parallax power supply 7345ru parts PWM
My 7345 is not charging the coach batteries but does supply 12power to all accessories. The transformer, fan and relays work fine. Think i need a PWM circuit for it. Contacted PP tec support and th...
Forum Discussion
1. Find R32.
2. Lift the lead of R32 that's closer to the transformer out of the circuit board.
3. Solder a small signal diode (anode side) into the circuit board hole where the lead of R32 was removed.
4. Solder the cathode side of diode (it has the black band) to the lifted side of R32. Both the diode and R32 are angled up into the air.
5. Solder a 100 ohm, 1/8W resistor to the junction of diode and R32.
6. Solder bell wire (or whatever wire you have) from the other side of the 100 ohm resistor to the battery. This wire conducts very little current.
When the battery is thirsty, the diode clamps max voltage to about 0.5V above regulation, or to about 14.3V at the output of the converter. The battery voltage will charge to regulation (13.7V).
Sal
2. Lift the lead of R32 that's closer to the transformer out of the circuit board.
3. Solder a small signal diode (anode side) into the circuit board hole where the lead of R32 was removed.
4. Solder the cathode side of diode (it has the black band) to the lifted side of R32. Both the diode and R32 are angled up into the air.
5. Solder a 100 ohm, 1/8W resistor to the junction of diode and R32.
6. Solder bell wire (or whatever wire you have) from the other side of the 100 ohm resistor to the battery. This wire conducts very little current.
When the battery is thirsty, the diode clamps max voltage to about 0.5V above regulation, or to about 14.3V at the output of the converter. The battery voltage will charge to regulation (13.7V).
Sal
