Technical data

58 OM 1191
Embedded Fieldbus
Troubleshooting
The troubleshooting table below should be followed in
order from top to bottom by parameter number. Begin the
troubleshootingprocessbydisplayingtherst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 34: Troubleshooting
Parameter Number Display on Panel (Symptom) Possible Cause Corrective Action
5308 UART ERRORS Rapidly Increasing Numeric Value
1
1. Duplicate Addresses
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. Ensure EFB PROTOCOL parameters 5302
[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.]
2. Swap wires B(+) & A(-).
3. Adjust parameter 5303 & Cycle power.
4. Change parity using parameter 5304 & cycle
power.
5. Limit to 31 devices on 1 segment.
6. Turn off VFD termination resistors (move
jumpers). Install loose resistor recommended
by the DCS controls company. (Terminate
nal device on the trunk.)
7. Install EIA-485 (3 conductor shielded) data
grade cable communications wire. See
drawings on page 1-190.
8. Find and correct ground loop or high voltage
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(-).
MD5 164 ohms +/- 5%
If measurements are not within the specied
range the EIA-485 transceiver is bad, replace
the assembly containing the EIA-485 port.
5307 (5007) DV CRC
ERR
Rapidly Increasing Numeric Value
1
1. Duplicate Addresses
2. Too many devices on wire
3. Noise on EIA-485 wire
1. See Corrective Action 1. Parameter Number
5308
2. Limit to 31 unit loads on 1 segment (MD5 =
1 unit load)
3. See Corrective Action 7. Parameter Number
5308
5309 (5009) DV
STATUS
IDLE
1. No network connection
2. Blown EIA-485 transceiver
3. Wrong application number (FLN only)
1. Land communication wires as shown in
drawings on page1-190. Check Repeater (if
installed onsite).
2. See Corrective Action 8. Parameter Number
5308.
3. Change application number in the Siemens
eld panel.
5316 (5016) DV PAR
16 (BACnet Only)
Not Increasing Numeric Value
1. Drive device address parameter 5302 is set
to 128 or greater.
2. Max Masters is set too low on all drives.
1. Change parameter 5302 to a unique value
below 128.
2. Change Max Masters property at all devices
on bus to 127.
5306 (5006) DV OK
MSG
OK Message Counter not increasing
1
1. Master/Client not communicating with drive.
2. Failed router
1. Add device and points to the building control
system.
2. Replace router.
1. Reset by pressing UP & DOWN arrows simultaneously in edit mode. Save change by pressing ENTER.