Emerson XM678D Manual page 12

LABEL VALUE
PMU Bar Pressure measurement unit.
PrE
PMd Pressure probe visualization
dE
rES Resolution (only °C).
Lod tEr
Local display: default display.
rEd tEr Remote display: default display.
dLY 0.0 Display delay.
rPA P1 Regulation probe A.
rPb nP
Regulation probe B.
Virtual probe percentage (room
100
rPE
temperature).
DEFROST
dPA P2
Defrost probe A.
dPb nP Defrost probe B
Percentuale
dPE 100
sbrinamento
tdF EL
Defrost kind.
in
EdF Defrost mode.
End defrost temperature on probe A
dtE 8.0
(dPA).
idF 6 Defrost interval.
MdF 45
(Maximum) duration for defrost.
0
dSd Defrost start delay after request.
it
dFd Display during defrost.
dAd 30 Display delay.
Fdt 1
Drain down time after defrost.
dPo n
Defrost at power-on.
dAF 0.0
Defrost delay after continuous cycle.
FAN
FPA P2
Fan probe A
FnC O-n
Fan operating mode.
Fnd 10
Fan delay after defrost.
Temperature differential to avoid short
10
FCt
cycles of fans.
FSt 2.0 Fan stop temperature.
1.0
FHY Fan stop differential
tFE n
Fan thermostat also during defrost
1592023140 XM678D GB r2.8 01.09.2017.docx
DESCRIPTION
nP(0) - P1(1) - P2(2) - P3(3) -
prima sonda
0 ÷ 100 (100=dPA, 0=dPb)
RANGE
It selects the pressure measurement units. MPA means the value
bAr(0); PSI(1); MPA(2)
of pressure measured by kPA*10.
It selects the visualization of pressure probe (P5): tEM =
tEM, PrE
temperature; PrE = pressure
It sets decimal point display.
dE; in in = 1°C;
dE = 0.1 °C.
It selects which probe is displayed by the instrument.
nP(0); P1(1); P2(2);
nP = no probe;
P3(3); P4(4); P5(5);
P1, P2, P3, P4, P5, P6, tEr = virtual probe for thermostat;
P6(6); tEr(7); dEF(8)
dEF = virtual probe for defrost.
It selects which probe is displayed by the X-REP.
nP(0); P1(1); P2(2);
nP = no probe;
P3(3); P4(4); P5(5);
P1, P2, P3, P4, P5, P6, tEr = virtual probe for thermostat;
P6(6); tEr(7); dEF(8)
dEF = virtual probe for defrost.
When the temperature changes, the display will be updated of 1°C
0.0 to 24h00min (144) / 1°F when delay time expires.
Format: min.10sec, resolution: 10sec.
nP(0); P1(1); P2(2); First probe used to regulate room temperature. If [rPA = nP] the
P3(3); P4(4); P6(5) regulation is performed with real value of rPb.
nP(0); P1(1); P2(2); Second probe used to regulate room temperature. If [rPb = nP] the
regulation is performed with real value of rPA.
P3(3); P4(4); P6(5)
It defines the percentage of the rPA respect to rPb. The value used
to regulate room temperature is obtained by:
0 to 100%
value_for_room = (rPA*rPE + rPb*(100-rPE))/100
First probe used for defrost. If [dPA = nP] the regulation is
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5) performed by time
Second probe used for defrost. If [dPb = nP] the regulation is
P4(4) - P5(5) performed with dPA.
It defines the percentage of the dPA respect to dPb. The value
used to regulate room temperature is obtained by:
value_for_defrost= (dPA*dPE + dPb*(100-dPE))/100
EL = defrost with electrical heater;
in = hot gas defrost. NOTE: The valve opening percentageduring
EL; in
the defrost is set by the par. oPd.
rtC = defrost activation via RTC with Ld1, Ld2 ... parameters;
rtC; in
in = defrost activation with idF parameter.
Set the temperature measured by the evaporator probe dPA which
[-55.0°C to 50.0°C]
stops the defrost. N.B.: parameter enabled only when the
[-67°F to 122°F]
evaporator probe is present.
It sets the time interval between the beginning of two defrost cycles.
[EdF = in]: it is the interval between 2 defrost;
[EdF = rtC]: it is the safety interval in case of clock alarm [RtC –
0 to 120hours
RtF].
[idF = 0]: the defrost can be activated only manually, or through
RS485 or from external contact or from LAN.
When dPA in not present, it sets the defrost duration, otherwise it
0 to 255min
sets the maximum duration for defrost.
Useful when different defrost start times are necessary to avoid
0 to 255min
overloading the plant.
rt = real temperature for Lod probe;
it = initial temperature (reading when defrost start);
rt; it; SEt; dEF
SEt = set-point value;
dEF = "dEF" label is visualized.
Set the maximum time between the end of defrost and the
0 to 255min
restarting of the real room temperature display.
Time interval between reaching defrost termination temperature
and the restoring of the control's normal operation. This time allows
0 to 255min the evaporator to eliminate water drops that might have formed due
to defrost. The fan and the thermoregulation output are OFF during
this time.
First defrost after start-up:
Y = Immediately;
n; Y
n = after the idF time.
Time interval between the end of the fast freezing cycle and the
0.0 to 24h00min (144) following defrost related to it.
Format: hours.10min, resolution: 10min.
First probe used for fan. If [FPA = nP] the regulation is performed
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5) with real value of FPb.
C-n = running with the solenoid valve, OFF during the defrost;
C-Y = running with the solenoid valve, ON during the defrost;
C-n; C-Y; O-n; O-Y
O-n = continuous mode, OFF during the defrost;
O-Y = continuous mode, ON during the defrost.
The time interval between the ending of the defrost and the starting
0 to 255min
of the evaporator fans.
If the difference of temperature between the evaporator and the
[0.0°C to 50.0°C]
room probes is more than the value of the FCt parameter, the fans
[0°F to 90°F]
will start.
[-55.0°C to 50.0°C]
Evaporator probe temperature above which the fan is always OFF.
[-67°F to 122°F]
[0.1°C to 25.5°C] When stopped, fan restarts when fan probe reaches [FSt – FHY]
[1°F to 45°F] value of temperature.
n = fan follows FnC setting during defrost without temperature
control
n; Y
y = fan follows FnC setting during defrost with FSt temperature
control
XM678D
NOTES
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15