5. Specifications
5.1. Interface Specifications
DC, Power port
Rated voltage
a
Viper-x12A LV units: 24 to 38 VDC
Viper-x12A HV units: 48 to 110 VDC
Operating voltage
b
Viper-12A LV units:
16.8 to 49.9 VDC (14.4 to 53.2 VDC for 100 ms)
Viper-12A HV units:
33.6 to 143 VDC (28.8 to 154 VDC for 100 ms)
Rated current
Viper-x12A LV units: max 4.6 A at 24 VDC, max 2.9 A at 38 VDC
Viper-x12A HV units: max 2.4 A at 48 VDC, max 1.0 A at 110 VDC
Rated frequency
DC
Inrush current, I²t
Viper-x12A LV units: 540 mA
2
s at 24 VDC, 410 mA
2
s at 38 V
Viper-x12A HV units: 190 ma
2
s at 48 VDC, 160 mA
2
s at 110 V
Startup current
c
Viper-x12A LV units: 1.5 A at 16.8 VDC
Viper-x12A HV units: 750 mA at 33.6 VDC
Polarity
Reverse polarity protected
Redundant power input
No
Isolation
2250 VDC to all other ports
Circuit type
Secondary circuit hazardous voltage, OVC II
Connector
Viper-x12A LV units:
4-pin, male, M12, T-coded, recommended Westermo cable:
3146-1109 for 5 m
Viper-x12A HV units:
4-pin, male, M12, A-coded, recommended Westermo cables:
3146-1106 for 1.5 m
3146-1107 for 5 m
Cable size
For Viper-x12A HV units:
M12, recommended power cable area 0.5 mm² (minimum 0.25 mm²),
which correlates to AWG 21 or larger
For Viper-x12A LV units:
M12, recommended power cable area 1 mm² (minimum 0.75 mm²),
which correlates to AWG 18 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
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 12A-PoE Series
