Hardware Setup 2-15
XP 3000 Without Valve
The XP 3000 without valve is available in an RS-232/RS-485 or CAN/RS-485
configuration. It uses the same components and operates the same as the XP 3000 with
valve, except that it does not contain a valve, valve motor, or valve encoder. Syringes are
attached using a Kel-F block which replaces the XP 3000 valve. The block has a “Y”
configuration with input and output port (available in 1/4-28 or M6 fittings) and a 1/4-28
screw fitting for the syringe. Valveless pumps use the same syringes as pumps with
valves.
NOTE When using a valveless pump, remove the additional jumper and set JP4 to
pins 2 and 3.
The XP 3000 without valve uses the same commands as the XP 3000 with valve with the
exception of the initialize command, valve commands and valve overload error. For more
information on the commands, see Chapter 3, “Software Communication.”
NOTE Valveless pumps require a system valve external to the pump. They are
commonly used with other Cavro devices.
During power-up, the valve initializes. The valve encoder will make a complete
revolution in a clockwise direction. The valve stops at the left-hand port (as viewed from
the front of the pump). If the valve is at another position during power-up, the encoder
will turn clockwise to the left-hand port, then it will make a complete revolution. The
syringe plunger does not move.
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