IM-P402-139
AB Issue 1
13
Symptom
Explanation
Action
1
Light flashing
red repeatedly
and
alarm output
Program integrity
The product program has
been corrupted.
1.
2.
Return product to your local
Spirax Sarco representative.
Before installing a
replacement product, follow
the actions in Section 7.1
'Generic faults'.
2
Light flashes
red 2 times
repeatedly
and
alarm output
Level input was too low
The measured level signal
from the LP20 was too low.
1.
2.
3.
4.
Check probe installation.
Check the connection
between the LP20 and
vessel.
Check the connection
between the probe and the
preamplifier.
Before installing a
replacement product, follow
the actions in Section 7.1
'Generic faults'.
3
Light flashes
red 3 times
repeatedly
and
alarm output
Level input was too high
The measured level signal
from the LP20 was too
high.
1.
2.
3.
4.
5.
Check probe installation.
Check the distance between
the probe and any metal
work.
Check the connection
between the probe and the
preamplifier.
Verify the insulation on the
LP20 has not been damaged.
Before installing a replacement
product, follow the actions in
Section 7.1 'Generic faults'.
7.2 System alarms
When an alarm occurs, the light will flash red and set the current output to the alarm state.
See technical data section. To assist in diagnosis, the light flashes in a continuous sequence,
separated with a pause. The alarm can be cleared by power cycling the product, once the
fault is corrected
Summary of Contents for PA420
Page 2: ...IM P402 139 AB Issue 1 2...
