Emerson ROC827 instruction manual Power Consumption of the MVS Modules

ROC827 Instruction Manual

Table 3-12. Power Consumption of the MVS Modules

Power Consumption (mW)		Quantity	Duty	Sub-Total
I/O Module		Used	Cycle	(mW)
Description	PTYPICAL

MVS Module

Per Active LED – Maximum 2

Power provided by the module for the MVS sensors

112 mA @ 12 volts dc	1344 mW
1.5 mA	18 mW

1.25 * Measured

Current Draw at +1

Terminal

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

Issued Mar-06 Power Connections 3-18