MITSUBISHI ELECTRIC J2-JRSERIES MR-J2-03A5 - Manual (Page 124)

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8. INSPECTION
8. INSPECTION
WARNING
y Before starting maintenance/inspection, switch power off, and after more than 10
seconds have elapsed, confirm that the voltage is safe in the tester or the like.
Otherwise, you may get an electric shock.
y Any person who is involved in inspection should be fully competent to do the work.
Otherwise, you may get an electric shock. For repair and parts replacement,
contact your safes representative.
POINT
y Do not test the servo amplifier with a megger (measure insulation
resistance), or it may become faulty.
y Do not disassemble and/or repair the equipment on customer side.
(1) Inspection
Check the cables and the like for scratches and cracks. Perform periodic inspection according to
operating conditions.
(2) Life
The following parts must be changed periodically as listed below. If any part is found faulty, it must be
changed immediately even when it has not yet reached the end of its life, which depends on the
operating method and environmental conditions.
Part Name Life Guideline
Smoothing
capacitor
10 years
Relay 100,000 times
(a) Smoothing capacitor : Affected by ripple currents, etc. and deteriorates in characteristic. The
life of the capacitor greatly depends on ambient temperature and
operating conditions. The capacitor will reach the end of its life in 10
years of continuous operation in normal air-conditioned environment.
(b) Relays : Their contacts will wear due to switching currents and contact faults
occur. Relays reach the end of their life at cumulative 100,000
switching times (switching life), which depends on the power supply
capacity.