ABB ACS880-07 - Requirements for ABB Motors, P; Requirements Tables

Modern variable speed drives with their fast rising voltage pulses and high switching
frequencies can generate current pulses that flow through the motor bearings. This
can gradually erode the bearing races and rolling elements.
d u /d t filters protect motor insulation system and reduce bearing currents. Common
mode filters reduce bearing currents. Insulated N-end (non-drive end) bearings protect
against bearing currents.
￭
Requirements tables
These tables show how to select the motor insulation system and when a drive d u /d t
and common mode filters and insulated N-end (non-drive end) motor bearings are
required. Ignoring the requirements or improper installation may shorten motor life
or damage the motor bearings and voids the warranty.
Requirements for ABB motors, P
n
< 100 kW (134 hp)
See also Abbreviations (page 96).
Requirement forNominal AC line
voltage
Motor type
ABB d u /d t and common mode filters, insulated
N-end motor bearings
Motor insula-
tion system
P
n
< 100 kW and frame size < IEC 315
P
n
< 134 hp and frame size < NEMA 500
-Standard U
n
≤ 500 VRandom-wound
M2_, M3_ and M4_
+ d u /d t Standard500 V < U
n
≤ 600 V
-Reinforced
+ d u /d t Reinforced600 V < U
n
≤ 690 V
(cable length ≤
150 m)
-Reinforced600 V < U
n
≤ 690 V
(cable length >
150 m)
N/AStandard380 V < U
n
≤ 690 VForm-wound HX_
and AM_
+ N + d u /d t with voltages over 500 V + CMFCheck with
the motor
manufac-
turer.
380 V < U
n
≤ 690 V
Old
1)
form-wound
HX_ and modular
+ N + CMFEnamelled
wire with
fiber glass
taping
0 V < U
n
≤ 500 V
Random-wound HX_
and AM_
2)
+ N + d u /d t + CMF500 V < U
n
≤ 690 V
Consult the motor manufacturer.HDP
1)
manufactured before 1.1.1998
2)
For motors manufactured before 1.1.1998, check for additional instructions with the motor manufacturer.
Guidelines for planning the electrical installation 93