Aalborg PWE Digital - Manual (Page 77)

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No INDICATION LIKELY REASON SOLUTION
5 LCD Display flow reading
and 0-5 Vdc output voltage
do correspond to the
correct flow range, but 4-20
mA output signal does not
change (always the same or
reading around 4.0 mA). External loop is open or load
resistance more than 500
Ohm. Check external connections to pins
L and K of the 12 pin M16 connec-
tor. Make sure the loop resistance
is less than 500 Ohm.
Flow output 4-20 mA schemat-
ic is burned out or damaged. Return PWE to factory for repair.
6 LCD Display temperature
reading and 0-5 Vdc out-
put voltage do correspond
to the correct flow range,
but 4-20 mA output signal
does not change (always
the same or reading
around 4.0 mA). External loop is open or load
resistance more than 500
Ohm. Check external connections to pins
M and K of the 12 pin M16 connec-
tor. Make sure the loop resistance
is less than 500 Ohm
Temperature output 4-20 mA
schematic is burned out or
damaged. Return PWE to factory for repair.
7 Fluid flows through the PWE
meter and Paddle Wheel is
turning, but LCD Display
reading and the flow output
voltage 0-5 Vdc signal do
not respond to flow. The fluid flow rate is below set
Low flow cut-off value. Check settings for Low flow cut-off
value and make required
adjustment.
Sensor or PC board is
defective. Return PWE to factory for repair.
8 Fluid flows through the
PWE meter and Paddle
Wheel is turning, but LCD
Display reading and the
flow output voltage 0-5
Vdc signal do not respond
to flow. There is no pulse
output signals from pin C
of the 12 pin M16
connector. PWE magnetic sensor is
defective Replace PWE magnetic sensor.
Paddle Wheel magnets are
defective Replace PWE Paddle Wheel
9 The Temperature reading on
the LCD and analog 0-5 Vdc
or 4-20 mA is not correct
(out of the device measure-
ment range: -10 to 70C) RTD connector got loose and
is not connected to the PCB
board. Check RTD connector, make sure it
is firmly attached to the header J2
on the PCB.
RTD sensor is defective Replace RTD sensor
10 The PWE Diagnostic Alarm
Event with code
0 – “CPU Temp. High” is
active.
MCU temperature is too high
(overload). Disconnect power from the PWE.
Make sure the ambient temperature
is within specified range (below 70°
C). Let the device cool down for at
least 15 minutes. Apply power to the
PWE and check Diagnostic Alarm
Event. If overload condition will be
indicated again the unit has to be
returned to the factory for repair.
11 The PWE Diagnostic Alarm
Event with code F - “Fatal
Error” is active.
Fatal Error (EEPROM or SRAM
corrupted) Cycle the power on the PWE. If
Diagnostic Alarm Event with code F
indicating again the unit has to be
returned to the factory for repair.