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ROC800-Series Instruction Manual
3-22
Power Connections
Revised Jul-14
Table 3-14. Power Consumption of the MVS Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
MVS Module
112 mA @ 12 volts dc
1344 mW
Per Active LED – Maximum 2
1.5 mA
18 mW
Power provided by the module
for the MVS sensors
1.25 * Measured
Current Draw at +
Terminal
1
Table Total
Note
:
For an MVS sensor, the typical mW per MVS is about 300 mW.
Duty Cycle
The duty cycle is the time on divided by the total time. For an MVS,
the sensor is always drawing power, so enter the duty cycle as “1” for
the MVS power calculations. The LEDs can also have an associated
duty cycle, which is essentially the percent of time that the LEDs are
active.
Duty Cycle = Active time
÷
(Active time + Inactive time)
For example, if the LEDs are on approximately 20 minutes a day:
Duty Cycle = 20 minutes
÷
(24 * 60 minutes in a day) = 20
÷
1440 = 0.014
Table 3-15. Power Consumption of the MVS I/O Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
MVS Module
27 mA @ 12 volts dc
325 mW
0 ,1, 2
1
Power provided by the module
for the MVS sensors
300 mW
1 – 12
1
Table Total
Note
:
For an MVS sensor, the typical mW per MVS is about 300 mW.