Compressor Model Selection; Compressor Operation - Daikin V3 Technical Manual

Compressor Model Selection

*Applicable only with manufacturer password
Only one Scroll BLDC compressor controlled
via Power+ inverter can be selected. The type
of compressor is chosen in Compressors->
Advanced (Cag02).
The BLDC compressor is managed via
Modbus and works only if connected to an
inverter drive. If there is no communication
with the driver, the compressor will not be
able to operate.
•
If the controller is replaced, the new system can be
configured manually under the menu Compressors ->
Advanced-> screen Cag02. Select YES for Set defaults
and press ENTER.
•
Controller and drive must be powered and connected
via serial; the address of power+ must be 1 (default).
•
The type of compressor should be selected from the list
of available compressors under Application: Low
Temperature; the number of motor poles and the
correct model of drive are defined automatically.
Table 13: List of Compressor in Controller
Motor Type Motor Type
(R448A) (R449A)
SIAM SIAM
AGK33FDA- AGK33FDA-
R448A R449A
SIAM SIAM
AGK66FDB- AGK66FDB-
R448A R449A
SIAM SIAM
AGK87FDC- AGK87FDC-
R448A R449A
•
If the model of drive is the same model or larger than
the drive selected based on the type of BLDC
compressor, the default values can be written, and
controller can control the compressor. Otherwise, the
message "Not compatible" will be shown.
T-CU19-JAN24-1
Motor Type
(R404A)
SIAM
AGK33FDA-
R404A
SIAM
AGK66FDB-
R404A
SIAM
AGK87FDC-
R404A

Compressor Operation

Envelope management
•
The compressor working zone in the software is defined
based on the following measurements:
Condensing pressure
o
o Evaporation pressure
Discharge temperature
o
and compares these against the compressor envelope.
The controller manages the demand for capacity sent
to the drive, in a controlled manner to maintain the
compressor operating conditions within the limits of
pressure and temperature defined by the manufacturer
(zone 1a-1b). The actions to keep the compressor
within the operating zone specified by the
manufacturer are:
o Decrease in acceleration or deceleration, when
compressor operation approaches the limits, until
holding the speed when operation is at the limit.
o Speed reduction when operation is beyond the
high condensing pressure or high compression ratio
limits, to return within the permitted operating
zone.
•
When compressor operation remains too long in a zone
outside of the envelope, an alarm is generated (mask
Cag55, default 60sec). The zone number and
description are shown on the alarm mask. During start-
up, when the compressor operates at a fixed speed for
the minimum ON time, this alarm is disabled.
•
The discharge temperature alarm is always active.
•
The following zones are defined:
1. Inside the envelope (a, b with different maximum
discharge temperature)
2. High compression ratio
3. High condensing pressure
4. High current
5. High evaporation pressure
6. Low compression ratio
7. Low pressure differential
8. Low condensing pressure
9. Low evaporation pressure
Figure 11: Compressor Operating Zone
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