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S.NO.
NOTICED
PROBLEM
Heavy
sound
observed All the
3
time
Continuously for
more.
(More than 30
sec)
Erratic behavior
of SCVS
1)Heavy
fluctuation at
output voltage
even though
4
input is stable
2) Continuous
sound different
to no. 3
5
Frequent Tripping
of
Input
MCB/MCCB
Output
MCB/MCCB
c) Faulty Electronic card
PROBABLE CAUSE
a) Due to faulty servomotor a) Replace the servomotor.
b) Due to mechanical
misalignment stucked Auto
or
transformer (variac)
c) Faulty R-C network
d) Faulty control card
e) Faulty micro switches
a) Loose carbon brush
b) Heavy carbon deposition
on
transformer(variac)
c) Loose connection at Auto
transformer at any point
a) Over loaded output one
phase got struck.
b) Loose connection at Auto
transformer
c) Loose connection at
contactor
d) Due to very low input
or
voltage
e) Very high input Voltage
c) Replace the faulty card.
REMEDY
b) Check the pinion gear and coupling
gear, if faulty replace and realign.
c) Replace the R-C network
d) Replace the control card
e) Replace them with new one
a ) Tighten the carbon brush
b) Clean the commutator surface Of
Auto
auto transformer (variac) with clean
cotton dipped in petrol and allow it to
dry for few seconds.
c) Check each and every wire
connection tighten it if found loose
CAUTION: a) The system is overloaded
beyond its capacity, reduce the load.
b) Check all the connections thoroughly
and tighten it if found loose.
c) Tighten the connections at the
contactor
CAUTION:
d) Derate the load if the system is
operating very much below the rated
input voltage
CAUTION:
e) Stop the system if input is more
than 10% of the rated input
voltage.
operation of SCVS beyond the
rated input voltage ceases the
warranty.
The
continuous
39
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