Emerson XM678D - XM678 D Installation and Mounting Guide; Mounting and Environmental Considerations

1592023140 XM678D GB r2.8 01.09.2017.docx XM678D 12/15
LABEL VALUE DESCRIPTION RANGE NOTES
PMU
Bar
Pressure measurement unit. bAr(0); PSI(1); MPA(2)
It selects the pressure measurement units.
M
PA
means the value
of pressure measured by kPA*10.
PMd
PrE
Pressure probe visualization tEM, PrE
It selects the
visualization of pressure probe (P5):
tEM =
temperature; PrE = pressure
rES
dE
Resolution (only °C). dE; in
It sets decimal point display.
in = 1°C;
dE = 0.1 °C.
Lod
tEr
Local display: default display.
nP(0); P1(1); P2(2);
P3(3); P4(4); P5(5);
P6(6); tEr(7); dEF(8)
It selects which probe is displayed by the instrument.
nP = no probe;
P1, P2, P3, P4, P5, P6, tEr = virtual probe for thermostat;
dEF = virtual probe for defrost.
rEd
tEr
Remote display: default display.
nP(0); P1(1); P2(2);
P3(3); P4(4); P5(5);
P6(6); tEr(7); dEF(8)
It selects which probe is displayed by the X-REP.
nP = no probe;
P1, P2, P3, P4, P5, P6, tEr = virtual probe for thermostat;
dEF = virtual probe for defrost.
dLY
0.0
Display delay. 0.0 to 24h00min (144)
When the temperature changes, the display will be updated of 1°C
/ 1°F when delay time expires.
Format: min.10sec, resolution: 10sec.
rPA
P1
Regulation probe A.
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
First probe used to regulate room temperature. If
[rPA = nP]
the
regulation is performed with real value of rPb.
rPb
nP
Regulation probe B.
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
Second probe used to regulate room temperature. If
[rPb = nP]
the
regulation is performed with real value of rPA.
rPE
100
Virtual probe percentage (room
temperature).
0 to 100%
It defines the percentage of the
rPA
respect to
rPb
. The value used
to regulate room temperature is obtained by:
value_for_room = (rPA*rPE + rPb*(100-rPE))/100
DEFROST
dPA
P2
Defrost probe A.
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
First probe used for defrost. If
[dPA = nP]
the regulation is
performed by time
dPb
nP
Defrost probe B
nP(0) - P1(1) - P2(2) - P3(3) -
P4(4) - P5(5)
Second
probe used for defrost. If
[dP
b
= nP]
the regulation is
performed with dPA.
dPE
100
Percentuale prima sonda
sbrinamento
0 ÷ 100 (100=dPA, 0=dPb)
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
tdF
EL
Defrost kind. EL; in
EL
= defrost with electrical heater;
in = hot gas defrost. NOTE: The valve opening percentageduring
the defrost is set by the par. oPd.
EdF
in
Defrost mode. rtC; in
rtC
=
defrost activation via RTC with
Ld1
,
Ld2
... parameters;
in = defrost activation with idF parameter.
dtE
8.0
End defrost temperature on probe A
(dPA).
[-55.0°C to 50.0°C]
[-67°F to 122°F]
Set the temperature measured by the evaporator probe
dPA
which
stops the defrost. N.B.: parameter enabled only when the
evaporator probe is present.
idF
6
Defrost interval. 0 to 120hours
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 –
RtF].
[idF = 0]: the defrost can be activated only manually, or through
RS485 or from external contact or from LAN.
MdF
45
(Maximum) duration for defrost. 0 to 255min
When
dPA
in not present, it sets the defrost d
uration, otherwise it
sets the maximum duration for defrost.
dSd
0
Defrost start delay after request. 0 to 255min
Useful when different defrost start times are necessary to avoid
overloading the plant.
dFd
it
Display during defrost. rt; it; SEt; dEF
rt
=
real temperature for
Lod
probe;
it = initial temperature (reading when defrost start);
SEt = set-point value;
dEF = “dEF” label is visualized.
dAd
30
Display delay. 0 to 255min
Set the maximum time between the end of defrost and the
restarting of the real room temperature display.
Fdt
1
Drain down time after defrost. 0 to 255min
Time interval between reaching defrost termination temperature
and the restoring of the control’s normal operation. This time allows
the evaporator to eliminate water drops that might have formed due
to defrost. The fan and the thermoregulation output are OFF during
this time.
dPo
n
Defrost at power-on. n; Y
First defrost after start-up:
Y = Immediately;
n = after the idF time.
dAF
0.0
Defrost delay after continuous cycle. 0.0 to 24h00min (144)
Time interval between the end of the fast freezing cycle and the
following defrost related to it.
Format: hours.10min, resolution: 10min.
FAN
FPA
P2
Fan probe A
nP(0); P1(1); P2(2);
P3(3); P4(4); P6(5)
First probe used for fan. If
[FPA = nP]
the regulation
is performed
with real value of FPb.
FnC
O-n
Fan operating mode. C-n; C-Y; O-n; O-Y
C
-
n
=
running with the solenoid valve, OFF during the defrost;
C-Y = running with the solenoid valve, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-Y = continuous mode, ON during the defrost.
Fnd
10
Fan delay after defrost. 0 to 255min
The time interval between the ending of the defrost and the starting
of the evaporator fans.
FCt
10
Temperature differential to avoid short
cycles of fans.
[0.0°C to 50.0°C]
[0°F to 90°F]
If the difference of temperature between the evaporator and the
room probes is more than the value of the FCt parameter, the fans
will start.
FSt
2.0
Fan stop temperature.
[-55.0°C to 50.0°C]
[-67°F to 122°F]
Evaporator probe temperature above which the fan is always OFF.
FHY
1.0
Fan stop differential
[0.1°C to 25.5°C]
[1°F to 45°F]
When stopped, fan restarts when fan probe reaches
[FSt
–
FHY]
value of temperature.
tFE
n
Fan thermostat also during defrost n; Y
n
=
fan follows FnC setting during defrost without temperature
control
y = fan follows FnC setting during defrost with FSt temperature
control