6. TROUBLESHOOTING
6
6
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T
T
R
R
O
O
U
U
B
B
L
L
E
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S
S
H
H
O
O
O
O
T
T
I
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N
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G
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Identify the symptom or unexpected behavior you are observing from the
SYMPTOM
list below.
A
PROBABLE CAUSE
is provided and a
SOLUTION
is proposed including references to manual
sections that provide information that may be of assistance.
This troubleshooting guide is for the AMH mass handler. For general PG7000 troubleshooting, see the
PG7000 Operation and Maintenance Manual.
Table 5
.
AMH Troubleshooting Checklist
SYMPTOM
PROBABLE CAUSE
SOLUTION
PG Terminal displays
<AMH not
responding>
.
PG7000 is unable to establish
communications with the AMH mass
handler due to incorrect cable connection
or COM port settings.
Check that the correct cables are being used
to make the interface connections between
the PG7000 and the AMH (and PPC if a
pressure controller is present), that the
cables are connected to the correct ports
and that the COM ports are set correctly.
2.3.2.4
PG Terminal displays
<AMH unable
to lift mass load ERR#122>
.
AMH mass lifter is unable to lift mass load
fully up to the mass selection position.
Drive air pressure is too low or flow to
AMH is excessively restricted.
Increase drive air pressure and improve
drive air flow conditions. 2.2.2.1, 2.3.2.1
Mass handling system will not go down
over the masses to be installed on the
platform.
Main mass columns are not in correct
position because AMH has not been
properly prepared for installation.
Perform the AMH start up/verification
procedure prior to attempting to install it on
the PG7000 Platform. 2.7
AMH masses rock back and forth
when lifted to the mass selection
position.
Main masses move when mass is in
mass selection position and main
mass selection columns are rotating.
AHM is not correctly seated on the
PG7000 Platform and is misaligned
relative to the mass load.
With AMH-100, check that there is no foreign
matter in the column holes in the platform and
the AMH column feet are fully engaged with
feet set screws tightened. 3.2.1.2
With AMH-38, check that the large O-ring on
the bottom inner circumference of the bell is
well seated and that the AMH is properly
centered on the PG7601 vacuum plate.
3.2.1.1
PG Terminal displays
<AMH unable
to rotate column motor>
and
ERR#110
,
ERR#111
or
ERR#112
.
The mass lifting shaft is not fully threaded
into the binary mass carrier or the trim
mass tray has become loose from the
mass lifting shaft.
Tighten the parts. Note that the mass lifting
shaft has a left hand thread. 3.2.1
Poor behavior of PG7000 with
symptoms such as inconsistent
indication of piston position, unstable
pressure when piston is floating.
Mechanical interface between mass bell
and piston cap is not operating well
causing bell not to seat properly on piston
when AMH lowers mass.
Check condition of piston cap and correct if
necessary, lubricate inside of bell. 2.5.1
Mass handling error occurs with AMH-
38 in absolute mode due to binary
mass selection pins being extended
when they should be retracted.
Operating with a vacuum reference in the
vacuum chamber without applying drive
vacuum to the AMH. Operating with drive
vacuum port plugged.
Apply drive vacuum to the AMH when
operating with vacuum in the vacuum
chamber. NEVER plug the drive vacuum
port. 2.3.2.2
Cannot remove bell jar from AMH-38
though there is no vacuum in the bell
jar.
When vacuum drive is applied to the AMH
without vacuum in the vacuum chamber,
vacuum may leak through the tubular
mass pin actuators and accumulate in the
vacuum chamber.
Remove vacuum drive from the AMH when
there is no vacuum in the vacuum chamber.
3.2.5
When setting pressures, PG Terminal
stops to instruct to load masses rather
than completing all mass loading
automatically.
PG7000 pressure setting resolution is set
finer than 0.1 kg.
Set PG7000 resolution to 0.1 kg. PG7000
Operation and Maintenance Manual, [RES].
PG Terminal displays a message and
<ERR #nnn>
on the bottom right hand
corner.
An AMH error has occurred.
Determine AMH error in Table 4. Reset
AMH by selecting AMH mass set or using
[SPECIAL]
,
<8AMH>
,
<2control>
,
<1loadall>
.
Page 35
© 2007 DH Instruments, a Fluke Company
