User’s Manual – 400E Series
Page 18
Troubleshooting DCU
Note that there are
three
troubleshooting screens for the DCU.
Below is screen one.
Supply
The two power supplies are listed,
with information about voltage and
supply selection.
The DCU automatically select its power
from either the primary or the
secondary supply.
In the above example, the secondary
supply is low, so the DCU selected the
primary power.
Switch
For each of the eight switch channels,
this section indicates if the switch is
open (0V) or closed (24V input).
If for instance the troubleshooting
screen indicates open, and there is a
24V signal connected to the input
channel, then that input channel is
broken.
4-20mA
There are four channels on the DCU.
For each of the channels, there is an
indication for:
Value, in configured unit (if any)
Value, in mA
Broken wire (if <2mA)
