3. Explosion Protection Instrumentation in Zone 2/Division 2
3-7
TI 33Q01J30-01E
WARNING
For the warning of N-IO field enclosure, refer to Appendix 1.4 CSA NI/FM NI/IECEx Ex “ec”
Control Drawing of N-IO field enclosure.
Parameters in Connecting with CSA NI Devices
Energy transfer influences CSA NI properties. In order to maintain these properties, parameters
must be displayed when CSA NI devices are connected.
To display parameters, CSA NI devices are divided into the device that gives energy and the
device that receives energy. The parameters displayed in each device are as follows.
Power
Supply
+
-
Lc (*2)
Cc (*1)
Li
Ci
A
B
Device that gives energy
(The source device)
Device that receives energy
(The load device)
F030102E.ai
Displayed parameters
Voc: maximum open-circuit output voltage
Isc: maximum short-circuit output current
Ca: maximum allowable capacitance
La:
maximum allowable inductance
Cn: maximum allowable capacitance (in a normal circuit voltage of Vn)
Vn:
normal circuit voltage
Ln:
maximum allowable inductance (in a normal circuit current of In)
In:
normal circuit current
*1:
Cc: capacitance of the external wiring
*2:
Lc: inductance of the external wiring
Displayed parameters
Vmax: maximum input voltage
Imax: maximum input current
Ci:
maximum internal capacitance
Li:
maximum internal inductance
Figure Connection of CSA NI Devices and Associated Parameters
Dec .3, 2021-00
