Troubleshooting (continued)
Problem
Possible Cause
Corrective Action
DRV OUT not
responding
to an initiate
signal
(solenoid
valve does
not operate)
(continued)
Foot pedal initiate
being used with de-
bounce enabled for
rapid initiate cycles
The foot pedal initiate circuit is de-bounced for a period of 20 ms
because it is mainly intended to be used with mechanical switches.
However, if both channels need to be initiated at faster rates, the de-
bounce operation (dbnc) serial command can be used to disable the
20 ms de-bounce on the foot pedal. Refer to Appendix B, “RS-232C
Connection Technical Information.” The voltage initiate circuits, which
are not de-bounced, can also be used.
Auto Increment
switched to memory
cell with incorrect
settings
Check the settings of all memory cells within the expected range. Refer
to “Entering Memory Cell Settings” and “Setting Up the Auto Increment
Mode.”
ACT pressure
reading and
SET pressure
value not the
same
Insufficient input air
pressure
Verify that the input air pressure is above the specified SET pressure.
Controller’s pressure
regulators stabilizing
or filling reservoir
Allow sufficient time for the pressure regulators to fill the reservoir.
Controller requires
pressure calibration
Verify the readings against a standard to confirm that they are not within
specification, then perform a pressure calibration routine on the pressure
channel in question.
No pressure
on AIR OUT 1
or 2
Controller disabled
Enable the controller by pressing and holding the ENABLE/DISABLE key
(
) for 4 seconds until the controller is enabled.
MODE set to OFF on
PRESSURE screen
Verify that the appropriate pressure channel MODE is set to ON. Refer to
“Setting Up the Pressure Control.”
Tubing not fully
engaged
The AIR OUT quick-connect fittings have a stop valve. Verify the correct
and full engagement of the tubing connection to the quick-connect fitting
to allow air flow.
Flashing System
Alarm IN
Remove or disable the system alarm. The controller switches off the
pressure regulators if there is an input alarm present. Refer to “Clearing
an Alarm Input or Auto Increment Mode Alarm.”
Incorrect
heater
feedback
Incorrect
thermocouple used
Verify that a J-type thermocouple is used.
Incorrect wiring
Verify that wiring is connected to the J-type thermocouple as follows:
TC+: Iron (Fe), white
TC -: Constantan(Cu-Ni), red
Broken thermocouple
wire
Check the integrity of the thermocouple wiring.
Thermocouple
channels 1 and 2
swapped
Check the thermocouple wiring to ensure proper feedback for each
channel.
Problem with wiring
integrity
Ensure that the wiring is correctly stripped and that the conductors are
making contact with the screw terminal connector.
Continued on next page
ValveMate 9000 Controller
57
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