Manual

32 Appendices
Appendix B – PLM Display Codes
Warm-up Codes
C-6 Sensor Protection Shutdown. The C-6 state is entered when the PLM
can not pump enough current into the pump cell to balance the sense cell.
When C-6 is entered pump current is turned off. The PLM will try to gain control
of the sensor (the C-1 state) every 10 seconds. If it is then unable to regain
control after 2 seconds then it will re-enter the C-6 state.
C-5 User Stop. The sensor has been turned off via a digital input
C-4 No Heater detected. This will occur if the sensor is disconnected or the
heater is open circuit – ie: the sensor is damaged. Heater circuit should be
approx 3ohms at room temp
C-3 Warm Up. The PLM is heating the sensor prior to normal operation and
waiting for sensor to warm up.
C-2 Control Initialization. Waiting to start pump current
C-1 Checking Operation. Waiting to get control of sensor cell voltage.
In normal operation the PLM will display C-3, C-2, C-1 then start reading lambda
values. The C-4 and C-6 error states will occur if a problem is detected.
Error Codes
0010 The config loaded into the PLM does not match the PLM firmware version
0011 The config stored in the PLM is corrupt (CRC failure)
0020 The factory calibration values does not match the PLM firmware version
0021 The calibration stored in the PLM is corrupt (CRC failure)