32
HE 5712 Operating Instructions
# 372048 | Version 1.4
8.
Error Messages
Display
Cause
Troubleshooting
The differential
pressure display
shows
“_ _ _“
The differential pressure signal is
below the permissible measuring
range
Check differential
pressure
Check external screw
connection
The differential
pressure display
shows
“¯ ¯ ¯“
The differential pressure signal is
above the permissible measuring
range
Check differential
pressure signal
Check external screw
connection
The LED
flashes. The
display shows the
relevant valve
No current flows through the valve line
Check the wiring to the
indicated valve for
interruption.
Check the valve in
question.
Check if the valve plug is
connected correctly
The LED
flashes. The
display shows the
relevant valve
The permissible valve current of 1 A
has been exceeded
Check the wiring to the
indicated valve for
interruption.
Check the valve in
question.
Check if the valve plug is
connected correctly
The High-Alarm-
LED
flashes
The differential pressure exceeds the
set threshold
Adjust the set pulse and
pause times
Check filter element
Check solenoid valves
for proper mechanical
function
Check compressed air
system
The Low-Alarm-
LED
flashes
The differential pressure falls below
the set threshold for longer than 5
minutes without reaching the post-
cleaning threshold
Adjust the set pulse and
pause times
Display is dark or
lights up briefly
and goes out
again immediately
The internal fuse triggers (After a
recovery time of a few minutes, the
controller can be switched on again)
Switch off the operating
unit
Check whether the
ambient temperature is
above the permissible
value.
Check the ratio of pulse
to pause time.
Check current
consumption of solenoid
valves Observe
restrictions.
Post-cleaning
does not work
No signal at post-cleaning input
Precoating function active
Differential pressure has not risen
above the lower cleaning
threshold.
Disable precoating see
chapter
