27
Trouble State
Cause
Measures
Short circuit on
load side
Insulation deterioration
Wiring failure
Handling mistake
No-fuse
breaker or
fuse blew Simultaneously closing when using
reversing or
-
starter.
Check the cause and make modifications.
If there is a fault with the unit, replace the
unit.
Chattering occurs.
Check the cause and make modifications.
The switching frequency is too high.
Lower the frequency or increase the
capacity.
A semi-attraction state is caused by a
drop in voltage.
Check and remove the cause of the
voltage drop.
Electrical life
If there is no fault in the unit, replace the
entire unit.
Contact
welding
Light
welding
occurred
during use
The load is too large.
Replace with a magnetic contactor and
motor having the correct capacity.
The load is too large.
Replace with a magnetic contactor having
a large capacity.
The switching frequency is high.
Select a capacity that matches the
frequency.
Arc during
switching
is large.
The bounce at closing is large.
Check the cause and make modifications.
The contact chattering is large.
Check the cause and make modifications.
The
contact’s
brazed
section
has fallen
off.
The switching frequency is too high.
Lower the frequency, or replace with a
part having a large capacity.
There is corrosive gas.
Modify the case or installation position.
Abnormal
wear of
contact
The wear
is fast.
Simultaneous contact does not take
place.
Set to approx. 0.5mm or less.
Low voltage, low current
Set to 100V 50mA or more if possible.
Connect the contacts in parallel
(redundancy).
Contact failure
The mechanism section is damaged. Replace the entire unit.
The terminals were not tightened.
The terminal screws were not
tightened sufficiently.
Replace the entire unit.
Correctly tighten the screws.
The screws were loosened by
vibration or impact.
Prevent vibration and impact.
The wires are thin.
Replace the wires and entire unit.
Terminal
burning
Burning of
terminals
or wires
Contact welding or wear (life).
Replace the entire unit.
The core is worn. (The life is up.)
Replace the entire unit.
The power supply voltage is low.
Check the cause and make modifications.
A beating
sound is
heard.
The sound
is heard
occasio-
nally
There are high levels of corrosive gas
or humidity.
Use a DC operated or mechanical latch
that prevents entry from external sources.
Summary of Contents for MS-T Series
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