11
<Control Drawing of USB I/F on PS-A's Front Module>
The information below concerns the use of the USB I/F located on the PS-A unit's front modules used in Class I, Division
2 Groups A, B, C, and D hazardous locations (from Doc No. 35016429).
Notes:
1. Nonincendive Circuit Parameters:
Front USB Port:
Voc = 5.0 V
Isc = 1.25 A
Ca = 10 µF
La = 16 µH
2. Selected Associated Nonincendive Field Wiring Apparatus shall satisfy the following:
3. If the electrical parameters of the cable are unknown, the following values may be used:
Capacitance = 60 pF/ft
Inductive = 0.20 µH/ft
4. Nonincendive Field Wiring must be installed in accordance with article 501.10(B) of the National Electrical Code
ANSI/NFPA 70.
5. Nonincendive Field Wiring Apparatus shall not contain or be connected to another source of power.
Nonincendive Field
Wiring Apparatus
-
Front module of
PS-A unit
Voc
≤
Vmax
Isc
≤
lmax
Ca
≥
Ci + C cable
La
≥
Li + L cable
PS-A’s Front module
USB Pin Description
1. Vcc
2. D-
3. D+
4. GND
(See Note 1 for details)
Shield GND
Nonincendive Field
Wiring Apparatus
1 2 3 4
Associated Nonincendive Field Wiring
Apparatus
