Table of Contents
Advertisement
Troubleshooting
The troubleshooting table below should be followed in
order from top to bottom by parameter number . Begin the
troubleshooting process by displaying the first parameter in
the table (5308) and determining if the display on the panel
exhibits the symptom . If it does, review the possible cause(s)
and take the necessary corrective action(s) . Once the symptom
for this parameter is eliminated, continue to the next parameter
and repeat the process until you have reached the end .
Table 36: Troubleshooting
Parameter Number
Display on Panel (Symptom)
5308 UART ERRORS
Rapidly Increasing Numeric Value
5307 (5007) DV CRC
Rapidly Increasing Numeric Value
ERR
5309 (5009) DV
STATUS
5316 (5016) DV PAR
Not Increasing Numeric Value
16 (BACnet Only)
5306 (5006) DV OK
OK Message Counter not increasing
MSG
1 . Reset by pressing UP & DOWN arrows simultaneously in edit mode . Save change by pressing ENTER .
OM 1191 • MD5 VFD
1 . Duplicate Addresses
1
2 . Swapped Wires
3 . Incorrect Baud Rate
4 . Incorrect Parity
5 . Too many devices on wire
6 . Incorrect Bias
7 . Noise on EIA-485 wire
8 . Blown EIA-485 transceiver
1 . Duplicate Addresses
1
2 . Too many devices on wire
3 . Noise on EIA-485 wire
IDLE
1 . No network connection
2 . Blown EIA-485 transceiver
3 . Wrong application number (FLN only)
1 . Drive device address parameter 5302 is set
to 128 or greater .
2 . Max Masters is set too low on all drives .
1 . Master/Client not communicating with drive .
1
2 . Failed router
Possible Cause
1 . Ensure EFB PROTOCOL parameters 5302
2 . Swap wires B(+) & A(-) .
3 . Adjust parameter 5303 & Cycle power .
4 . Change parity using parameter 5304 & cycle
5 . Limit to 31 devices on 1 segment .
6 . Turn off VFD termination resistors (move
7 . Install EIA-485 (3 conductor shielded) data
8 . Find and correct ground loop or high voltage
MD5 164 ohms +/- 5%
If measurements are not within the specified
range the EIA-485 transceiver is bad, replace
the assembly containing the EIA-485 port .
1 . See Corrective Action 1 . Parameter Number
2 . Limit to 31 unit loads on 1 segment (MD5 =
3 . See Corrective Action 7 . Parameter Number
1 . Land communication wires as shown in
2 . See Corrective Action 8 . Parameter Number
3 . Change application number in the Siemens
1 . Change parameter 5302 to a unique value
2 . Change Max Masters property at all devices
1 . Add device and points to the building control
2 . Replace router .
58
e
f
Mbedded
Corrective Action
[also 5311 & 5317 when using BACnet] are
unique . 5302 must be a unique address on
the segment . [5311 & 5317 must be unique
addresses on the network when using
BACnet .]
power .
jumpers) . Install loose resistor recommended
by the DCS controls company . (Terminate
final device on the trunk.)
grade cable communications wire . See
drawings on page 1-190 .
problems before replacing any component
assemblies . Perform the following steps
to determine if the EIA-485 transceiver is
damaged .
a . Power unit down .
b . Remove bus wires and retighten
connections .
c . Turn bus termination ON .
d . Measure impedance between B(+) & A(-) .
5308
1 unit load)
5308
drawings on page1-190 . Check Repeater (if
installed onsite) .
5308 .
field panel.
below 128 .
on bus to 127 .
system .
www .DaikinApplied .com
ieldbUs
Advertisement
Table of Contents
