Cosmo LS-R700 User Manual

126 9 Troubleshooting
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There are two types of the causes for the negative fails. One is caused by a pressure rise in WORK-side circuit and
the other is caused by a pressure reduction in the MASTER side circuit.
Follow the procedures below to identify the cause of the frequent fails and remedy the problem.
1 Perform a No-Leak Check with the stop valves on the rear panel closed.
If the LS-R700 is not leaking, the cause of the frequent fails is something else. Proceed to the next item to check.
Contact Cosmo for repair if internal leak is found.
2 By a pressure rise in WORK-side circuit
Probable Cause Treatment
Sealing is not stable. Check the follows:
• Whether there is enough clearance between the sealing material and
the groove.
• Wear of the stopper
• Whether the size and hardness of the sealing material are appropriate
• Whether the thrust force of the cylinder is too high
A rise in temperature of the air inside
the tested part due to the
temperature rise of the cold tested
part trying to match the ambient
temperature.
Let the part temperature be ambient by adding a cooling/warming buffer in
the production line.
If the part is wet, add or improve the drying process.
Proceed to the next item to check if the problem persists without identifiable.
3 By a pressure reduction in MASTER side circuit
Probable Cause Treatment
There are leaks from the Master or
the fittings on the MASTER side.
Check Master part and the fittings for possible leaks.
Replace the Master part and fittings if leaks are found.
Deformation of MASTER side tube Replace it with tube that is rigid enough not to deform.
Adiabatic compression effect of the
Master
The size of the Master Chamber may be wrong, or the BAL2 timer may
be too short.
Replace the master to the one with good temperature stability.
Extend BAL2 timer if possible.
Proceed to the next item to check if the problem persists without identifiable.
4 By over compensation
Probable Cause Treatment
The current compensation value
may not be suitable for the current
environmental condition.
Update the compensation value.

Cosmo LS-R700 Specifications

General

Brand	Cosmo
Model	LS-R700
Category	Test Equipment
Language	English