ABB ACH580 Series User Manual page 107

98
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 (58.11) 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.
The parameters in the list refer to Drive EFB 58xx and E-Clipse Bypass EFB 58xx.
The factory default setting for E-Clipse Bypass EFB parameter 5003 prevents the
network from seeing the E-Clipse Bypass. Change this setting ONLY if the bypass
will be seen as a node on the network. Troubleshoot the E-Clipse Bypass EFB
(50xx) portion ONLY if the bypass will be seen as a node on the network.
Parameter
Number
5811
UART
ERRORS
Embedded fieldbus
ACH580 E-Clipse bypass and packaged drive user manual
Display on
Panel Possible Cause
(Symptom)
Rapidly 1. Duplicate
Increasing Addresses
Numeric
1
Value
2. Swapped Wires
3. Incorrect Baud Rate
4. Incorrect Parity
5. Too many devices
on wire
6. Noise on EIA-485
wire
7. Blown EIA-485
transceiver
Corrective Action
1. Ensure Drive EFB parameters 5803 [also
5840 and 5899 when using BACnet] and
Bypass EFB parameters 5003 [also 5040
and 5099 when using BACnet] are
unique. 5803 and 5003 must be unique
addresses on the segment. [5840, 5899
and 5040, 5099 must be unique
addresses on the network when using
BACnet].
2. Swap wires B(+) and A(-).
3. Adjust parameter 5804 and Cycle power.
4. Change parity using parameter 5805 and
cycle power.
5. Limit to 31 unit loads on 1 segment.
6. Install EIA-485 (3 conductor shielded)
data grade cable communications wire.
See drawings on page 78.
7. 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 re-tighten
connections.
c. Turn bus termination ON.
d. Measure impedance between B(+)
and A(-)
ACH580 121 ohms +/- 5%
E-Clipse 140 ohms +/- 5%
If measurements are not within the
specified range the EIA-485 transceiver is
bad, replace the assembly containing the
EIA-485 port.