Users manual

4-2
SCADA 3000 User’s Manual
GROUNDING AND POWER SURGE PROTECTION
SCADA 3000 should be earth grounded by connecting a true earth ground to the terminal
labeled EG. This is essential to protect SCADA 3000 from possible damage due to static elec-
tricity, power surges and lightning strikes.
The Sensaphone
®
SCADA 3000 can be damaged by power surges and lightning through the
telephone line and the power supply. Although SCADA 3000 has built-in surge protection,
consideration should be given to provide additional protection for the unit and for any elec-
tronic equipment that is attached to your power supply and telephone lines, especially if you
live in a lightning-prone area. Surge protection is available through Sensaphone. Call for
details.
Power Supply Fuse
The main unit includes a 4A Fuse to protect the unit and power supply from short circuits and/
or product malfunction. If no lights come on when you depress the power switch, it is possible
that the fuse is blown. You can verify a blown fuse by removing it and testing for continuity.
To remove the fuse, simply pull it straight out of its socket. A spare fuse has been included for
convenience, but be sure to correct the problem before trying another fuse (Replacement fuse:
Wickman #3721400041). Any of the following could cause the fuse to blow:
• toomuchcurrentbeingdrawnduetothenumberofmodulesconnected.
• voltageatthepowerinputterminalstoohigh(16VMax.)
• internalcircuitmalfunction
Estimating Power Consumption
Determining the power consumption of the system is required to make sure you have enough
power available from your power supply in addition to determining the proper size battery for
your application.
Listed below is the typical power consumed by the main unit and each module in the SCADA
3000 family when powered from 15 VDC.
Calculating Power Consumption for the SCADA 3000
Quantity x Current (Ea.) = Total (amps)
MainRTUpower _____x 0.215Amps= ___________
Modemoption _____x 0.085Amps= ___________
RealVoiceoption _____x 0.008Amps= ___________
Universalinputmodule _____x 0.100Amps= ___________
PulseCountmodule _____x 0.100Amps= ___________
Thermocouplemodule _____x 0.100Amps= ___________
Relayoutputmodule _____x 0.080Amps= ___________
Analogoutputmodule _____x 0.080Amps= ___________
Annunciatormodule _____x 0.100Amps= ___________
BatteryChargeCurrent _____x 0.600Amps= ___________
*Numberof4-20mAtransducers _____x 0.038Amps= ___________
powered from the 24 V supply
AddWirelessDataRadio  ____Amps(avg.) ___________
Total Current= __________Amps