Category Precautions Failure mode and corrective action
Mounting Notes on storing
capacitors
On-board self-
supporting (snap-in)
capacitors
Screw terminal type
capacitors
During use Test run
Preventive
maintenance
Disposal
Other
ALUMINUM ELECTROLYTIC CAPACITORS
11 Hitachi AIC Inc.
1. The capacitors must be stored at normal
temperature with normal humidity and kept out
of of direct sunlight. The maximum storage
period is three years.
2. There may be cases where an electric charge is
generated due to transient phenomena. To
avoid electrical shock hazard, do not touch the
terminals with bare hands.
1.Properly insert the capacitors into the wiring
board.
Solder them while they are in close contact with
the wiring board.
2.Ensure that the flux is not applied to portions
other than the terminal section.
3. Soldering must be conducted within 10 seconds
at 260°C or within 3 seconds at 350°C.
4.For washing off the flux, the use of water-
soluble or high-grade alcoholic cleaning agent
or isopropyl alcohol is recommended. It is also
recommended that the flux concentration be 2
wt% relative to the cleaning agent.
5.After the use of cleaning solution, it must be
allowed to dry. Even when the flux is not to be
removed, allow it to dry.
6.When securing a capacitor to a circuit board
with a coating or a fixing material, be sure that
the employed coating or fixing material does not
contain halogen compounds. Before coating
the capacitor, allow the flux or cleaning agent to
dry completely.
7.When securing a capacitor to a circuit board
with a coating or a fixing material, use care so
that the sealed end of the capacitor is not
entirely covered. Ensure, also, that no coating
or fixing material is applied to the safety vent
section at the bottom of capacitor. When
conducting overall coating, consult your local
Hitachi AIC agent.
1.The terminal section tightening torque should
be 2.2 N-m (3.0 N-m max.) When using the
capacitors in significantly vibrating equipment,
consult your local Hitachi AIC agent.
1.Before allowing the capacitors to conduct,
mount them on a chassis.
1.Capacitors used in industrial equipment must be
inspected on a periodic basis. The inspection
items are as follows:
(1) Appearance (e.g., safety vent condition)
(2) Electrical performance (e.g., capacitance,
power loss, current leakage)
2. If the capacitors have reached the end of their
useful life, they must be replaced.
1. When disposing of the capacitors, hole or crush
their cases and then incinerate them.
2. When the capacitors are not to be incinerated,
they must be buried by an expert industrial
waste disposal agent.
1.After the capacitors have been stored for a period of
more than 3 years, subject them to voltage treatment.
2.Before touching the terminals, discharge them with a
resistor (10 to 100Ω) or discharge plate.
1. If the capacitors are soldered while they are lifted above
the wiring board, terminal breakage or conductive
pattern separation can be caused by mechanical
vibration or shock.
2.If the flux comes into contact with the sealing rubber
surface, corrosion can be caused by the halogen
compound in the flux.
3. If soldering is conducted without satisfying the
prescribed soldering conditions, the capacitors will be
thermally stressed so that electrical characteristic
deterioration or other problem can occur.
4. If the flux concentration in the cleaning solution rises,
the halogen concentration also increases. Therefore,
corrosion can occur as indicated in paragraph 2 above.
5.If any cleaning solution or flux remains between the
circuit board and capacitor, the halogen compound can
permeate into the sealing rubber, resulting in corrosion.
6.If the employed coating or fixing material contains a
halogen compound, corrosion can take place.
7.If the overall coating method is employed, the flux or
cleaning solution halogen compound residue is
confined so that corrosion can occur.
If a coating or a fixing material is applied to the safety
vent section, the safety vent operations will be
obstructed.
1. If the copper bar or the like exceeds 2.0 mm in length,
the screw length should be increased accordingly.
1. If any abnormally high voltage is applied to the
capacitors, they can explode.
1.Before performing periodic maintenance tasks, turn
OFF the switch and allow the capacitors to completely
discharge.
2.If any capacitor in equipment needs to be replaced,
replace all the capacitors used in the same equipment.
If new and old ones are used together, an unbalanced
ripple current or voltage sharing can result.
1. If an attempt is made to incinerate the capacitors
without holing or crushing their cases, they will explode,
resulting in a safety hazard. Be sure that incineration is
conducted at high temperature. If it is done at low
temperature, chlorine or other poisonous gas may be
generated from the external sleeves (made of polyvinyl
chloride).
2.When the capacitors are disposed of by an industrial
waste disposal agent, verify that they are properly
buried. Ensure that no discarded capacitors will be put
back on the market.
1. For further details, refer to EIAJ RCR-2367, Precautions and Guidelines for Using Electronic Device Fixed
Aluminum Nonsolid Electrolytic Capacitors.
2. If you have any questions, feel free to contact your local Hitachi AIC gent.