ABB High dynamic performance HDP Serie Manuel D'installation, D'utilisation Et De Maintenance page 24

ENGLISH
1.6.4 Bearing currents
In HDP motors, insulated bearings are provided by default according to the rules explained in the table below.
In addition, common mode filters and suitable cabling and grounding methods must be used according to the
following instructions and using the following table:
Table 6 Bearing rules
U ≤ 500 V
N
500V > U ≤ 600V
N
500V > U ≤ 600V
N
(cable length > 150 m)
600V > U ≤ 690V
N
600V > U ≤ 690V
N
(cable length > 150 m)
* for motors only available for U
1.6.4.1 Elimination of bearing currents with ABB converters
In the case of an ABB frequency converter, e.g., AC_8_ _- and AC_5_ _-series with a diode supply unit, the methods
according to Table 6 Bearing rules must be used to avoid harmful bearing currents in motors.
NOTE:
1.6.4.2 Elimination of bearing currents with all other converters
The user is responsible for protecting the motor and driven equipment from harmful bearing currents. Instructions
described in Chapter 1.6.4.1 Elimination of bearing currents with ABB converters can be used as guidelines, but their
effectiveness cannot be guaranteed in all cases.
P <100 kW
N
Standard motor
Standard motor
+dU/dt –filter (reactor)
Standard motor
Reinforced insulation*
+dU/dt –filter (reactor)
Reinforced insulation*
> 500V, reinforced insulation included as standard.
N
In case of replacement, insulated bearings which have aluminumoxide coated
inner and/or outer bores or ceramic rolling elements are recommended. Aluminum
oxide coatings shall also be treated with a sealant to prevent dirt and humidity
penetrating into the porous coating. For the exact type of bearing insulation, see
the motor's rating plate.
Changing the bearing type or insulation method without ABB's permission is
prohibited
P ≥100 kW
N
Standard motor (has
insulated N-bearing)
Standard motor (has
insulated N-bearing)
+dU/dt –filter (reactor)
Standard motor (has
insulated N-bearing)
Reinforced insulation*
(has insulated N-bearing)
+dU/dt –filter (reactor)
Reinforced insulation*
(has insulated N-bearing)
24
P ≥ 350 kW
N
Standard motor (has
insulated N-bearing)
+Common mode filter
Standard motor (has
insulated N-bearing)
+dU/dt –filter (reactor)
+Common mode filter
OR
Reinforced insulation*
(has insulated N-bearing)
+Common mode filter
Standard motor (has
insulated N-bearing)
+Common mode filter
Reinforced insulation*
(has insulated N-bearing)
+dU/dt –filter (reactor)
+Common mode filter
Reinforced insulation*
(has insulated N-bearing)
+Common mode filter