Maintenance; Preventive Maintenance - Honeywell 854 ATG Series Instruction Manual

5

Maintenance

5.1 Preventive maintenance

Whether maintenance is needed can be checked with the following tests:
Repeatability test
(refer to section 4.2).
If repeatability deteriorates (more than 1 mm) the drum bearings should be replaced (refer to section
5.3.3).
Balance test
The measuring drum unbalance can be measured by the following procedure:
Item Name
LT Lock test
FR Freeze
BT Balance test
BU Maximum unbalanced
weight
BV Minimum unbalanced
weight
UN Unlock
Calculate the maximum measuring drum unbalance as: (BU - BV).
The drum unbalance should be within 3 grams. When the drum unbalance is more, check for contamination
of the drum. If the unbalance is still more than 3 grams replace the drum bearings (refer to section 5.3.3).
Displacer weight
The weight of the displacer can be measured with the following procedure:
Item Name
LT Lock test
FR Freeze
MF Measure frequency
WQ Weight request
UN Unlock
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Description
Raise the displacer for approximately 0.6 m (2 ft) above the product
level.
Stop the lock test and wait till the displacer is in a complete rest (one
or two minutes).
With this command the balance of the measuring drum is checked.
This measurement takes approximately 5 minutes. When the balance
test is ready, the status on the display changes from BT into FR.
Standard floating point format; units: grams.
Request for the maximum unbalanced weight.
Standard floating point format; units: grams.
Request for the minimum unbalanced weight.
Cancel the lock test command.
Description
Raise the displacer for approximately 0.6 m (2 ft) above the product
level.
Stop the lock test and wait till the displacer is in a complete rest
(one or two minutes).
Measure the frequency of the force transducer. It is ready when the
status on the display changes from MF into FR.
Standard floating point format; units: grams. Request for the displacer
weight.
Cancel the lock test command.
Maintenance