1b in Figure 6.b). The actions to keep the
compressor within the operating zone specifi ed by the manufacturer are:
• Decrease in acceleration or deceleration, when compressor operation
approaches the limits, until holding the speed when operation is at
the limit.
• Speed reduction when operation is beyond the high condensing
pressure or high compression ratio limits, so as to return within the
permitted operating zone.
When compressor operation remains too long in a zone outside of the
envelope, an alarm is generated (screen Cag55, default 60sec). The zone
number and description is shown on the alarm screen.
During start-up, when the compressor operates at a fi xed speed for the
minimum ON time, this alarm is disabled.
The discharge temperature alarm is always active.
Bekijk gratis de handleiding van Carel Hecu, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Carel |
| Model | Hecu |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10743 MB |
