Chapter 7 Troubleshooting
GC-2014 Service Manual
74
value is normally in the range 7,000 to 12,000. If the offset value is well
outside this range, perform offset calibration. (The method is described in
the GC-2014 instruction manual.) If the gain value is well outside this range,
obtain the correct value from Shimadzu Corporation's Quality Assurance
Department. At this time, provide notification of the serial number and lot
number displayed on the side of the AFC.
7.1.1.2 When the [Control mode] is [Total flow] and the [Split mode] is [DIRECT]:
(1) The total flowrate fluctuates.
(2) The total flowrate is lower than the setting.
(3) The total flowrate is higher than the setting.
Refer to items (1) to (3) under 7.1.1.1.
7.1.1.3 When the [Control mode] is [PRESS] or [VELOCITY] and the [Split mode]
is [DIRECT]:
(1) The pressure or the linear velocity fluctuates.
Check that [P-mode I time] = "10", [P-mode P term] = "50", and [P-mode I
term] = "100".
If not, enter these values and press the pf4 key to write them in the ROM. If
the AFC for WBI is used, the above values are as follows: [P-mode I time] =
"10", [P-mode P term] = "12", and [P-mode I term] = "10".
Check that there is no clogging in the purge-line flow line.
The inlet pressure sensor in the AFC is inside the purge line. If there is
resistance in the purge line, the pressure may fluctuate.
(2) The pressure or the linear velocity is lower than the setting.
Check for leaks in the line.
Check that the source pressure (i.e., the primary pressure) has attained a
sufficient level. The source pressure can be ascertained by viewing the
[Actual] value for the primary pressure in the [Flow Adjust] window. It is not
necessary to remove any piping. Check that the set pressure is sufficiently
higher than the primary pressure. (As a rough guide, it should be at least
200 kPa, but this value depends on the column.)
Check that [P-mode I time] = "10", [P-mode P term] = "50", and [P-mode I
term] = "100".
If not, enter these values and press the pf4 key to write them in the ROM. If
the AFC for WBI is used, the above values are as follows: [P-mode I time] =
"10", [P-mode P term] = "12", and [P-mode I term] = "10".
Check the [Offset] and [Gain] values.
The offset value is normally in the range 32,000 to 33,500 and the gain
value is normally in the range 3,000 to 6,000. If the offset value is well
outside this range, perform offset calibration. (The method is described in
the GC-2014 instruction manual.) If the gain value is well outside this range,
obtain the correct value from Shimadzu Corporation's Quality Assurance
Department. At this time, provide notification of the serial number and lot
number displayed on the side of the AFC.
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