Cable Entries; Grounding; Electrical Connection - ABB 266CRH Instructions Manual

32 266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
... 6 Installation
... Electrical connections

Cable entries

The electrical connection is made via cable entries with a
½ in NPT or M20 ×1.5 thread.
Note
If cable glands are not used, the red transport screw plugs must
be replaced with suitable screw plugs when the transmitter is
installed. This is because the transport screw plugs are not
certified as protected against explosion. This requirement is
particularly relevant in hazardous areas.
Cable entries with an M20 × 1.5 thread
Devices with an M20 × 1.5 thread are optional supplied with
factory-installed cable glands and sealing plugs.
Cable entries with a ½ in NPT thread
The supplied transport sealing plugs do not have IP rating 4X /
IP 67 and are not approved for use in potentially explosive
atmospheres.
The transport sealing plugs must be replaced with suitable cable
glands or sealing plugs during device installation.
When selecting the cable glands or sealing plugs, make sure they
have the required IP rating and explosion protection!
To offer IP rating 4X / IP 67, the cable glands / sealing plugs
must be screwed in using a suitable sealing compound.
Cable entrie for PT100 temperature sensor
A metal cable gland should always be used for the Pt100 cable
since a shielded cable is used.
Connect the shielding within the metal cable gland!
To offer IP rating 4X / IP 67, the cable glands / sealing plugs
must be screwed in using a suitable sealing compound.
Safety instructions for use in Division 1
Conduit requirements for Div. 1 installations are not addressed
in this procedure.
To avoid creating a hazardous situation, ensure compliance with
the applicable standards, regulations, and recommendations for
installation in the country of use. Resistance thermometer
installation in classified Div. 1 areas should only be performed by
technicians knowledgeable about explosion protection.
Explosionproof and flameproof installations require explosion-
proof conduit and poured seals or flameproof rated cable and
cable glands, respectively.

Grounding

1
1 Ground terminal
Figure 24: Ground terminal on transmitter housing
The pressure transmitter housing should be grounded in
accordance with national and local electrical codes.
The ground connection is mandatory for surge protector
equipped devices in order to ensure proper functioning.
Protective grounding terminals (PE) are available outside and/or
inside the housing of the transmitter.
Both ground terminals are electrically connected and it up to the
user to decide which one to use.
The most effective transmitter case grounding method is direct
connection to earth ground with impedance equal or less of 5 .

Electrical connection

A(+)
B(-)
Figure 25: Terminals
Terminal Function / comment
PWR + / PWR Power supply
A (+) / B ( ) Modbus interface RS485
1 / 2 / 3 / 4 Terminals for connecting the Pt100 resistance thermometer
M10837-01
COMM.
SURGE
RTD
INSIDE
M11188