ABB High dynamic performance HDP Serie Manuel D'installation, D'utilisation Et De Maintenance page 33

ENGLISH
PROBLEM
1.11 Figures
Key X-axis
Y-axis
1)
Figure 6 Diagram illustrating the insulation resistance dependence from the temperature and how to correct the
measured insulation resistance to the temperature of 40°C
CAUSE
Deterioration of grease or lubricant
contaminated
Excess lubricant
Overloaded bearing
Broken ball or rough races
Winding temperature, Celsius Degrees
Insulation Resistance Temperature Coefficient, ktc
To correct observed insulation resistance, Ri, to 40°C multiply it by the
temperature coefficient k*R
ACTION
Remove old grease, wash bearings
thoroughly in kerosene and replace
with new grease.
Reduce the quantity of grease –
bearing should not be more than
half full.
Check alignment, side and end
thrust.
Replace bearings, clean housing
thoroughly first.
= R x
tci 40 °C i
33