1592001530 XC15-35CX EN r1.2 11.04.2017 XC15-35CX
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It is possible to drive inverter with control signal of frequency or voltage (0-10 V DC) type.
NOTE:
the analog output is not configurable. It may be frequency or voltage type depending on
the hardware.
16.2.1
How regulation works
a.
The regulation starts when the value of the pressure/temperature of the suction line
increases and reaches the
St1
value. If available, the inverter-controlled compressor
will start and be controlled from the PI-regulator.
NOTE:
at the start-up the inverter-controlled compressor will be drived at maximum
power for
SUt
seconds in order to ensure proper lubrication.
b.
Within the regulation band [
SET-0.5*HY1
to
SET+0.5*HY1
] the capacity (speed) of the
inverter-controlled compressor will be modulated in accordance with the value of the
pressure/temperature variable and by using par.
voS
, when the pressure/temperature
is increasing, or by using par.
vo2
, when the pressure/temperature is decreasesing.
c.
When pressure/temperature is higher than
[SET+0.5*HY1]
and the compressor is
already at is maximum possible capacity (speed), then another compressor (if
available) will be activated after expiring delay
ton
.
NOTE:
if pressure/temperature goes over
[SET+0.5*HY1]
and the inverter-controlled
compressor is not available (due to safety delays
2on
and
2oF
or due to external signal),
another compressor will be activated (if available).
16.2.2
Capacity decrement and regulation stop
a.
When the pressure goes below the value [
SET-0.5*HY1
] the inverter-controlled
compressor will be forced at the minimum allowable capacity for the time
t1F
.
b.
After expiring the delay
toF
, the second compressor (if active when
oA2=CP2
) will be
deactivated and the inverter-controlled compressor will keep on working for interval of
time
doF
.
c.
After the delay
t1F
expires, the inverter-controlled compressor will be stopped.
16.2.3
Capacity limitation by using parameters PMi and PMA
The compressor capacity can be limited both in maximum and minimum value by using par.
PMi
and
PMA
as showed by the previous diagram:
-
PMi: (in percentage)
set the minimum value for the compressor capacity.
-
PMA: (in percentage)
set the maximum value for the compressor capacity.
16.3 DEAD BAND REGULATION
This kind of regulation is available only for ON-OFF compressors (
oA1=CP1
and
oA2=CP2
)
and if par.
rtY=db
.
It uses a control variable (pressure/temperature) and a symmetrical band (par.
HY1
) around the
SETPOINT. When the control variable is within the band the outputs stay unchanged. When the
control variable is outside the band, the outputs will be enabled or disabled, respecting the delay
in activation (par.
don
,
2on
) and deactivation (par.
doF
,
2oF
) according to the following chart:
Summary of Contents for Dixell XC15CX
Page 1: ...XC15CX XC35CX ...
