Lincoln Electric IM840 ETHERNET_DEVICENET MODULE K2436-1 - Manual (Page 23)

B-3 TROUBLESHOOTING B-3
ETHERNET / DEVICENET MODULE
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Device goes off line during welding
Analog Inputs donʼt respond or donʼt
respond quickly.
1. Current Interference
2. Termination
3. Shield
4. Power Supply
5. Expected Packet Rate
1. Analog Scans Between Updates
2. Analog In Active Selections
3. Analog Hysteresis
4. Passive Mode
1. Verify that cables are not run
along current carrying conductors.
This would include the welding
cables.
2. Verify that the DeviceNet bus is
terminated correctly.
3. Verify that the cable shielding is
correctly grounded at the bus
power supply. The shield should
be tied into the bus ground at only
one point.
4. Verify that the power supply can
supply sufficient current for the
devices on the network.
5. Verify that 1000/(Expected Packet
Rate) ≤ (scans per seconds). The
Monitor section of the Observer
application displays these values.
1. Using DeviceNet Observer select
Configuration under the
DeviceNet menu. Verify that
Analog Scans Between Updates
is 1/4 of I/O Scans/Sec value.
2. Using DeviceNet Observer select
Configuration under the
DeviceNet menu. Verify in Analog
Input Channels that the required
channels are set active.
3. Using DeviceNet Observer select
Configuration under the
DeviceNet menu. Verify in Analog
Input Channels that the
Hysteresis settings are all 0.
4. Using DeviceNet Observer select
Configuration under the
DeviceNet menu. Verify in System
Control that Enable passive mode
operation is not selected.
DEVICENET