Dynamics is discontinuing support for our older products listed below.
We are providing customers with owners manuals and troubleshooting
information for the discontinued models. Unfortunately we will no
longer be able to provide support for these models. We do have some
parts available for sale
(click for service parts)
Converters... How They Operate
Power Converters consist of the following components
Transformer – Reduces the 120 VAC from the
Shore Power Cord down to approximately 13.8 Volts AC (Alternating
Current) at its secondary output.
Diode Rectifier – Converts the 13.8 Volts AC
from the Transformer secondary output to approximately 13.8
Volts DC (Direct Current)
Relay – Automatically disconnects the RV Battery
from the 12-volt RV circuits and then connects the 13.8-volt
power to the RV 12-volt circuits when Shore Power is connected
to the RV.
Battery Charger Circuit Board – Senses the
battery voltage and then provides a signal to the SCR (Silicon
Controlled Rectifier) to turn it ”ON”, which
in turn supplies charging current to the RV Battery. The charger
board is equipped with an LED (Light Emitting Diode) that
indicates the charging status as follows. (LED optional on
Light “ON” all of the time – The battery
is being charged.
Flashing Light – The battery is approximately 90% charged.
Very Slow Flashing Light – When the light blinks approximately
every 5-10 seconds, the battery is fully charged.
5. SCR (Silicon Controlled Rectifier) –
This is basically an electronic switch that is controlled
by the circuit board. It is turned “ON” when the
battery needs charging current and is turned “OFF”,
when the circuit board senses the battery is charged.
Current Limiting Resistor – This resistor limits
the amount of charging current that can be delivered to the
In Figure 1 shown above no AC power is connected to the RV.
The RV battery is supplying 12-volt power (Red Arrows ) to the
RV branch circuits through the N.C. (Normally Closed) contacts
of the relay. See figure 2 below for operation when AC power
is applied. The Isolated Circuits for the Radio, TV or Stereo
are connected directly to the battery positive terminal.
When AC power is
applied, the Transformer reduces the 120 VAC down to 13.8
VAC (Alternating Current). It is then fed through the Diode
Rectifiers, which convert this AC Voltage to 13.8 VDC. This
DC power is also fed to the Relay Coil, which in turn pulls
down the center arm of the Relay so that it makes contact
with the lower N.O. (Normally Open) contacts. Now the converter
feeds DC Power to the branch circuits (red arrows). This action
also disconnects the RV battery from the branch circuits and
places it on charge (blue arrows). Note that the DC power
for the Isolated Circuits is always coming directly from the
battery or the charging circuit when 120 VAC power is applied
to the RV (green arrows).
All models operate in this same manner.
Transfer Relays... How
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