TRC Surge Guard 40350 RVC

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The 40350 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.

If the ATS fails to close the contactor or transfer when expected, check the 40350 display

to see if an error message is displayed. The screen will ash 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.

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.

CAUTION: To avoid damage to the transfer switch or the RV, the torque specications

TROUBLESHOOTING GUIDE

Model 40350 RVC

Automatic Transfer Switch

PROBLEM TROUBLESHOOTING STEPS

Unit does not engage shore

contactor when shore power

is present after 10 seconds.

• If available, check the 40350 display screen to see if an error message is displayed. Refer to Table 2 for

further troubleshooting.

• Check the input power at the RV pedestal. If the power is outside of the range of 102-132V, the unit will

protect the RV by not engaging the contactor. Move to a different source of power that is within the correct

limits.

• Check to make sure that the incoming power is within 55-70 Hz in frequency.

• Check to make sure that the incoming neutral is at the same voltage as the green incoming ground wire.

• Double check all wiring connections into the ATS and make sure that they are all properly torqued down.

Unit does not transfer to

generator power correctly

when the generator is

turned on.

Note that the ATS takes approximately 50 seconds to complete the transfer from shore power to generator power

after the generator is started. If this amount of time has passed and the generator contactor still does not engage,

check the following:

• If available, check the 40350 display screen to see if an error message is displayed. Refer to Table 2 for

further troubleshooting.

• Check the voltage level on the incoming generator lines. If the power is outside of the range of 102-132V,

the unit will protect the RV by not engaging the contactor. Refer to generator documentation to x incoming

voltage within acceptable limits.

• Check the incoming generator circuit breaker to ensure it is not tripped.

• Check to make sure that the incoming power is within 55-70 Hz in frequency.

• Verify that the incoming neutral is at the same voltage as the green incoming ground wire.

• Double check all wiring connections into the ATS and make sure that they are all properly torqued down.

For technical assistance, please call 1-800-780-4324 x 20311

TECHNOLOGY RESEARCH, LLC A Southwire Company

5250 140th Avenue North ▪ Clearwater, Florida 33760

505-00114A

on the terminal block cable installation diagram MUST be followed. Make sure that the screws holding the input and output power cables down to the

terminal block are fully tightened to the correct torque. Failure to fully tighten these connections could cause an electrical shock or re hazard. Care

must be taken to assure that the terminal screws are not cross threaded, otherwise an improper torque will result.

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Summary

Troubleshooting Error Codes

No Ground Error

Check ATS grounding. Ensure green wire is attached to terminal block and grounded to RV.

High;Low Voltage Error

Verify incoming generator voltage is within 102-132V.

High;Low Frequency Error

Check incoming frequency is within 55-70 Hz.

L1;L2 Open Error

Check input power connections for faults and generator breaker status.

Reverse Polarity Error

Ensure L1 and L2 are not mis-wired into the neutral terminal.

Check Surge Error

Indicates a blown fuse for surge protectors on the control board.

Overview

The Surge Guard Model 40350 RVC is an Automatic Transfer Switch (ATS) designed for RV power protection. Its primary function is to safeguard your recreational vehicle from low-quality power sources by automatically switching between available power inputs, such as shore power and generator power. This device incorporates several protective features, including defense against high voltage, low voltage, and incorrectly connected chassis ground.

When any of these fault conditions are detected, the ATS will open both contactors to protect the RV's electrical system. Once the fault condition is resolved, the ATS initiates a delay of approximately 2.5 minutes before attempting to re-engage the appropriate contactor. This delay ensures that the power source has stabilized before reconnecting the RV.

The ATS is equipped with an optional 40299 Remote LCD Display that provides valuable feedback to the user. If the ATS fails to close a contactor or transfer power as expected, the display will show an error message. These messages, such as "Loss of Ground," "High Volt," or "Reverse Polarity," indicate specific fault conditions that must be corrected for the transfer switch to operate correctly. If the display reads "Delay Active" instead of an error message, it signifies that a fault condition has cleared, and the switch is undergoing its 2.5-minute delay before attempting to reconnect.

For troubleshooting, if no display is available, users should check the input voltage level to ensure it falls within the proper operating limits. It's also crucial to verify that the ATS is correctly connected to chassis ground and that the neutral conductor is properly connected to ground at the power pedestal. A 2.5-minute wait is recommended to see if a temporary fault condition has cleared, allowing the contactor to engage.

The device's usage features include its automatic transfer capability, which seamlessly switches power sources without manual intervention. This ensures continuous power supply to the RV while protecting its electrical components from harmful power fluctuations. The ATS constantly monitors incoming frequency, ensuring it remains within the 55-70 Hz range. If the frequency falls outside these limits, the transfer switch will keep the contactor open to protect the RV.

Maintenance features primarily involve troubleshooting and verifying connections. Users are advised to regularly check the 40350 display screen for error messages, which guide them to specific issues. For instance, a "No Ground" error indicates a problem with the ATS grounding or the input power pedestal's ground. A "High/Low Voltage" error suggests that the incoming voltage is outside the acceptable 102-132V range, prompting users to adjust the generator's output or find a different shore power source. Similarly, "High/Low Frequency" errors require checking and adjusting the generator's frequency.

The "L1/L2 Open" error points to a possible faulty connection on the input power to the transfer switch, requiring users to verify all input cables and circuit breakers. The "Reverse Polarity" error signifies incorrect wiring of hot leads into the neutral terminal, necessitating a power-off inspection and correction of connections. Finally, a "Check Surge" message indicates that one of the fuses for the surge protectors on the control board has blown. While this doesn't affect normal transfer switch operation, replacing the fuse is necessary to restore surge protection capability.

Installation and maintenance also emphasize the importance of correct wiring and torque specifications. The terminal block cable installation diagram must be followed precisely, and all screws holding the input and output power cables must be fully tightened to the correct torque. Failure to do so can lead to electrical shock or fire hazards. Care must be taken to avoid cross-threading terminal screws, which could result in improper torque.

In summary, the Surge Guard Model 40350 RVC is a robust and intelligent automatic transfer switch that provides comprehensive power protection for RVs. Its automatic fault detection, error display system, and detailed troubleshooting guidelines make it a user-friendly device for maintaining the integrity of an RV's electrical system. Regular monitoring of the display and adherence to installation and maintenance instructions are key to ensuring its optimal performance and the longevity of your RV's electrical components.