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Troubleshooting 5-9MN894
Reset an Overload Relay If the Overload relay is tripped, the tripped indicator (Reset Button of Figure 5-6) will be in
the “Tripped” position.
1. Verify that the overload condition has been cleared to allow restart.
2. Verify motor lead connections are tight.
3. Allow time for the overload to cool.
4. Press the “Reset Button” (Figure 5-6).
Figure 5-6 Overload Relay
Reset
Button
Reset
Button
Fuse Replacement If the control circuit voltage drops to zero volts, the control power transformer fuses
(Figure 5-7) should be inspected. If a fuse is opened, perform the following steps:
1. Check for line-to-ground short circuit condition and repair if necessary.
2. Check control wiring and control devices (timers, relays, terminal blocks, wire
terminations, etc.) for signs of damage, overheating, or loose connections and
repair if necessary.
3. Replace the fuse with the same fuse class, type, rating and interrupting
capacity.
Figure 5-7 Control Transformer with Fuses