Aalborg SDPROCs User Manual
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47
INDICATION
LIKELY REASON
REMEDY
Lack of reading or
output
Power supply off
Check connection of power supply
Connector off
Check all cables for proper connection to the SDPROC
and the mass flow transducer
Transducer problem
Refer to the mass flow transducer manual
Fuse blown
Disconnect power cord from AC supply; see section f
for fuse replacement
REMOVE CAUSE OF SHORT CIRCUIT!
In the Main Display,
the flow reading is
terminated with the
asterisk character [*]
Not calibrated ADC
Perform ADC calibration procedure (see section g.2)
In the Set Point status
screen, the set point
value is terminated
with the asterisk
character [*]
Not calibrated DAC
Perform DAC calibration procedure (see section g.1)
In ALL VALVES
CONTROL when
pressing CLOSE or
OPEN button the
SDPROC resets itself.
Incorrect cable or
configuration is used
on one or more channels
for Valve override control
(short circuit).
Try to locate faulty channel by connecting devices to
the SDPROC one by one. Once faulty device is located
check the 15 pin D-connector pin configuration for valve
override control (pins 8 and 12).
NOTE: Connect and disconnect any interface cable
only when the SDPROC is powered off.
Mass flow controller
does not respond to
set point adjustment
15-pin interface cable is
incorrect type or not
connected to the correct
channel of the SDPROC
Check if correct type of the interface cable is used.
Check if the interface cable is connected to the
corresponding channel of the SDPROC.
Reference for Set Point is
set to EXTERNAL
Check the Reference mode for the corresponding
channel and if required change it to INTERNAL.
The Valve control mode is
set to CLOSE
Check the Valve control mode for the corresponding
channel and if required change it to AUTO.
No inlet pressure for the
mass flow controller.
Apply required inlet pressure to the mass flow
controller.
J.2 Trouble Shooting Guide
J.3 Technical Assistance
Aalborg
7 Instruments will provide technical assistance over the phone or e-mail to
qualified repair personnel. Please call our Technical Assistance at 845-770-3051.
Please have your Serial Number and Model Number ready when you call.
The e-mail address for technical assistance is: support@ aalborg.com.
For best results it is recommended that the instruments are returned to the factory
for servicing. See section a.3 for return procedures.