Stahl MT 7 Series, Operating Instructions Manual

Page: 27 / 44

Operating Instructions MT-xx7 Safety information
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R. STAHL HMI Systems GmbH / OI_MT_xx7_en_V_01_02_14.docx / 06.12.2019 Page 27 of 44
10.2.2 Tightening torque
10.2.2.1 Terminals
The stipulated tightening torques of the connection terminals must be
observed and applied. Again, they must be checked and possibly
adjusted before commissioning !
10.2.2.2 Cable glands
The tightening torques for the cable glands may vary depending on the cables and wires used.
The users have to determine and apply the required torques themselves. In the case of ex-
factory systems, all components are installed correctly and in accordance with applicable
standards. Since storage or temperature etc. can have an impact on the cables and cable
glands, the pre-installed screw connections must be checked and possibly tightened before
commissioning.
If they are too loose or too tight, the type of protection, sealing or strain relief might be
negatively impacted.
Cable glands with cap nut and without strain relief clamp should only be used for permanently
installed cables and electrical lines. Installation of the required strain relief is the responsibility of
the system set-up engineer.
10.3 Safety information for operation
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Operate the device only if it is clean and undamaged. If the device is in any way
damaged, do not touch it to avoid injury. In the case of any damage that may compromise
ingress protection (e.g. cracks, holes or broken components) the device must be taken out
of commission immediately. Before the device is recommissioned the damaged
components must be replaced.

If you want to use the device in zone 20, 21 or 22 as EPL Da/Db/Dc, dust deposita of a
thickness exceeding 5 mm must be removed and you have to ensure that no high-energy
loading mechanisms at the operating surface of the unit (e.g. pneumatic particle transport)
occur during operation. The device may not be used in environments where propagating
brush discharges may occur.
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In general, and particularly when opening and closing enclosures, users must take care
not to get injured by getting caught / trapped.

In case of non-compliance or contravention of the above explosion-protection is no longer
guaranteed and all warranty claims shall be null and void.
10.4 Special conditions
Equipotential bonding must be established for the external intrinsically safe circuits of the
accessories to be connected, e.g. display, keyboard or pointer device.
NOTICE