Parallax Power Supply 7400 Series User manual

7400 Series
Owner’s Manual
Congratulations on the purchase of your new RV. We hope
you have many years of enjoyment. Your new RV is equipped
with the latest, most advanced 120-volt to 12-volt power
converter available today. The Parallax 7400 series electronic
switch mode power converters have been designed to give you
many years of trouble-free use.
These revolutionary RV power converters utilize technology
developed for power supplies in computers that eliminates the
loud, bulky, inefficient power converters of yesteryear.
If you have any comments, please contact Parallax’s Customer
Service Representative at the address, fax or phone number
below.
Parallax Power Supply, L.L.C.
425 Sycamore St.
Anderson, IN 46016
[phone] FAX: [phone]
General Information
A regulated 12-volt power supply, the 7400 series, is
maintenance free. It is so self-sufficient and quiet that you
should not even know it is working except for the occasional
cycling of the cooling fan when necessary. If any 12-volt
appliance fails to operate, first locate your RV’s 12-volt
distribution fuse block and inspect all fuses. If a fuse is open or
“blown” replace it with the same size fuse (never install a larger
fuse). If the fuse opens again, have an electrician or certified
RV technician locate the circuit trouble.
If the 7400 series power converter is not working, first
confirm the RV supply or “shoreline” cord is plugged into a live
circuit. Then check all the 120-volt breakers in your RV
distribution panel to make sure they are “on”. If a breaker is
tripped, follow the instructions to reset the breaker. If the
breaker trips again, consult an electrician or certified RV
technician.
Operation
The 7400 series power converter has been tested for the
utmost safety, it is output short-circuit proof, and UL listed. The
7400 series is also FCC Class B certified so that it will not
interfere with any other electrical equipment as some power
converters do. Some interference could occur from
accumulations of multiple sources.
Converter Operation and
Timer Option
The Parallax 7400 Series (non Option T) has been factory
set at a nominal 13.8 volts output for battery charging.
On non-maintenance free batteries check water level often. Do
not allow the battery cell plates to become exposed to the air.
Poor battery performance will result. Parallax recommends
disconnecting batteries during extended periods of inactive
use or storage following the battery manufacturer’s
recommendations for proper maintenance.
Timer models: (Option T on nameplate label)
The timer circuit is designed to initially establish float voltage
at 14.1 volts for faster battery charging and after the converter
has been connected to shoreline power for 13 hours then
lower float voltage to approximately 13.5 volts.
This abrupt drop in voltage is designed to minimize over
charging during extended periods of operation on shoreline
power. When the AC power is disconnected the timer will
reset. The next time AC power is applied the battery voltage
will again shift up to the 14.1 volt setting for another 13 hrs. ,
only to again drop to the nominal 13.5 volt point. This method
minimizes overcharging on good batteries.
The 7400 series electronic power converter is also designed to
supply the nominal 12-volt filtered D.C. power for all 12 volt
operated devices encountered in RV service. Although the
converter is an excellent battery charger, the converter does
not require a battery to be connected to it for proper operation.
CAUTION: When installing a battery(s) always observe
polarity. Connecting a battery with reverse polarity will open
the two 30-ampere power converter output fuses.
If the 12-volt load exceeds the converter output rating the
output voltage will drop to prevent any further increase in
current. Turn off some lights or appliances and the output
voltage will automatically restore. The same will occur if the
converter exceeds safe operating temperature limits. Check to
see that the converters air circulation is not blocked, or turn off
some of the 12-volt load.
Battery Charger Performance
The National Electric Code requires that power converters for
RV service use is marked with an average charge rate, as part
of the total continuous output rating. Average charge rate will
depend on several variables such as, condition of the
battery(s), temperature, and the length of time the battery(s)
are connected to the converter. In actual RV use the engine
alternator and on board motor generators are also possible
sources of charging currents.
With all these variables it is difficult to determine the average
charge rate from the converter. In most cases the average rate
will be very small; in the order of a few hundred milliamps (1
AMPERE= 1,000 MILLIAMPS). Your Parallax 7400 Series
power converter is capable of delivering its full rated output to
the battery(s) if needed, but will taper off to a few hundred
milliamps when the battery(s) are at full charge
Converter Cooling System
The 7400 electronic fan cooling system is the key to long
life and trouble free operation. The fan is never on more than
required to cool the electronic components in the converter.
You may never hear the fan operate.
Mounting Location
The 7400 series converter is designed for indoor use only!
Qualified service personnel should install the 7400 series
meeting all applicable codes and standards.
Do not mount in engine compartment or other harsh
environments; avoid areas where high levels of dust, dirt, or
moisture may occur.
The Parallax 7400 series power converter is of solid state
design and does not contain relays or mechanical devices that
produce arcs or sparks, but in the unlikely event that an
electronic component would fail, Parallax does not recommend
mounting the power converter in battery compartments or in
areas where flammable materials are stored.
Wire Routing
In order to minimize radio and T.V. interference, avoid
routing supply and output wiring across fan intake or adjacent
to ventilation slots on rear of converter.
Mounting Position
The 7400 fan cooled converters may be mounted in any
position as long as adequate ventilation is allowed for fan
intake and exhaust.
Input Supply Requirements
Connect to a 120VAC 60HZ 3 wire grounded supply with no
larger than 20-ampere circuit protection.
Mounting Clearances
Provide a minimum of three inches to the front and rear of
the converter. Do not mount in zero clearance compartments;
overheating and thermal shut down will result.

Specifications subject to change without prior notice.
Warranty Statement
Parallax warrants is products to be free from
defects in material or workmanship under normal use
and service and limits the remedies to repair or
replacement.
This warranty extends for two years from the date
of purchase and is valid only to the original owner and
within the continental limits of the United Stated and
Canada. You may download the entire Parallax Power
Supply Warranty Policy at:
http://www.parallaxpower.com/warranty_policy
If a problem should occur with your Parallax
converter within the first twenty-four months after
purchase, please contact a dealer that handles
warranty on your brand of RV. No user serviceable
parts inside.
Parallax Power Supply L.L.C.
425 Sycamore St.
Anderson, IN 46016
[phone]
425 Sycamore St.
Anderson, IN 46016
PHONE: [phone]
Fax: [phone]
For a special offer concerning
Extended Warranty Coverage,
Visit our website at
www.parallaxpower.com
7400 Series
Converter/
Battery Charger
Owner’s Manual
51092309-001
Rev. E