PFTL101A 2.0KN 3BSE004172R1

Tensiometer pressure head 3BSE004172R1

Tensiometer pressure head 3BSE004172R1

Fault Tracing Procedure The measuring equipment can be divided into four parts:

• The mechanical installation.

• The load cell. • The junction boxes and the cabling.

• The control unit (see the control unit manual). The fault symptoms indicate in which part the fault lies.

• Faults in the mechanical installation often result in an unstable zero point or incorrect sensitivity. If a fault follows something else in the process, such as temperature, or can be linked to a particular operation, it probably originates from something in the mechanical installation.

• Load cells are extremely robust and can withstand five times their nominal load in the measuring direction. If a load cell has nevertheless been so overloaded that its data have been altered, this is probably due to an event in the mill, such as web/strip breakage. On excessive overload the first thing that happens is that the zero point shifts.

• Problems such as interference or unstable zero point may be caused by wiring faults. Some malfunctions may be due to the proximity of cables that cause interference. Incorrect installation, such as imbalance in a cable or screens earthed at more than one end may cause the zero point to become unstable. Cables are subject to mechanical wear, and should be checked regularly. The junction box should also be checked, especially if it is subject to vibration.

• A fault in the control unit usually causes intermittent loss of a function. It is unusual for the control unit to cause stability problems. Faults in connected units may affect the operation of the control unit. For further details see the control unit manual.