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ELECTRICAL
Source(s): Southwire Surge Guard Installation and Operating
Instructions Model 40450RVC/ Southwire Surge Guard Model 40450
RVC Troubleshooting Guide
Product(s): Southwire Surge Guard 50 Amp Automatic Transfer Switch
(Model: 40450RVC, Newmar Part Number: 152216)
Southwire 50 Amp Automatic Transfer Switch (Model:
40450RVC)
This article provides basic operation instructions for
a Southwire Surge Guard 50 Amp Automatic Transfer
Switch (Model: 40450RVC).
The 40450 series automatic transfer switch (ATS) has
many different protective features to protect your coach
from low quality power. Included in these are protection
against high voltage, low voltage, and an incorrectly
connected chassis ground. If one of these fault conditions
is encountered, the ATS will open both contactors in order
to protect the coach. Once the fault condition goes away,
the ATS will delay for approximately 2.5 minutes before
trying to close the appropriate contactor again.
Test Procedure
1. Plug RV’s shore power cord into utility power source.
2. Wait for the time delay, then observe remote display
of shore power status.***
3. Turn on RV’s generator (generator power source is
dominant over shore power). A 30 second delay will
occur.
4. Observe remote display for generator output status
(Volts/Amps).
5. Switch off generator, observe remote display of
transfer “Delay Active-Shore Power.”
6. Shore power activated, observe remote display
(Voltage/Amps). ***Acceptable shore and/or generator
power range is 100-135 Votls. Load (Amperes) 0-50
Amps.
Note: During generator (only) power-up, the monitor
display will be blank for approximately 30 seconds for
generator warm-up.
If there is no error message and the display instead reads
“Delay Active” this means that the fault condition has
cleared and that the switch is going through a 2.5 minute
delay before it will attempt to close the contactor again.
Wait until this delay is over to see if the ATS correctly
closes its contactor.
If no display is available, check the level of the input
voltage to ensure it is within the proper operating limits.
Also check that the ATS is correctly connected to chassis
ground and that the neutral conductor is correctly
connected to ground at the power pedestal. Wait 2.5
minutes to check if the fault condition was temporary and
has cleared. If so, the contactor will pull in at the end of
the 2.5 minute period.
A remote power monitor may be installed in select
coaches and allows for continuous visual indication of
source voltage and load current or diagnostics.
If the ATS fails to close the contactor or transfer when
expected, check the 40450 display to see if an error
message is displayed. The screen will flash an error
message for that failure such as “Loss of Ground”, “High
Volt”, or “Reverse Polarity”. The error condition must
be corrected in order for the transfer switch to function
correctly. Refer to the table on the following page for help
in troubleshooting these conditions.
There will be a slight delay between the start of the
generator and the electrical connection. This delay
allows the generator to reach normal operating speed
without needing to supply a required load. When the
unit is plugged into shore power, an audible click will be
heard in the transfer switch box. The sound is normal
and indicates that the relay inside the transfer switch is
engaging the outside power source.
Product(s): This information is associated with more than one product.
Refer to Newgle for more information about the product(s) offered for
your coach’s model year.
After market surge protection placed at the shore power
supply source is an optional product, which provides an
increased layer of surge protection. However, it is not
required or installed by Newmar.
NOTE FROM NEWMAR