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Temposonics
MH Series
®
Installation Manual
6. Transport, intermediate storage
When transporting the cylinders, make sure that the cables and connectors are not under tensile stress. When handling/storing carelessly, connec-
tors and cables can be squeezed easily between stacked cylinders.
Moreover, it is necessary to encapsulate the connections or exposed cable ends using an antistatic bag. For this, the original bags (MTS material
number V0108) can be re-used. Furthermore, it is important to re-fit the white dust protective caps (MTS material number GZ0605) on the MTS
IP69K connector system after installation of the connector. The cylinders storage conditions should be as dry as possible.
6.1 Mounting/dismounting cylinders on mobile hydraulics machines
As during transport, connectors, cables and cable ends should be protected sufficiently during mounting and dismounting. Cables and conductors
must be neither subjected to load or tensile stress, nor bended. When connecting cables are installed, make sure that the insulation is not damaged
by sharp edges.
6.2 Electrical and electrostatic effects
Insulation tests
Part of the tests performed on mobile machines can be insulation tests. These tests are intended to determine the dielectric strength of
the cables against the housing (insulation resistance) using high voltages. During these tests, all sensor cables must be disconnected,
otherwise stray voltage over the sensor protective circuitry against ground can damage these components and cause sensor failure.
Welding
After installation of the cylinders in machines, welding work on adjacent components may be necessary. If the grounding tong is applied too closely
to or even directly on the cylinder, welding currents can be transmitted to the sensor via the cylinder, which can cause melting of the sensor pipe or
damage of internal sensor components.
Cylinders mostly consist of two assemblies: the lower part with the cylinder pipe (Figure, shown in dark gray) and the piston with the piston rod
(light gray).
These components are isolated electrically from each other by gaskets, bearings and slide rails, i.e. normally, no current flow is possible.
With long sensors, however, the sensor pipe can sag due to its own weight and touch the wall of the piston rod borehole. In this case, there is an
electric connection. The entire welding current flows through the sensor pipe and the sensor head and damages the electronics.
Therefore, the instructions given below must be followed:
• Cut or disconnect all sensor connections during welding.
• Never fasten the grounding point at the piston rod or at the cylinder pipe.
• Never weld on a part of the cylinder, if a sensor has been installed.
• Never perform welding work near a cylinder, if a sensor has been installed.
• Due to insulating bearings, plastic slide bearings or grease in the contacts points, electric potentials can build
up at every bearing point of machines. Accordingly, similar effects as on hydraulic cylinders.
As a rule:
Don't perform welding work on the cylinder!
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