ABB ACS 601 Hardware Manual page 11

Motor Type
ABB Motors
(manufactured
from beginning of
1998)
Random-wound
Motors
Form-wound
Motors
ACS/ACC/ACP 601 Drives
voltage of the pulses is approximately 1.35 times the input line voltage
with a very short rise time.
The voltage of the pulses can be almost double at the motor terminals,
depending on the properties of the cable between the drive and the
motor. This in turn can cause additional stress to the motor insulation.
The motor manufacturer should be consulted regarding the
characteristics of the motor insulation system. Failure of the motor to
fulfill the following requirements may shorten its life.
The following table lists the insulation requirements for motors used
with ACx 600 AC drives.
Nominal
AC Line Voltage
< 500 V
V Standard insulation system
N
525 V < V ≤ 690 V
Standard insulation and dv/dt filter
N
or
special insulation system
≤ 420 V
V Motor insulation system must withstand V
N
420 V < V ≤ 500 V
If motor insulation system withstands V
N
µs rise time, a dv/dt filter is not needed.
With a dv/dt filter at the output of the ACx 600, motor
insulation system must withstand V
500 V < V ≤ 600 V
Motor insulation system must withstand V
N
dv/dt filter must be used at the output of the ACx 600.
600 V < V ≤ 690 V
Motor insulation system must withstand
N
V
PK
ACx 600.
≤ 690 V
V If motor insulation system withstands V
N
time 0.3 µs, no dv/dt filter is needed.
Symbol
V
N
V
PK
:
Rise time
= 0.8 · /(dv/dt)
t V
PK
Motor Insulation Requirement
= 1800 V. A dv/dt filter must be used at the output of the
Definition
nominal power line voltage
peak line to line voltage at motor terminals
Rise time is line to line voltage change rate
at motor terminals (the interval during
which the voltage changes from 10 % to
90 % of the whole voltage range)
V and
PK
the values of V
diagrams below.
ACx=ACS/ACC/ACP
Safety Instructions
= 1300 V.
PK
= 1600 V and 0.2
PK
= 1300 V.
PK
= 1600 V. A
PK
= 2000 V and rise
PK
t depend on cable length. Read
and dv/dt from the
PK
vii