Emerson XM678D User Manual

RS485 Net Monitoring Temperatures Pressure Transducer Setup • 17
9 Pressure
Transducer Setup
Virtual Pressure: In this example of programming,
the master device is the regulator with the pressure
probe connected.
tPP = LAn
LPP = n
P5C = nP
tPP = PP
LPP = Y
P5C = 420
(transd.)
Tpp = LAn
LPP = n
P5C = nP
Pb6
Superheat
Probe
Pb6
Superheat
Probe
Pb6
Transducer
4 to 20mA
Pb6
Superheat
Probe
38 39
19 20 21 22
38 39
38 39
Press the arrow keys to access menu readings for
pressure.
Once set up, check these readings:
Slave device
pressure:
rPP:
Shows the
value o
f
pressure
received by
remote pressure
probe connected
to other
XM600K
device.
Master device
pressure:
dPP = Show
s
the value of
pressure
measured by
pressure
transducer.
dP5 = Shows
the temperature
value
measured
by probe 5.
Slave device
pressure:
rPP: Shows th
e
value of
pressure
received by
remo
te pressure
probe connected
to other
XM600K
device.
Check for error messages. Error message examples:
• dPP = Err: in the Master device, the value of
pressure read from the transducer is outside the
acceptable range regarding parameters PA4- PA20;
is connected incorrectly or it is not configured to
parameter P5C.
• PPF = reading on the slave device - LAN
communication is not functional.
• tPP = LAn: in the master controller, LAN address
sequences are not correct. LPP = Y means the
address sequences are not correct.
Final Control From Superheat (SH) Reading Control
Values:
• dPP = Shows the value of pressure measured by
pressure transducer.
• dP6 = Shows the temperature measured by probe 6.
Corresponds to the outlet temperature of gas of the
evaporator.
• SH = Shows the actual superheat value. It must have
a consistent value for difference between the values
dP6 and dP5. If displaying nA, err or nd, the value
is not calculable at the moment of the reading.
9.1. RS485 Net Monitoring
Temperatures
4 to 20 mA for PP07, PP11,
or similar models
Generic metric ratio
0 to 5V
SlaveMasterSlave
Brown
In
+12v
gnd
In
+5v
1. Terminals -36 and
+37
2. Use Belden cable
#8762 or #8772
3. Keep at a maximum
distance of
approximately 1Km
Shielded Serial Cable

Emerson XM678D Specifications

General

Brand	Emerson
Model	XM678D
Category	Controller
Language	English