NAR300 system for high temperature
Electrical connection
Hauser
37
6
Intrinsically safe terminal
7
Power supply arrester (installed)/Thread (M3)
8
Green-yellow: FG safety barrier GND (for Class A grounding/TIIS specification only)/Thread (M4) (see 6
below)
1.
Normally, only the FG of a sensor I/F Ex box is shielded; however, depending on
the installation environment, either the GND of NRR262 alone or both the FG of the
sensor I/F Ex box and the GND of NRR262 are connected.
2.
It is connected when an FG-equipped AC cable is used.
3.
When using a 22 to 26 V
DC
power supply, terminal number L is + (positive) and N
is - (negative).
4.
In order to maintain the Ex [ia] performance, ensure that the power supply voltage
does not exceed 250 V
AC
50/60 Hz and 250 V
DC
during normal time and abnormal
time, respectively.
5.
The cable (1) for connecting NAR300 and sensor I/F Ex box is included with
NAR300. The cable (5) connecting the sensor I/F Ex box to the NRR261, the alarm
output cable (2) from the NRR261, as well as the power cable (3) to the NRR261 are
not included and must be prepared by the customer. For detailed information on the
connection cables, see the "Process conditions" section.
6.
Perform Class A grounding work at a non-hazardous location using one of the FG
safety barrier GNDs on terminal number 8 or i (TIIS specification only).
