LC Packings SWITCHOS II, User Manual

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Maintenance and Troubleshooting
6-12
D850R3
User’s Manual Switchos II
TABLE 6-2 Troubleshooting the Switching Valves
The Switchos does not
respond to any signal
applied to the INPUTS
connector
The Switchos is in LOCAL
mode, e.g. the LEDs in the
push buttons are illuminated
Change control mode to
REMOTE (REMOTE/LOCAL
switch on the rear panel)
The switching valves do not
respond when pressing the
controls (push buttons on
front/rear panel)
The Switchos is in REMOTE
control mode, e.g. the LEDs
in the push buttons are not
illuminated
Change control mode to
LOCAL (REMOTE/LOCAL
switch on the rear panel)
The Solvent Selection valve
moves to the next solvent
channel, and after a short
moment it moves back to
channel A (REMOTE control
mode)
The signal applied to the
SSV input has been active
for longer 1.5 sec
Apply a shorter signal
(< 1.5 seconds)
The valve A (B) switches to
position 1-2 as soon as the
instrument is set into
REMOTE control mode
At the present time there is
no active input signal and
the valve is forced into
position 1-2 Change the setting of the
instrument controlling
Switchos according to the
needs of the application
The Switching Valve A (B)
does not switch…
Switch OFF the instrument
and ON again to reset the
error
due to valve sticking, … Clean Valve
clamp ring slippage,.. Tighten clamp ring
LEDs 1-2 and 10-1 of Valve
A (B) are switched off or
switched on at the same
time
other positioning problems
Contact LC Packings
The Solvent Selection Valve
does not switch…
Switch OFF the instrument
and ON again to reset the
error
due to valve sticking, … Contact LC Packings
clamp ring slippage,.. Contact LC Packings
LED A-D illuminated at the
same time
other positioning problem Contact LC Packings
Note: It is important to note that many analytical problems are be caused by
external influences such as the temperature and or the analysis of light sensitive
samples and are not instrument related. When troubleshooting, make certain that
the application was running in an acceptable fashion before the problems were
observed and that nothing has been changed in the application. If you are making
a change in the protocol, change a single parameter at a time and ensure that the
effect of each change is well understood.