9
8
Output Fuse Replacement
The power supply is protected from damage by reverse polarity connection by output fuses. If
the load is connected to the unit in the wrong polarity, the output fuse(s) will blow to protect
the power supply.
Afterwards, the fuses must be replaced for normal unit operation. See the specifications
section for rating and make fuses. All the output fuses must be replaced as they operate in
parallel to add up to the full output current capability of the power supply.
CAUTION:
BEFORE REPLACING THE FUSES, DISCONNECT OR TURN OFF THE AC
POWER TO THE POWER SUPPLY AND DISCONNECT IT FROM THE LOAD.
When connecting the load to the unit a small arc can form between the connectors. To ensure
spark-free connections, make connections only when the power switch is OFF.
TO REPLACE THE FUSES
1. Loosen and remove the ten (10) screws holding the front panel to the unit chassis.
2. Gently wiggle the front panel to unplug it from the main circuit board. The output fuses
are mounted in fuse holders close to the output cable or connector.
3. Remove and replace them all with the same style and current rating.
4. Gently push the front panel connector back onto the main circuit board, ensuring that any
O-Ring or gasket remains properly seated. This is particularly important for W and Y models to
ensure a water-tight seal!
5. Carefully re-insert all the front panel screws loosely, making sure non are cross threaded.
Once all screws are started, tighten them in sequence. These screws are made from corrosion
resistant stainless steel and are softer that regular steel screws, so take care to not over-
tighten.
6. Reconnect AC power to the unit and ensure that it turns ON. Carefully recheck the
polarity of the output connections and then reconnect the load to the power supply. Normal
operation should resume immediately.
Pictured:
Front panel circuit board. Output fuse location indicated by red circle.
