Use In Potentially Explosive Atmospheres; Thermal Motor Monitoring; Cable Harness For The Connection Of The Actuator To The Electronic Unit - ABB EBN861 Operating Instruction

EBN853 / EBN861 ELECTRONIC UNIT | OI/EBN853/EBN861/EX-EN REV. C

2 Use in potentially explosive atmospheres

DANGER
Explosion hazard due to improper installation!
An explosion hazard is present when installing the electronic
unit in potentially explosive atmospheres.
The electronic unit must only be installed and operated
outside of potentially explosive atmospheres.
Before the commissioning of the electronic unit, observe the
following points:
• The electronic unit must not be installed or commissioned in
an Ex area.
• Check whether the actuator is connected to the right
electronic unit, see section Electrical data for inputs and
outputs on page 27.
• Check whether the associated electronic unit has been
configured using the correct actuator parameters. To do this,
check the relevant information on the name plate of the
actuator and the electronic unit with respect to actuator
type, ambient temperature range of actuator, and NL
number, if applicable.
• On delivery, the positioning time-out function of the
electronic unit associated with the actuator is activated.
Deactivating this setting is not permitted.
• Rapid traverse mode is not allowed to be used on Ex
actuators. Therefore, it is not possible to select it via the user
interface.
• Activating the breakaway function is not permitted.
• Activating the 'Position dependent switch-off' function with
2 × torque/force is not permitted.
• The Contrac electronic unit must be upstream of the motor
temperature monitoring unit SD241-B or a similar, certified
tripping unit.

Thermal motor monitoring

In Contrac control actuators for use in potentially explosive
atmospheres, additional independent monitoring of motor
temperature is required.
Monitoring can be performed using the ABB SD241-B monitoring
unit or a comparable certified tripping unit for thermistor
temperature sensors.
The motor temperature monitoring unit interrupts the power
supply as soon as the motor temperature up-scales the
permissible limit value.
Change from two to one column
Cable harness for the connection of the
actuator to the electronic unit
Installation information on the cable harness for actuators in
Ex design
The electrical connection between the Contrac electronic unit
and the Contrac actuator can be established using the cable set
(order code 695). The cable harness is not part of the Ex
prototype test certificate and must therefore be tested for
safety-relevant functionality within the complete installation by
the installer or operator.
If the specified cable harness does not meet all safety-relevant
requirements, the proper installation material must be used.
For the specified motor connection cable, the shielding must be
connected at both ends and connected with protective ground.
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