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West Mountain Radio Operating Manual

consumption specifications. In the event that the total current goes over the

40 amp maximum, a fuse will blow or make an undersized power supply

unhappy. The RIGrunner and any equipment plugged into the RIGrunner

should go unharmed.

Using the proper fuses

The RIGrunner comes supplied with a range of fuses installed. This assortment

should be suitable for most stations, but can be changed easily. Every RIGrunner

output is safe up to 40 amps, but the total allowable is also 40 amps.

A fuse MUST be in each position in use. ANY ATTEMPT TO BYPASS

OR SHORT ACROSS THE FUSES IS DANGEROUS AND VOIDS THE

RIGRUNNER WARRANTY. Since the maximum available automotive fuse

is 40 amps, the RIGrunner will be protected as long as any value ATC/ATO

fuse is installed. Choose the correct fuse for your equipment. Standard ATC/

ATO automotive blade fuses are used. These fuses are available in 10 values

ranging from 1 amp to 40 amps.

The DC input should have a fuse that is appropriate for the power supply rating.

If using a smaller power supply, consider using a lower value fuse than the 40

amp value supplied. Ideally all of the outlets should have a fuse that is the next

higher value above the maximum current draw of the unit on that fuse. If using a

power cord with a fuse, match that value or go one or two values higher. Sizing

each fuse for each unit is desirable, but not absolutely necessary. Having a

higher value than the minimum will offer less protection for that unit, too low a

value and the fuse will blow out prematurely.

Note that each fuse position has a LED blown fuse indicator that will conveniently

light up if an output fuse is blown. There must be power to the RIGrunner and

a load on the circuit that has the blown fuse for the blown fuse LED to light.

The voltage comparator and audible alert

A feature of the RIGrunner 4012 and 4008 is the precision expanded scale

voltage comparator display with audible alert. (The 4005 and 4004U models

do not have this feature.) A basic explanation of 12 volt systems will aid in

understanding this feature. Equipment commonly referred to as 12 volt is actually

a nominal 13.8 volts. For example, a lead acid battery is a nominal 12.6 volts

when charged and not under load, and approximately 14.0 volts under charge.

A quality 12 volt power supply will have its regulated output set to 13.8 volts.

Most radios are specified to require 13.8 volts +/- 15%. 12 volt automobile or

aircraft alternators have voltage regulation set between 13.5 and 14.3 volts.

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West Mountain Radio Battery Box Spezifikationen Seite 5