Technical data

34 • XM670K-XM679K I&O Manual 026-1218 Rev 0 19-DEC-2012
21 Pressure
Transducer Setup
(XM679K Only)
Virtual Pressure: In this example of program-
ming, the master device is the regulator with the pres-
sure probe connected.
Check for error messages. Error message exam-
ples:
• dPP = Err: in the Master device, the value of pres-
sure read from the transducer is outside the accept-
able range regarding parameters PA4- PA20; is
connected incorrectly or it is not configured to pa-
rameter P5C.
• PPF = reading on the slave device - LAN communi-
cation is not functional.
• tPP = LAn: in the master controller, LAN address
sequences are not correct. LPP = Y means the ad-
dress sequences are not correct.
Final Control From Superheat (SH) Reading Con-
trol 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.
21.1.RS485 Net Monitoring
Temperatures
21.1.1.RS485 Connection
Sharing a single pressure transducer across multi-
ple controllers on a LAN:
4 to 20 mA for PP07,
PP11, or similar models
Generic metric ratio
0 to 5V
Slave Master Slave
tPP = LAn
LPP = n
P5C = nP
tPP = PP
LPP = Y
P5C = 420
(transd.)
Tpp = LAn
LPP = n
P5C = nP
Press the arrow keys to access menu readings for
pressure.
Once set up, check these readings:
Slave device
pressure:
rPP: Shows the
value of pressure
received by
remote pressure
probe connected
to other
XM600K
device.
Master device
pressure:
dPP = Shows
the value of
pressure
measured by
pressure
transducer.
dP5 = Shows the
temperature
value measured
by probe 5.
Slave device
pressure:
rPP: Shows the
value of
pressure
received by
remote pressure
probe
connected to
other XM600K
device.
Brown
In
+12v
gnd
In
+5v
Pb6
Superheat
Probe
Pb6
Superheat
Probe
Pb6
Transducer
4 to 20mA
Pb6
Superheat
Probe
38 39
19 20 21 22
38 39
38 39
1. Terminals -36 and +37
2. Use Belden cable #8762
or #8772
3. Keep at a maximum dis-
tance of approximately
1Km
Figure 21-1 - Sharing a Pressure Transducer Between Devices
on LAN
Shielded Serial Cable
LAN LAN
Shielded Serial Cable