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Voice board installation, Grounding and power surge protection, Power supply fuse – Sensaphone SCADA 3000 Users manual User Manual

Page 42: Estimating power consumption, Voice board installation -6

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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