D145H4502 Ed. 01
12
WITH FREQUENCY CONVERTER
Operation is the same as in the previous point, but modulating the power of compressor 1 with the converter while
it remains in the neutral zone using a PID control.
Near the upper limit, the compressor operates at its maximum capacity, and if said limit is exceeded, more stages/
compressors are added, in accordance with the interval defined in t02, until returning to the neutral zone.
To avoid delays in the reaction of the installation, t02 time is halved in the compressor equipped with an inverter.
Near the lower limit, the compressor operates at its minimum capacity, and if said limit is exceeded, it stops. The rest
of the stages/compressors will stop, in accordance with the interval programmed in t01, until re-entering the neutral
zone, upon which compressor 1 activates again at its minimum capacity.
Pump Down
It is only available if the type of operation is direct (C07=0).
When the pressure reaches the Set Point value (E01) in probe 1, the last stage/compressor remaining in operation
does not stop; it continues to reduce the pressure until reaching the value configured in parameter E08.
In the event of a failure, if the value of E08 is not reached, the controller will stop the compressor once the security
interval defined in E09 has passed, displaying the message “PdA” (an informative message that does not affect
the unit’s operation).
For this function to be active, the parameter E08 must be configured below the Set Point (E01).
SP+E06
SP-E06
SP
R1
R2
R4
R1
R2
R2
R3
R1
R2
R1
R2
R3
R2
R3
R4
R3
100 %
100 %
0 %
OFF
(R1 OFF)
t02
t01
Pres / Temp (Probe 1)
Time
CONVERTER STATUS
Lower limit
Upper limit
NEUTRAL
ZONE
To Next Page
