Dionex AXP/AXP-MS Manual
16
The motor stall detector is enabled or disabled during power-up by
pressing and holding the RUN/STOP and the PRIME buttons while
the power is switched on. Release the buttons when the display reads
SFE. To enable the motor stall detector, press the up arrow button and
the display will read ON. To disable the motor stall detector, press the
down arrow button and the display will read OFF. To exit this mode
and store the current setting in nonvolatile memory, press the
RUN/STOP button.
The motor stall detector uses a timer to determine if the camshaft has
stopped turning or if the refill switch is defective. The timer begins
timing after the pump accelerates or decelerates to its set point flow
rate. If the motor stall detector has been enabled, and the camshaft
stops turning or the refill switch stops operating, the fault will be
detected between the time it takes to complete one to two pump cycles.
A pump cycle is defined as the time it takes for the camshaft to
complete one complete revolution. One revolution of the camshaft
produces a delivery phase and a refill phase. Each specific flow rate
has a corresponding cycle time: the cycle time is approximately
30 seconds at 0.1 mL/min, 3 seconds at 1.00 mL/min, and 0.3 second
at 10.00 mL/min.
The fault is canceled by using one of the following methods: (1) by
pressing the RUN/STOP button on the front panel, (2) by sending a
stop command (ST) via the serial communications port on the rear
panel, or (3) by connecting the PUMP-STOP input to COM on the rear
panel, or removing the connection between the PUMP-RUN input and
COM if the PUMP-STOP input is permanently jumpered to COM on
the rear panel.
4.2.4 Remote Interfacing
An RS-232C modular jack is provided on the rear panel. To control
the pump
using Chromeleon version 6.80 (or later), connect the pump
to the serial or USB port on the Chromeleon PC, using the cables
included in the Ship Kit. When connecting to a USB port, the driver
provided with the serial-to-USB adapter must be installed on the PC
before the converter cable is attached to the USB port. See Section 7
for details on connection and operation.
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