3510/3510KP/3512/3512KP System Manual
3-34
Cable Connections
Division 2 hazardous location regulations require that all cable connections be
provided with adequate strain relief and positive interlock. Never connect or
disconnect a cable while power is applied at either end of the cable.
Communication Cable Interface
All communication cables should include a chassis ground shield. This shield should
include both copper braid and aluminum foil. The D-sub style connector housing
should be a metal conductive type (e.g., molded zinc) and the ground shield braid
should be well terminated directly to the connector housing. Do not use a shield
drain wire.
The outer diameter of the cable must be suited to the inner diameter of the cable
connector strain relief in order to ensure that a reliable degree of strain relief is
maintained. Always secure the D-Sub connectors to the workstation mating
connectors via the two screws located on both sides.
Warning
Never connect or disconnect the communication cables while power is
applied at either end of the cable. This may result in an incendiary spark.
Permanent damage to the workstation communication components may
occur.
Operation and Maintenance
The systems have been designed for compliance with relevant spark ignition tests.
However, please note that the workstation front panel contrast adjustment tactile
switches and keyboard connector are the only make/break components intended to be
exercised by the operator in the course of normal operation.
Warning
In order to maintain a safe condition, never use an external keyboard or
mouse when the unit is operating in the presence of a hazardous
environment.
With respect to Hazardous Location installations, always observe the following rules:
1.
Always install the workstations within an enclosure suitable for the specific
application. General purpose enclosures may be acceptable for Class I
applications but are never acceptable for Class II applications. Type 4 (IP 65)
enclosures are recommended even when not required by regulations.
2.
If present, keep enclosure doors or openings closed at all times, to avoid the
accumulation of foreign matter inside the workstation.
