Replacement Of Parts - Mitsubishi FR-BU2-1.5K Instruction Manual

7.5 Replacement of Parts

The brake unit consists of many electronic parts such as semiconductor
devices. The following parts may deteriorate with age because of their
structures or physical characteristics, leading to reduced performance or
fault of the brake unit. For preventive maintenance, the parts must be
replaced periodically.
Part Name
On-board smoothing
capacitor
Relays
* The design life of electrolytic capacitor is about ten years (36000h) if used for 10 hours a day
and 365 days a year in the average yearly ambient temperature of 40
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
(1) Smoothing capacitors
An aluminum electrolytic capacitor is used for stabilizing the control power in
the control circuit. The characteristics is deteriorated by the adverse effects
of ripple currents, etc. The replacement intervals greatly vary with the
ambient temperature and operating conditions. When the inverter is
operated in air-conditioned, normal environment conditions, replace the
capacitors about every 10 years.
When a certain period of time has elapsed, the capacitors will deteriorate
more rapidly. Check the capacitors at least every year (less than six months
if the life will be expired soon).
The appearance criteria for inspection are as follows:
1) Case:
2) Sealing plate: Check for remarkable warp and extreme crack.
3) Check for external crack, discoloration, liquid leakage, etc. Judge that the
capacitor has reached its life when the measured capacitance of the
capacitor reduced below 85% of the rating.
(2) Relays
To prevent a contact fault, etc., relays must be replaced according to the
cumulative number of switching times (switching life).
Standard Replacement
Interval
10 years*
---
Check the side and bottom faces for expansion.
PRECAUTIONS FOR MAINTENANCE
AND INSPECTION
Description
Replace the board (as required)
as required
°
.
C
47