LEGRAND Raritan PX3TS, User Manual

Page: 184 / 911

Chapter 6: Using the PX3TS
164
Fuses for the Inlet Transfer Switch
PX3TS models always contain two fuses for protecting the inlet transfer switch.
These fuses blow when the current flowing through them exceeds the fuse
rating.
If any fuse blows or malfunctions, the front panel indicates this situation by
turning on the 'Fuse' indicator lamp. See
Alarm Indicator Lamps (on page 118).
At the same time, the internal beeper turns on. See Beeper (on page 168).
To determine which fuse is affected, check the front panel display of the
transfer switch.
Comparison: Fuses for the inlet transfer switch protect the inlet transfer switch
from overload. Overcurrent protectors for outlets, if available, protect
associated outlets from overload. The rating of a fuse for the inlet transfer
switch is higher than the rating of an overcurrent protector for outlets. See
Overcurrent Protectors for Outlets (on page 167).
Replacing a Fuse on 1U Models
This section introduces how to replace a fuse on a 1U model.
To order replacement fuses from Raritan, see Technical Specifications (on page
721) for correct fuse types.
Replacing a "blown" fuse can be performed while both inlets remain connected
to power.
To replace a fuse:
1. Identify the bad fuse by checking the fuse status using the LCD display or
web interface.
2. Examine your PX3TS and the connected equipment to remove or resolve
the cause that results in the overload or short circuit.
This step is required,
or you cannot proceed with the next step.
3. When you are sure the overload does NOT exist, you can force transfer to
the inlet with the good fuse to restore the current output to outlets. See
Manual Transfer When an Alarm is Present (on page 114).
▪
In case the good fuse blows after manual transfer, stop and repeat
Step 2.
4. This step is recommended but not required -- disconnect the inlet with the
bad fuse from power.
5. Uninstall the bad fuse's holder from the PX3TS.