Instruction manual

NGA 2000 MLT Hardware
TROUBLESHOOTING
10 - 5
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
10.3.6 Heater Unit Regulation
Possible Causes Check / Correct
a) PCB “BHZ” failure Check PCB “BHZ” (Section 11.2)
b) Voltage supply absent Check voltage supply
(Section 10.1 / 11.1.1)
10.3.7 Temperature Measurement
Possible Causes Check / Correct
a) Chopper not or not correct connected Check connection of Chopper → PCB “PIC”
to PCB “PIC”/“DSP” (Fig. 1-20) or Chopper → PCB “DSP” (Fig. 1-33)
b) Temperature sensor not or not correct Check connection of sensor → PCB “PIC”
connected / defective (Fig. 1-32, P10 / P20) or
(temperature shown in display not in sensor → PCB “DSP” (Fig. 1-21).
a range of + 15 °C to + 70 °C)
Exchange temperature sensor
(Fig. 17-2, Item 3)
10.3.8 Invalid Pressure Measurement
Possible Causes Check / Correct
a) Instrument without pressure sensor Check wether software parameter
“pressure measurement” is set to
“manual measurement”.
Check, that correct pressure value is entered.
b) Pressure sensor not or not correct Check connection of sensor → PCB “PIC”
connected / defective (Fig. 1-32, P1 / P9) or
(pressure show in display not in sensor → PCB “DSP” (Fig. 1-33)
a range of 800 hPa to 1,200 hPa)
Exchange pressure sensor.
DISPLAY MESSAGES