Fuses - Lenze 4800 Manual

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13.1
13-2
48XX/49XXSHB0399

Fuses

Note!
The fuses protect the controller from impermissible operating conditions. After a
protection function has been activated, the controller or system must be checked
for faults before replacing the fuse.
Because of possible damage to the semiconductor fuses, which have not blown,
replace the complete set (phase and armature fuses).
Ensure to use the same fuse type of the same manufacturer as used before.
To protect the semiconductors (thyristors) from short-circuit, use very
quick-acting fuses. The characteristics of fuse and semiconductor must be
adapted to each other.
( The tables TAB 1and TAB 3 list the max. permissible fuse sizes, which
protect the semiconductors in the event of short-circuit, for all controller
sizes.
The protection characteristics of the fuses are guaranteed even if the
controller is operated with max. armature current (1.2 to 1.8 times rated
current of the controller).
The fuses are recommended for standard controllers as well as for variants
with "500V mains voltage".
( For applications which do not require the max. permissible armature
current, check whether it is possible to use smaller rated fuse currents.
The tables TAB 2 and TAB 4 list the assignment of the fuses to the
controller sizes (mains voltage 340 ... 460 V 0%) on condition that the
max. armature current (C022, C023) does not exceed the rated armature
current of the controller.
With fuses other than recommended, check the switch-off characteristic and
whether the actual load cycle does not lead to early ageing of the fuse.
For further information, please contact Lenze or the fuse supplier.