LEYBOLD 230070V02, Operating Manual

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32 300544652_002_C1 - 11/2016 - © Leybold
Troubleshooting
Symptom Possible Cause/Remedy
No digital communication - Check electrical connections (3 wires from transmitter to
communication equipment)
- Transmitter and communication equipment baud rates have
to match
- Use of incorrect transmitter address. Try address 254
- Attention characters missing (@)
- Termination characters missing (;FF)
NAK180 is received when
transmitting setpoint commands
- The transmitter setup is locked. Refer to disable lock
procedure in the communication protocol.
Incorrect pressure value - Other gas present than transmitter gas setting or trace of
gas.
- Contaminated sensor. Transmitter repair required.
- Corroded sensor. Transmitter repair required.
- Perform a zero adjustment/FS adjustment.
- Check Setting of Controller or display.
Incorrect pressure value at low
pressure - Contaminated sensor. Transmitter repair required.
- Corroded sensor. Transmitter repair required.
- Incorrect zero adjustment has been executed.
- Transmitter exposed to heat or cooling air stream.
- Perform a zero adjustment.
Incorrect pressure value at high
pressure. - Contaminated sensor. Transmitter repair required.
- Corroded sensor. Transmitter repair required.
- Incorrect FS adjustment has been executed.
- Other gas or gas trace present than transmitter gas setting.
- Perform a FS adjustment.
Cold cathode does not provide
measurements - If the cold cathode is turned on at low pressure <1.00E-7
mbar or is contaminated a delay can occur from turning on
high voltage to the ionization begins. At low pressure the
delay can be several minutes.
Cold cathode value is lower than
actual pressure - If the cold cathode sensor has been operated a too high
pressure or exposed to fast pressure cycles the sensor can
be sputtered. Sputtering of sensor will normally provide
lower reading than actual pressure.
Setpoint relay does not trip - Setpoint not enabled.
- Setpoint value not set to proper value.
- Setpoint direction is different than the user expects.
- Check electrical connection.
- Check part number to see if transmitter has setpoint relays.
No analog output - Power supply turned off.
- Check electrical connections.
Status LED illuminating red - Sensor element defect.