5. Specifications
5.1. Interface Specifications
DC, Power port
Rated voltage
a
24 to 110 VDC
Operating voltage
b
16.8 to 143 VDC (14.4 to 154 VDC for 100 ms)
Rated current
Max 470 mA at 24 VDC, max 120 mA at 110 VDC (Viper-208-T4G-
TBN)
Max 660 mA at 24 VDC, max 150 mA at 110 VDC (Viper-208-T8G-
TBN)
Rated frequency
DC
Inrush current, I²t
80 mA²s at 24 VDC, 140 mA²s at 110 VDC
Startup current
c
Max 680 mA at 16.8 VDC (Viper-208-T4G-TBN)
Max 780 mA at 16.8 VDC (Viper-208-T8G-TBN)
Polarity
Reverse polarity protected
Redundant power input
Yes
Isolation
To all other ports
Connector
4-pin, male, M12 screw connection, A-coded, recommended Westermo
cables:
3146-1106 for 1.5 m
3146-1107 for 5 m
Cable size
M12, recommended power cable area 0.5 mm² (minimum 0.25 mm²),
which correlates to AWG 21 or larger
Cable dimensions depend on choice of M12 connector
Cable temperature rating
For minimum temperature rating of the cable to be connected to the field
wiring terminals: -40 to +70 °C
Circuit type
Secondary circuit hazardous voltage, OVC II
a
Also referred to as nominal voltage in EN/IEC 61010-1
b
Also referred to as nominal input including fluctuations in EN/IEC 61010-1
c
Recommended external supply current capability for proper startup
20
Viper-208-TBN Series
