It is not possible to check the fuse visually.
Fuse may be checked by means of
ohmmeter. Infinite resistance in the fuse
circuit means that the fuse is burnt and
must be replaced.
For the unit use sub-miniature slow blow
fuse 1.25A compliant to IEC 60127 and with
maximum switching current not lower than 100A.
Example of such fuse is slow blow fuse 1.25A
type MXT-250 (from Schurter). To replace the
fuse, disconnect the controller from power
supply, open its casing and replace the burnt
fuse with a new one (Fig. 14.1)
Fig. 14.1 Fuse replacement
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