ROC364 Instruction Manual
1-9
General Information
Rev Jun/05
1.5.3 Totaling Power Requirements
To adequately meet the needs of the ROC system, it is important to determine the total power
consumption to size the solar panel and battery backup requirements accordingly. For total power
consumption, add the device values in Table 1-1.
Although Table 1-1 and Table 1-2 take into account the power supplied by the ROC to its connected
devices, be sure to add the power consumption (in mW) of any other devices used with the ROC in the
same power system, but not accounted for in the tables.
Convert the total value (in mW) to Watts by dividing it by 1000.
mW
÷
1000 = Watts
For selecting an adequate power supply, use a safety factor (SF) of 1.25 to account for losses and other
variables not factored into the power consumption calculations. To incorporate the safety factor,
multiply the total power consumption (P) by 1.25.
P
SF
= P
x
1.25 = _____ Watts
To convert P
SF
to current consumption in amps (I
SF
), divide P
SF
by the system voltage (V), either 12
volts or 24 volts.
I
SF
= P
SF
/ V = _____ Amps
1.6 Startup and Operation
Before starting up the ROC, perform the following checks to ensure the unit is properly installed.
♦
Make sure the enclosure has a good earth ground.
♦
Make sure the MCU is grounded at the power input connector.
♦
Make sure all I/O module racks are grounded at the GND screw.
♦
Make sure the MCU and I/O module racks are secured to the factory backplate.
♦
Ensure FlashPAC modules are seated in their connectors.
♦
Seat and secure all I/O modules in their sockets.
♦
Check the field wiring for proper installation.
♦
Make sure the input power has the correct polarity.
♦
Make sure the input power is fused at the power source.
Check the input power polarity before turning on the power switch. Incorrect polarity can
damage the ROC.
When installing units in a hazardous area, ensure that the components selected are labeled for use
in such areas. Change components only in an area known to be non-hazardous. Performing these
procedures in a hazardous area could result in personal injury or property damage.