PROFACE PS-4700 Series, User Manual

Page: 100 / 164

Industrial Personal Computer Connections
100
The following figure shows the USB cable wiring:
Notes:
1. The following table gives the Non-incendive Circuit Parameters:
The Entity Concept allows interconnection of non-incendive apparatus with
associated apparatus – not specifically examined combinations – as a system when
the approved values of V
oc
(or U
o
) and I
sc
(or I
o
) for the associated apparatus are
less than or equal to Vmax (U
i
) and Imax (I
i
) for the non-incendive apparatus, and
the approved values of C
a
(C
o
) and L
a
(L
o
) for the associated apparatus are greater
than or equal to C
i
+ C
cable
and L
i
+ L
cable
, respectively, for the non-incendive field
wiring apparatus.
2. Associated Non-incendive Field Wiring Apparatus shall satisfy the following:
3. If the electrical parameters of the cable are unknown, the following values may be
used:

C
cable
= 196.85 pF/m (60 pF/ft)

L
cable
= 0.656

H/m (0.20

H/ft)
4. Wiring methods must be in accordance with the electrical code of the country in
use.
The Industrial Personal Computer must be installed in an enclosure. If installed in a
Class I, Division 2 Location, the enclosure must be capable of accepting one or
more Division 2 wiring methods.
Circuit Parameters USB ports 1 and 3 USB ports 2 and 4 USB port 5
Open-circuit voltage = V
oc
5.066 V 5.26 V 5.089 V
Short-circuit current = I
sc
1320 mA 830 mA 1322 mA
Associated
capacitance = C
a
20

F 20

F 20 µF
Associated inductance = L
a
16.8

H 16.8

H 16.8 µH
Industrial Personal Computer - Associated Non-incendive Field Wiring
Apparatus (Mouse, Keyboard)
V
oc
I
sc
C
a
L
a




V
max
I
max
C
i
+ C
cable
L
i
+ L
cable