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9.3.2 Current Loop Communications Failure
Use terminal mode to
check SEP comms.
See sub-section 6.2.1.4
for terminal mode
No
Comms
OK?
Yes
LED or wiring failure.
Repair as necessary
Look for 240V instead
if your SEP operates
from a 240V supply
Figure 9-6: Communications failure – CHART 1
DPN 402196 Issue 4.1
Communication
failure
Is SDC
Yes
COMMS
No
LED on?
Power-off the System.
Disconnect the SEP
Power/Comms cable
Continuity check the
cable and umbilical
Connect AC voltmeter
across pins 1 & 3
Power-on the System
110V
No
±20%
OK?
Yes
Power-off the System
Reconnect the SEP
Power/Comms cable
Go to CHART 2
© Teledyne TSS
9 – Maintenance
Check the mains
power supply source
9- 13
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