LC Packings SWITCHOS II User Manual page 70

Advanced microcolumn switching unit

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Table Of Contents

Table of Contents

Maintenance and Troubleshooting

TABLE 6-2 Troubleshooting the Switching Valves

The Switchos does not

respond to any signal

applied to the INPUTS

connector

The switching valves do not

respond when pressing the

controls (push buttons on

front/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 valve A (B) switches to

position 1-2 as soon as the

instrument is set into

REMOTE control mode

LEDs 1-2 and 10-1 of Valve

A (B) are switched off or

switched on at the same

time

LED A-D illuminated at the

same time

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.

6-12

The Switchos is in LOCAL

mode, e.g. the LEDs in the

push buttons are illuminated

The Switchos is in REMOTE

control mode, e.g. the LEDs

in the push buttons are not

illuminated

The signal applied to the

SSV input has been active

for longer 1.5 sec

At the present time there is

no active input signal and

the valve is forced into

position 1-2

The Switching Valve A (B)

does not switch...

due to valve sticking, ...

clamp ring slippage,..