Diagnostics and Repair - Power

When the ROV powers up, you will hear a series of tones, the lights will flash, and you should be able to see some internal LEDs light up. If none of these occur a power problem is possible. Power problems can occur on the AC side or DC side. If some, but not all of the start-up indicators work, a power problem is less likely, and a communications or other ROV internal problem is possible.

AC Power Problems

If the control panel will not turn on, the first place to check is the power cord and power source. Press the GFCI test button. The GFCI will not trip without power being applied to it. If the system does not trip, either there is no power (more likely) or the GFCI has malfunctioned (less likely). If you confirm there is power and the power cord is plugged in, but the GFCI will not trip, a faulty GFCI is possible.

If the system passes the GFCI test, then the 2 IEC outlets on the rear of the panel should have power when the GFCI is turned on - the computer should show it is operating on AC power and not its battery. If the GFCI is on, and there is no power at the IEC outlets, a faulty GFCI switch or wire fault in the panel is possible.

DC Power Problems

When you turn on the power switch, you should hear the fans turn on, and the green power LED should light. You should also be able to measure 75 Volts DC in the tether connector between pins 3 and 5. If any of these do not work, it could be a faulty power switch, power supply failure or wiring problem (loose or disconnected connector).

If you measure 75 Volts DC in the tether connector, but the ROV still does not have power, it could be a fault in the tether or ROV. Connect the ROV directly to the panel without the tether. If the ROV works, it could be a problem in the tether or its connectors. If the ROV does not work, it could be a problem in its tether connector, or it could be a board failure in the ROV.

The Pro 4 includes a DC LIM (Line Insulation Monitor) protection circuit that is similar to a GFCI. If the LIM is tripped, a yellow LED alarm light on the control panel will illuminate. The LIM can be tested and reset using the buttons on the control panel. If the LIM alarm does not clear after pressing the reset button for at least 30 seconds, eliminate the tether and try again. If the LIM alarm still does not clear, the ROV or control panel must be serviced. See the LIM section of the Operator's manual for more information.

Test Points

Test	Procedure / Location	Expected Result
Measure tether Ohms for continuity	Tether pin 3 male to pin 3 female	Continuity
Measure tether Ohms for continuity	Tether pin 5 male pin 5 female	Continuity
Test tether for a short	Tether pin 3 male/female to any other pin	No short
Test tether for a short	Tether pin 5 male/female to any other pin	No short
Measure control panel voltage	With the control panel on, measure 74 V DC on control panel tether pin 3 female (+) to tether pin 5 (- ground)	74 V DC +/-
Measure ROV accessory port voltage	With the ROV connected and the system on, measure 24 V DC on ROV accessory port pin 3 female (+) to accessory port pin 5 female (- ground)	24 V DC +/-
Measure ROV accessory port voltage	With the ROV connected and the system on, measure 12 V DC on ROV accessory port pin 9 female (+) to accessory port pin 5 female (- ground)	12 V DC +/-

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