Chapter 5 MAINTENANCE AND INSPECTION
Perform daily and periodic inspections to avoid trouble and keep reliable operation of the dynamic breaking unit for a long
time. When performing inspections, follow the instructions given in this chapter.
• Before proceeding to the maintenance/inspection jobs,
turn OFF the power OFF, wait at least ten minutes,
and
make sure that the charging lamp are turned OFF. Further, make sure, using a multimeter or a similar instrument, that
the DC link bus voltage between the terminals P(+) and N(-) has dropped to the safe level (+25 VDC or below).
Electric shock may occur.
• Maintenance, inspection, and parts replacement should be made only by authorized persons.
• Take off the watch, rings and other metallic objects before starting work.
• Use insulated tools.
• Never modify the dynamic breaking unit.
Electric shock or injuries could occur.
5.1 Inspection Interval
Table 7.1-1 lists the inspection intervals and check items, as a guide.
Table 7.1-1 List of Inspections
Inspection type
Inspection interval
Check items
Daily inspection
Every day
See Section 5.2.
Periodic inspection
Every year
See Section 5.3.
Decennial inspection
*
1
Every
10
years Replacement of cooling fans
*
2
Replacement of DC link bus capacitors and close checks
Replacement of fuses
*1 The decennial inspection (except replacement of cooling fans) should be performed only by the persons who have
finished the Fuji Electric training course. Contact the sales agent where you purchased the product or your nearest Fuji
Electric representative.
*2 For the standard replacement interval of cooling fans, refer to Section 5.4 "List of Periodic Replacement Parts."
The replacement intervals are based on the stack type's service life estimated at an ambient temperature of 30
°
C.
In environments with an ambient temperature above 40
°
C or a large amount of dust or dirt, the replacement
intervals may be shorter.
Standard replacement intervals mentioned above are only a guide for replacement, not a guaranteed service life.
5.2 Daily Inspection
Visually inspect the dynamic breaking unit for operation errors from the outside without removing the covers when the
dynamic breaking unit is running or the power is ON.
Table 5.2-1 lists daily inspection items.
Table 5.2-1 Daily Inspection List
Check part
Check item
How to inspect
Evaluation criteria
Environment
1) Check the ambient temperature,
humidity, vibration and atmosphere
(dust, gas, oil mist, or water drops).
2) Check that tools or other foreign
materials or dangerous objects are not
left around the equipment.
1) Check visually or
measure using
apparatus.
2) Visual inspection
1) The installation
environment given in
Chapter 1, Section 1.3.1
must be satisfied.
2) No foreign or dangerous
objects are left.
External
appearance and
others
1) Check that the bolts securing the wires
to the main circuit terminals and
control circuit terminals are not loose
before turning the power ON.
25
2) Check for traces of overheat,
discoloration and other defects.
3) Check for abnormal noise, odor, or
excessive vibration.
1) Retighten.
2) Visual inspection
1) No looseness. If loose,
retighten the screws.
2), 3)
3) Auditory, visual, and
olfactory inspection
No
abnormalities
Cooling fans
Check for abnormal noise or excessive
vibration when the cooling fans are in
operation.
Auditory and visual
inspections
No abnormalities
Summary of Contents for BUC S-69D
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