BGLEN01A EB3S January 2024
4. Output specifications
(1) When wiring to the non-intrinsically safe circuit side, connect to
terminals A and C. The output circuit is not equipped with short-
circuit protection. If required, provide a protection in the external
circuit.
(2) Some types of loads generate reverse emf or cause a large inrush
current, resulting in a shorter operation life of output relay contacts.
The operation life of contacts can be extended by preventing the
reverse emf using a diode, RC, or varistor, or by suppressing the
inrush current using a resistor or RL. Contacts are made of gold-clad
silver. When using at a small current and a low voltage(reference
value: 0.1 mA, 0.1V), test the contact on the actual circuit before
use.
(3) Transistor output
When connecting a small load, the load may not turn off because of
a leakage current, even though the transistor output is turned off. If
this is the case, connect a resistor in parallel with the load to bypass
the leakage current.
When an excessively high voltage or a reverse voltage is applied to
the output terminals, the clamping circuit or output transistor may be
damaged.
When driving an inductive load, be sure to connect a diode across
the load to absorb reverse emf.
Example of an overvoltage absorption circuit
Load
(An)
(Cn)
: Surge absorber
5. Wiring for intrinsic safety
(1) The voltage applied on the general circuit connected to the non-
intrinsically safe circuit terminals of the product must be 250V
AC, 50/60Hz, or 250V DC at the maximum under any conditions,
including the voltage of the input power and the internal circuit.
(2) When wiring, take into consideration the prevention of
electromagnetic and electrostatic charges on intrinsically safe
circuits. Also, prevent intrinsically safe circuits from contacting with
other circuits. The intrinsically safe circuits must be separated from
non-intrinsically safe circuits.
(3) Enclose intrinsically safe circuits in a metallic tube or duct, or
separate the intrinsically safe circuits referring to the table below.
Reference: Cables with a magnetic shield, such as a metallic sheath, prevent
electromagnetic induction and electrostatic induction, however, a
non-magnetic shield cannot prevent electromagnetic induction.
Finely twisted pair cables prevent electromagnetic induction.
Twisted pair cables with shields prevent electrostatic induction.
(4) When identifying intrinsically safe circuits by color, use light blue
terminal blocks and cables.
Minimum parallel distance between the intrinsically safe circuit
and other circuits (mm)
Voltage and current of
other circuits
Over 100A
100A
maximum
50A
maximum
10A
maximum
Over 440V
2000
2000
2000
2000
440V maximum
2000
600
600
600
220V maximum
2000
600
600
500
110V maximum
2000
600
500
300
60V maximum
2000
500
300
150
(5) Make sure that the power of the relay barrier and contact part are
turned off before inspection or replacement.
(6) Connect one set of sensors per barrier channel.
(7) When wiring the intrinsically safe circuit, determine the distance to
satisfy the wiring parameters shown below.
(a) Wiring inductance: Lc≤0.453mH-Li
(b) Wiring capacitance: Cc≤5.8μF-Ci
(c) Allowable wiring distance is the smallest value of those
calculated from the capacitance, inductance, and resistance
below.
Lc/L
Cc/C
(6.4V-Vmin.)/(16mA×2R)
L [mH/km]:Inductance of cable per km
C [nF/km]:Capacitance of cable per km
R [Ω/km]: Resistance of cable per km
Example: Vmin.=6.0V, Li=10μH, Ci=4.5μF, R=40Ω/km,
When L=1mH/km and C=0.2μF/km,
the possible sensor wiring distances from equations
,
,
and
Lc/L=443m
Cc/C=6.5km
(6.4V-6.0V)/(16mA×2×40)=312m
Therefore, the wiring distance is less than 312m.
(8) Compatible wire size
0.5 to 2.1mm
2
(AWG20 to 14)
Instructions
Be sure to read the instruction manual carefully before performing installation, wiring, or maintenance work.
For details on mounting, wiring, and maintenance, see the instruction manual from the below URL.
URL : https://product.idec.com/?product=EB3S-N
5
EB3S Sensor Barrier (Intrinsically
Safe
Explosion-Proof)
