8 • DP/SP Troubleshooting
Doc. 065031-04 1/08 197
blockage (i.e., the rotor seal or stator may need to be replaced). Contact
Dionex for assistance.
8.13 DP/SP Does Not Start
• Power is off
Check that the main power switch on the DP/SP rear panel is turned on.
Press the
POWER button on the front of the DP/SP to turn on the pump.
• Flow rate is set to zero
Select a Flow rate on the Chromeleon or Chromeleon Xpress Control panel.
• While being primed, pump starts briefly and an alarm sounds
If the high pressure limit was tripped, check that the priming valve on the
secondary pump head is opened (see Figure 2-3
). To open the valve, turn the
knob one-half turn counterclockwise.
If the low pressure limit was tripped:
1. Verify that the Minimum Pressure setting is several hundred psi below
the Current Pressure reading on the Chromeleon or Chromeleon Xpress
Control panel.
2. Make sure there are no liquid leaks in the flow system.
3. Make sure the priming valve is closed (see Figure 2-3
). To close the
valve, turn the knob clockwise until closed. Tighten no more than
fingertight.
Do not use any tools to tighten the priming valve! Overtightening may
destroy the cap seal. Open or close the priming valve only when the
system pressure is down.
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