Emerson XM678D - Commissioning Procedures; Electronic Valve Settings Configuration

26 • XM678D I&O Manual 026-1219 Rev 3
15 Commissioning
15.1.Clock Setting and RTC
Alarm Reset
If the clock is present: [EdF = rtC] enable the defrost
from rtc [Ld1 to Ld6].
BEGIN
Press the up arrow key
once to access the fast
access menu.
Display
HM identify the clock RTC, press
Display
HUr = hour -> press
to save or
change
MIn = minutes -> press
to save
or change
Do not use the other parameters if
present.
EXIT
Press SET + up arrow
keys for 10 seconds to
reset the RTC alarm.
15.2.Electronic Valve
Settings
The following parameters needs to be checked:
[1] Superheat temperature probe: NtC, PtC,
Pt1000
with parameter P6C. The sensor has to be
fixed at the end of the evaporator.
[2] Pressure transducer:
[4 to
20mA] or
ratiometric P5C=420 or 5Vr with parameter P5C.
[3] Range of measurement: Check the
conversion parameters, PA4 a
nd P20, that are related
to the transducer.
TRANSDUCER: For [-0.5
/7Bar] or [0.5/8Bar abs],
the correct setup is relative pressure with PA4=-0.5
and P20=7.0. For [0.5/12Bar abs], the correct setup is
relative pressure with PA4=-0.5 and P20=11.00.
Example or virtual pressure with unique [4 to 20mA]
or [0-5V] transducer:
Adr n n+1 n+2
LPP LPP=n LPP=Y LPP=n
P5C
LAN or
probe not
connected
P5C=420
or 0
-5V
LAN or
probe not
connected
PA4 not u
sed -0.5 bar not used
P20 not used 7.0 bar not used
[4] From the EEV submenu: Select the correct
kind of gas with the FTy parameter.
[5] Use the following parameters to set up the
correct v
alve drive (based on the valve data sheet of
the manufacturer):
Table 15-1 - Clock Setting and RTC Alarm Reset 
Note: The rtC clock menu is present also on the second level
parameters.
CAUTION! If the board displays the rtF alarm,
it means that the board has to be replaced.
Parame-
ter
XM6x8D_1
w/o
transducer
XM6x8D_
2 + with
transducer
XM6x8D_3
+ w/o
transducer
Table 15-2 - Example or virtual pressure with unique 4-20mA or
0-5V transducer
tEU
Type of stepper motor: (uP- bP)
Allows selection of the kind of valve.
uP= 5- 6 wires unipolar valves, bP= 4 wires
bipolar valves
CAUTION! Changing this parameter will
require a valve restart.
tEP
Predefined valve selection: (0 to 10)
If
tEP=0, the user has to modify all the
co
nfiguration parameters to use the valve. If
tEP is not equal to 0, the device performs a fast
configuration of the following parameters: LSt,
uSt, Sr, CPP, CHd. To select the right number,
please read Table 6-2.
If t
EP is not equal to 0, prev
ious configuration
of the LSt, uSt, Sr, CPP, and CHd parameters
is overwritten.
HFS
Kind of motor movement: (HAF; FUL)
HAF=
half step. Use this setting for the unipolar
valv
e.
FUL= full
step. Use this setting for the bipolar
valv
e.