Motor Cable Length For 600 V Drives; Motor Thermal Protection; Ground Fault Protection - ABB ACS550 User Manual

ACS550 User's Manual

Motor cable length for 600 V drives

The table below shows the maximum motor cable lengths for 600 V drives with
different switching frequencies. As the 600 V drives are not CE approved, cable
lengths for EMC limits are not given.
Maximum cable length for 600 V drives
Frame
size
R2
R3...R4
R6
2
12 kHz switching frequency is not available.
WARNING! Using a motor cable longer than specified in the table above may cause
permanent damage to the drive.

Motor thermal protection

According to regulations, the motor must be protected against thermal overload and
the current must be switched off when overload is detected. The drive includes a
motor thermal protection function that protects the motor and switches off the current
when necessary. Depending on a drive parameter value (see
TEMP
on a motor thermal model) or an actual temperature indication given by motor
temperature sensors. The user can tune the thermal model further by feeding in
additional motor and load data.
The most common temperature sensors are:
• motor sizes IEC180...225: thermal switch (e.g. Klixon)
• motor sizes IEC200...250 and larger: PTC or PT100.

Ground fault protection

ACS550 internal fault logic detects ground faults in the drive, motor, or motor cable.
This fault logic:
• is NOT a personal safety or fire protection feature
• can be disabled using parameter 3017
• could be tripped by leakage currents (input power to ground) associated with long
high capacitance motor cables.
Operational limits
1/4 kHz
m ft
100 330
200 660
300 980
MEAS), the function either monitors a calculated temperature value (based
8/12 kHz
m ft
100 330
100 330
2 2
150 490
EARTH FAULT
273
Group 35: MOTOR
Technical data