6–13

SJ300 Inverter

Capacitor Replacement

The capacitor bank consists of an assembly that slides out of the SJ300 unit. This means that no soldering is required!

1.First, make sure that all power is removed from the unit, and that you have waited 5 minutes before accessing the wiring area. Then you’ll need to remove the metal wire entry plate located at the bottom of the unit. This may require you to disconnect all wires to the power terminals. Then, just loosen the screws as shown, and slide the wire entry plate outward on its guides to remove.

Retention screws for wire entry plate

WARNING: The screws that retain the capacitor bank assembly are part of the electrical circuit of the high-voltage internal DC bus. Be sure that all power has been disconnected from the inverter, and that you have waited at least 5 minutes before accessing the terminals or screws. Be sure the charge lamp is extinguished. Otherwise, there is the danger of electrocution to personnel.

2.The capacitor bank assembly is locked into the inverter via two screws that also make the electrical connection to the internal DC bus. These two screws are accessible just below the power terminals as shown to the right.

Retention screws for capacitor bank

3.Grasp the capacitor bank assembly and gently slide it out of the unit as shown to the right. DO NOT try to force the removal; it will slide out easily if all the screws in the steps above have been removed.

4.Then slide in the new unit and replace all the screws removed in steps 1) and 2).

CAUTION: Do not operate the inverter unless you have replaced the two screws that connect the capacitor bank assembly to the internal DC bus. Otherwise, damage to the inverter may occur.

Pull capacitor bank assembly outward

from SJ300 unit to remove

Troubleshooting Maintenance and