ABB ACH550-BCR, Руководство пользователя

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ACH550 E-Clipse Bypass User’s Manual 2-107
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 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.
The parameters in the list refer to Drive EFB 53xx and E-Clipse Bypass EFB 50xx.
The factory default setting for E-Clipse Bypass EFB parameter 5002 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
Display on
Panel
(Symptom)
Possible Cause Corrective Action
5308
(5008)
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. Noise on EIA-485
wire
7. Blown EIA-485
transceiver
1. Ensure Drive EFB parameters 5302 [also
5311 & 5317 when using BACnet] and
Bypass EFB parameters 5002 [also 5011
& 5017 when using BACnet] are unique.
5302 & 5002 must be unique addresses
on the
segment
. [5311, 5317 & 5011,
5017 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 unit loads on 1 segment.
6. Install EIA-485 (3 conductor shielded)
data grade cable communications wire.
See drawings on page
1-188
.
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 retighten
connections.
c. Turn bus termination ON.
d. Measure impedance between B(+) &
A(-)
ACH550 164 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.