Emerson XM678D - Page 54

46 • XM678D I&O Manual 026-1219 Rev 3
Fot nU Manual opening
0 to 100%
nU
Allows the valve opening to force to the
specified value. This value overwrites
the one calculated by PID algorithm.
CAUTION! It
must be [Fot =
nU] to
have
correct superheat regulation.
PA4 0
Probe value at
4mA or at 0V
Meas
Unit
Range
BAR
[PrU=rE]
-1.0 to P20
[PrU=Ab]
0.0 to P20
PSI
[PrU=rE]
-14 to P20
[PrU=Ab]
0 to P20
dKP
[PrU=rE]
-10 to P20
[PrU=Ab]
0 to P20
Pressure value at 4mA for current probe
[4 to 20mA] or value at 0V for
ratiometric probes. The value is
absolute or relative according to PrU
parameter.
P20 200
Probe value at
20mA
or at 5V
Meas
Unit
Range
BAR
[PrU=rE]
PA4 to 60.0
[PrU=Ab]
PA4 to 60.0
PSI
[PrU=rE]
PA4 to 870
[PrU=Ab]
PA4 to 870
dKP
[PrU=rE]
PA4 to 600
[PrU=Ab]
PA4 to 600
Pressure value at 20mA for current
probe [4 to 20mA] or value at 5V for
ratiometric probes. The value is
absolute or relative according to PrU
parameter.
LPL 0
Lower Pressure
Limit
for superheat
regulation
PA4 to P20
EXPERT: When
the suction pressure
goes down the lower bound LPL,
superheat regulation will use a fixed
pressure value. Otherwise, the normal
pressure value will be used (according
to PrU parameter).
MOP 100
Maximum
operati
ng pressure
threshold and valve
closing of dML
value
LOP to P20
If the suction pressure exceeds the
m
aximum operating pressure value, the
device will signal this situation
generating the MOP alarm (according
to PrU parameter).
Label Value Description Range Notes
Table 24-1 - Default Parameter Map