TROUBLESHOOTING
8-7
2. Block the gas inlet and watch the pump current
readings increase. Write down the blocked reading. If
the pump current reading does not increase significantly
(i.e. more than 10 counts), then there may be a leak in
the gas inlet or the pump is weak or defective. Press the
[MODE]
key one more time, the display should show
the message “Stall yyy”.
3. Use the
[Y/+]
or
[N/-]
key to increase or decrease the
stall value until it is the average of the maximum block
count and the maximum normal (unblocked) count.
Press the
[MODE]
key to exit this display. If the
threshold value is changed, a message “Save?” will
appear. Press
[Y/+]
to confirm the change,
[N/-]
or
[MODE]
to abandon the changes.
8) Motor Drive
This display allows the user to adjust the pump drive and
thus alter the pump flow. Normally, the user should not
adjust this parameter. Only minor changes are possible
and the flow is not linear with the Mdrv value.
9) DAC Output Counts
The menu allows the user to check the DAC analog output
using the
[Y/+]
and
[N/-]
keys. The remote alarm output
signal on the serial interface cable is deselected and the
analog output signal is selected in its place. This signal has
a range of 0 to 2.5V in 4096 steps. The initial default
output is 2048, or 1.25V. See Figure 8-1for signal pin-out.
The user can attach a voltmeter to check the analog voltage
output. (Adjustment of the DAC range is done in the
normal program mode).
