Troubleshooting PSC55-12

[Cliff]

My PSC55-12 isn't charging. I have plenty of shore power to the unit and both 30 amp external fuses are good. I don't see any reset button on the unit. I do see one small gauge blue wire leading to a post just above the fuses, and wonder if that might from a controller: Might I remove that wire and if the unit kicks on I'll know it is a problem with the controller, and if it still doesn't work, it would mean the problem is with the charger? Thanks. Cliff

[Coulomb]

Yes, there is one wire between the SCM and PSC. You have a fairly old unit with the terminal block.

Removing that wire will turn the PSC into a standlone dumb charger, if it works.

[Cliff]

Thanks, I'll try it this weekend. CLiff

[rmorgan700]

I have a similar problem with my scm 12. The control voltage on pin 9 is steady at 8.11 and your guide indicates that it should be between -5 and +5 volts. Is there any help for this problem, as my charger will not function unless I disconnect the control voltage wire.

[Coulomb]

What is the battery voltage when the control voltage is at 8V. At that time, what is the voltage on the charger output?

It may be repairable.

Send products for repair to:

Ample Power Company, LLC.
6315 Seaview Avenue, NW
Seattle, WA 98107

[rmorgan700]

When pin 9 voltage is connected it reads 8.32 with the battery voltage at 12.66

When pin 9 voltage is disconnected the battery voltage is 13.49 output from the charger.

The voltage drop across the pin 9 connection on the converter to ground (pin 4) when the line is disconnected is 2.31.

The charging current appears to be less than 5 amps.

Edit: I believe this unit is over ten years old. If you could send me a detailed schematic it probably could be repaired locally.

[rmorgan700]

Have not received a reply regarding the availability of a schematic for the Smart Charger. Please help!

[Coulomb]

Schematics are not released to the public.

[rmorgan700]

Based on previous input are you able to provide a repair estimate for my board with the sense voltage error?

[Coulomb]

$125 to $175