Adam Luna LAB 124 e, Руководство по эксплуатации

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© Adam Equipment Company 2021
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16.1 TROUBLE-SHOOTING GUIDE.
BALANCE DOES NOT FUNCTION
Problems
Possible causes Suggestions
The balance is dead when
power is applied Power supply failure Check adapter is working
Check adapter is correct for the balance
Normal adapter is 18VDC, 830mA.
*Power supply circuit board failure
*Short circuit on any circuit board
The display does not turn
on but the calibration
motor moves when power
is applied Power is getting to
balance, display is
not working *Display cables may be faulty
*Display module failure
The display stays on the
initial test screen when
power
is applied.
Calibration weight motor
is on.
Unstable balance
Balance not working
correct
Power supply *Check if balance is stable by using service
menu and view A/D values
Put draught shield over pan
Check power supplies
BALANCE WORKS BUT IS NOT STABLE
Balance is unstable by a
few divisions
Noise or vibration
from environment
Friction in
mechanics Check the balance is positioned correctly to
avoid vibration, wind or air movement, it is on
a solid table, It is not near sources of heat or
cool air,
Check balance with weights if problem occurs
when sample is used. Static electricity on the
samples can cause drifting and instability.
Check the area around the weighing pan for
hair, dust, obstructions under the pan,
*A complete inspection of the mechanics to
look for sources of friction may be needed.
Balance is very unstable
and
does not weigh
correctly
Mechanical
problems
Balance
programming
Electronic problems
*A complete inspection of the mechanics to
look for sources of friction.
*Verify the A/D is also unstable. If the A/D is
OK then suspect the programming of the
balance. Reset parameters, check linearity
and redo the calibration.
Some electronic problems can also cause this.
But all mechanical problems must be resolved
first.
BALANCE IS NOT ACCURATE
You must have accurate and trusted weights to test a balance. If you suspect that the balance is
not accurate then you must know your weights are accurate. A balance calibrated using a bag of
flour is not accurate even if it works OK otherwise.
Balance is not accurate
Repeatability
Eccentric loading
Linearity
Verify the balance shows the same value when
the same mass is placed on the centre of the
pan for a few tests.
Verify the balance shows the same reading
(within a tolerance depending upon the model)
when a mass is placed at positions around the
pan.
Verify the balance is acceptable throughout
the weighing range. The balance must give
acceptable readings from low weights up to the
capacity.