5.11 ROTATING DIODE BRIDGE TEST
Carry out the test using a D.C. source as indicated below.
A diode in good condition should allow the current to flow
only
in the anode-to-cathode direction.
Disconnect the diodes before the test.
3 ... 48 volts
+
-
1
2
1 - Anode
2 - Cathode
Diode type
Positive
Negative
SKR
diode housing
diode wire
SKN
diode wire
diode housing
When reassembling ensure that the diodes are tightened to
the correct torque
5.12 CLEANING THE WINDINGS
5.12.0 General points
The cleaning of the winding is a heavy service operation
which has to be engaged only if necessary.
The cleaning of the windings become necessary as soon
as the insulation resistance and/or the polarization index
are not satisfactory (refer to chapter 5.10.2)
5.12.1 Coil-cleaning products
A long term efficient cleaning can only be done in a work
Shop if equipped with specialized devices. A site cleaning,
because less efficient, can be considered only for a
transient period.
CAUTION :
USED CLEANING AGENT MUST BE IN ACCORDANCE
WITH LOCAL REGULATION AND ENVIRONMENTAL
STANDARD
CAUTION:
SOLVENTS, WHICH are highly chlorinated and subject
to hydrolysis in damp atmospheres are prohibited.
They quickly become acidified, producing corrosive
and conductive hydrochloric acid.
CAUTION:
DO NOT USE TRICHLORETHYLENE,
PERCHLORETHYLENE, OR TRICHLORETHANE
Avoid mixtures sold under various trademarks which often
contain white spirit (which evaporates too slowly) or
chlorinated products (which are likely to become acidified).
CAUTION:
DO NOT USE TOO STRONG ALKALINE PRODUCTS.
THEY ARE DIFFICULT TO RINSE AND CAUSE
REDUCTION OF INSULATION RESISTANCE BY FIXING
THE HUMIDITY
5.12.2 Cleaning operation
Use a soft alkaline product or a dedicated cleaning agent
We recommend the use of the cleaning agent "ASOREL
CN" from "Rhône Chimie Industrie" ; 07300 Tournon ;
France. This cleaning agent do not make the rinsing
operation imperative.
It is essential to avoid entry of cleaning agents and dirt into
the slots. Apply the product with a brush, sponging
frequently in order to avoid accumulation in the housing.
After cleaning, a rinsing operation is imperative. Hot soft
water (less than 80°C) used under pressure (less than 20
bars) can be used.
CAUTION:
AFTER CLEANING THE GENERATOR, DRYING IS
IMPERATIVE TO RECOVER THE CORRECT WINDING
INSULATION
Electric Power Generation
Installation and maintenance
5654
en - 2017.
10
/
a
LSA 5
2
.2
MHV
Industrial Range Alternators
- 4 pole
31
