Heating Unit - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

NGA 2000 MLT Hardware
TEST PROCEDURE / TEST POINTS

HEATING UNIT

11.2 Heating Unit
Test point:
Measuring instrument:
Signal:
Failure:
Possible reason:
Fig. 11-4: PCB "BHZ" (position of signal LED's / heating transistors)
11 - 6
PCB "BHZ" (Fig. 11.4) of heater unit (Fig. 1-21. 1-24 and 1-27)
optical
red LED's of heater transistors must be off
green control LED must be blinking
red LED is on / green LED is out
Heater transistor defective (exchange PCB "BHZ")
Check voltage supply of BHZ
Check "all internal connections"
LED "red"
LED "red"
Instruction Manual
PCB "BHZ"
(heating transistor 3) (heating transistor 4)
(heating transistor 1) (heating transistor 2)
Emerson Process Management GmbH & Co. OHG
90002929
07/2006