Page 277 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

Sl.No. Complaints Causes and remedies
1 Machine not Swiching “ON” I Check for open connection and rectify the same I Check
the incoming supply
III Check the fuse on the machine
IV Check the motor windings and repair of minor repairs can
be carried out, if needed send it for repairs/rewinding for
internal open circuit.
V Check the speed governing starting switch, repair or
replace with a new switch.
2 Water not filling up in the washing I The inlet pipe is chocked. Open the inlet valve, clean it and
drum reconnect it using water proofing teflon tape
I Check incoming water supply and replace the same.

3 Water does not drain out of the I Check the timer working. The timing mechanism at pre-
wash drum deter- mined times set on the timer have been closed or
clogged - if possible, repair it.Otherwise replace the timer
with a new one.
I The timer may be okay but the switch may be stuck
-replace the switch.

4 Machine does not switch ‘OFF’ after I Check the timer working. The timing mechanism at pre-
deter- mined times set on the timer have been closed or
clogged - if possible, repair it.Otherwise replace the timer
with a new one.
II The timer may be okay but the switch may be stuck -replace
the switch.

5 Machine becomes ‘ON only for I The timer setting may be incorrect;set the timer properly.
a very short duration and then II The speed governor switch may be faulty; dismantle the
switches off motor and repair the same, If possible, or replace the
starting speed governor swivel mechanism.
III The running winding impedance could have increased due
to open circuit and insulation failure. Check the running
winding impedance and rewind the motor, if necessary.
6 The machine is noisy I Check the balancing of the drum and correct the same if
found off balance.
I The motor shaft pulley/drum driver pulley may be
loose,tighten the same.
III The belt of the machine drive might have loosened thus
giving play.
IV Check the bearings of the motor, replace the worn out or
grease the same using the recommended grease.
V Check all rubber bushings that are used in the machine
for absorbing mechanical vibration, and replace, if found
spoilt or missing.
7 The machine gives shock I Isolate the machine from the spply and carry out megger
test I If there is an insulation failure found in the plug, isolate
the
motor and check the winding with body.
III If winding insulation failure is detected, send the motor for
rewinding.
IV If insulation failure is detected, trace the complete wiring
of the machine and locate the faulty or leaky insulation area.
V Replace the complete wire that is found faulty

260

CITS : Power - Electrician & Wireman - Exercise 101