Electrical Connections; Protection Of The Transmitter From Damage Caused By Highly Energetic Electrical Interferences - ABB TTF200 Operating Instruction

16 TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. A

6.3 Electrical connections

DANGER
Improper installation and commissioning of the device
carries a risk of explosion.
For use in potentially explosive atmospheres, observe the
information in chapter 'Use in potentially explosive
atmospheres according to ATEX and IECEx' on page 6 !
Observe the following information:
— The electrical connection may only be made by
authorized specialist personnel and in accordance with
the electrical circuit diagrams.
— The relevant regulations must be observed during
electrical installation.
— The electrical connection information in the manual
must be observed; otherwise, the type of electrical
protection may be adversely affected.
— Safe isolation of electrical circuits which are dangerous
if touched is only guaranteed if the connected devices
satisfy the requirements of DIN EN 61140
(VDE 0140 Part 1) (basic requirements for safe
isolation).
— To ensure safe isolation, install supply lines so that they
are separate from electrical circuits which are
dangerous if touched, or implement additional isolation
measures for them.
— Connections must only be established in a dead-voltage
state.
— The transmitter has no switch-off elements. Therefore,
overcurrent protective devices, lightning protection, or
voltage disconnection options must be provided at the
plant.
— The power supply and signal are routed in the same line
and must be implemented as a SELV or PELV circuit in
accordance with the relevant standard (standard
version). For the Ex version, the guidelines stipulated by
the Ex standard must to be adhered to.
— You must check that the available supply power
corresponds to the information on the name plate.
NOTICE
The signal cable wires must be provided with wire end
sleeves.
The slotted screws of the connection terminals are
tightened with a size 1 screwdriver (3.5 or 4 mm).
6.3.1 Protection of the transmitter from damage
caused by highly energetic electrical
interferences
The transmitter has no switch-off elements. Therefore,
overcurrent protective devices, lightning protection, or
voltage disconnection options must be provided at the
plant.
For the shielding and grounding of the device and the
connection cable, observe the chapter titled 'Examples of
shielding / grounding' on page 18 .
NOTICE
Damage to the temperature transmitter!
Overvoltage, overcurrent and high-frequency interference
signals on the supply connection as well as sensor
connection side of the device can damage the temperature
transmitter.
A
Fig. 15
A Do not weld B No high-frequency interference signals /
Switching operations of bulk consumers C No overvoltages
caused by lightning strikes
Overcurrent and overvoltage can occur through for example
welding operations, switching operations of large electric
consumers, or lightning in the vicinity of the transmitter,
sensor, as well as connector cables.
Temperature transmitters are sensitive devices on the
sensor side as well. Long connector cables to the sensor can
encourage damaging interference. This can already happen
if temperature sensors are connected to the transmitter
during installation, but are not yet integrated into the
system (no connection to the supply isolator / DCS)!
B C
M11115