1592020680 XRi60CH EN r2.0 2021.07.14
XRi60CH
2/9
-
FCC = o_n:
fans will run even if the compressor is off, and not run during defrost
-
FCC = C_Y:
fans will switch ON and OFF with the compressor and
run
during defrost
-
FCC = o_Y:
fans will run continuously also during defrost
The par.
FAC
is used to select which temperature probe will be used from the condenser fan regulator.
This regulator uses a specific setpoint (par.
St2
) and differential (par.
HY2
) to activate and deactivate
the condenser fans:
-
If
T>St2+HY2
the condenser fans are activated
-
If
T<St2
the condenser fans are deactivated
The par.
FCo
can be used to keep the ventilators active for a period after compressor OFF.
6.
AUXILIARY REGULATOR
The auxiliary regulator can be be linked to a digital output (relay) for ONOFF regulation.
The parameters used to configure the auxiliary regulators are the following:
ACH
Kind of action for auxiliary regulator
SAA
Set point for auxiliary regulator
SHY
Differential for auxiliary regulator
ArP
Probe selection for auxiliary regulator
Sdd
Auxiliary regulator disabled during any defrost
7.
DUAL MAP FEATURE
The controller is programmed with 2 different parameter maps. In this way, it is possible to choose the
right map to meet both LT and NT applications. There are two different way to do this:
-
If
i1F=nt
, it will be possible to change the working map by using the digital input.
-
By using button if it is linked to the map changing function (for example:
d2n=Lnt
).
8.
VARIABLE SPEED COMPRESSOR CONTROL
8.1
FREQUENCY MODE
The controller can drive variable speed compressors with frequency control input. The frequency
output port can issue a frequency signal from 30 to 200Hz, duty cycle=50%. A special cable must be
used to connect the frequency output of the controller to the frequency input of the specific inverter.
-
CAB/EM1: cable
DD900002 20
for Embraco models
-
CAB/SE1: cable
DD900002 22
for SECOP NLV models
NOTE:
-
An inverter compressor can be completely controlled from the frequency output only.
-
Only one compressor can be connected when frequency mode is used
1.1
PARAMETERS
The regulation band is from
SET
to
SET+HY+HY1
. When the regulation is running, the compressor
speed is continuously calculated and updated by the PI regulator.
In case of regulation probe error, the compressor speed will be set to the value of par.
SPi
.
It is possible to enable a cyclic or a continuous mode operation both during normal mode and energy
saving mode:
-
CMn, CME = Y
: after reaching the SETPOINT the VSC will keep on running
-
CMn, CME = n
: after reaching the SETPOINT the VSC will be stopped
1.2
HOT GAS DEFROST
If hot gas defrost is selected, it will be possible to set the compressor speed by using par.
Aod
.
1.3
PULL DOWN
An automatic function named PULL DOWN is implemented. This function forces the controller to work
at
FMA
until reaching a specific SETPOINT (par.
CCS
) for a maximum interval of time (par.
CCt
). The
PULL-DOWN function is activated:
-
At start-up if the temperature measured from the regulation probe is higher than the
SET+HY+HY1
-
After any defrost
-
If the temperature measured from regulation probe go over the
SET+HY+HY1+oHt
value.
If one of the above conditions happens, the controller will maintain the maximum compressor speed
(
FMA
) until reaching the
CCS
setpoint. The maximum interval of time for any PULL DOWN is defined
from par.
CCt
.
8.2
OIL MIGRATION CONTROL (VALID ONLY FOR VSC)
To avoid oil migration during variable speed compressor operation, a lubrication control is
implemented. If the compressor works with a speed lower than the
MnP
threshold for
tMi
time, then
the compressor speed will be increased to
FMA
for
tMA
time.
NOTES:
-
MnP= FMi to FMA, nu, OFF
-
If
MnP=nu
, then this function is disabled
-
If
MnP=oFF
, then the compressor will be stopped for
tMA
if it works continuously for
tMi
.
8.3
PI ALGORITHM
The VSC regulator implements a PI (Proportional-Integral) algorithm to guarantee temperature stability
always near the setpoint. Here below there are some advises for parameter settings in some
applications.
Low Temperature Applications
Normal Temperature Applications
HY
0.3
2
HY1
0.7
1
tSt
1 to 3 min
1 to 3 min
iSt
10 to 20 min
5 to 10 min
rSr
20 to 60
90 to 180
Str
40 to 80 sec
10 to 20 sec
voS
1 to 3
3 to 5
vo2
3 to 7
5 to 10
vo3
5 to 10
5 to 10
tHv
90 to 120 sec
20 to 30 sec
tLv
30 to 60 sec
5 to 10 sec
dPt
2 to 4
1 or 2
SAt
5 to 10 min
1 to 3 min
NOTE:
-
Every application needs specific tuning tests to find the optimal values.
-
Use
HY
<
HY1
(better if
2*HY <= HY1
) in Low Temp Applications
-
Use
HY > HY1
(better if
HY >= 2*HY1
) in Normal Temp Applications
9.
FRONT PANEL AND COMMANDS
To display target set point; in programming mode it selects a parameter or confirm
an operation.
(
DEF
) To start a manual defrost.
(
UP
) To see the used parameter map. When in programming mode, it browses the
parameter codes or increases the displayed value.
(
DOWN
) To see the used parameter map. When in programming mode, it browses
the parameter codes or decreases the displayed value.
Keep it pressed 5 sec to change parameter map from “nt” to “Lt” and vice
-versa
(valid when button properly configured).
To switch the instrument on and off (when
onF=oFF
).
To switch on and off the light (when
oAx=LiG
).
KEY COMBINATIONS:
+
To lock & unlock the keyboard
+
To enter in programming mode
+
To exit the programming mode
9.1
USE OF LEDS
Icon functions are described in the following table:
LED
MODE FUNCTION
ON
Compressor enabled
Flashing Anti-short cycle delay enabled
ON
Defrost enabled
Flashing Drip time in progress
ON
Fans enabled
Flashing Fans delay activation (for example after any defrost)
ON
An alarm is occurring
ON
A PULL DOWN is running
ON
Energy saving enabled
ON
Light on
ON
Auxiliary relay on
,
ON
Measurement unit
Flashing Programming phase
10.
MAX & MIN TEMPERATURE MEMORIZATION
10.1
HOW TO SEE THE MIN TEMPERATURE
1.
Press and release the
DOWN
button (if properly configurated).
2.
The “
Lo
” message will be displayed followed by the minimum temperature recorded.
3.
By pressing the
DOWN
button again or waiting for 5 sec the normal display will be restored.
10.2
HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the
UP
button (if properly configurated).
2.
The “
Hi
” message will be displayed followed by the maximum temperature recorded.
3.
By pressing the
UP
button again or waiting for 5 sec the normal display will be restored.
10.3
HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
1.
Keep
SET
button pressed for more than 3 sec while the max or min temperature is displayed.
(
“
rSt
”
message will be displayed)
2.
After confirming the operation,
the “
rSt
” message
will start blinking and then the normal
temperature will be displayed.
