ACQ550-U1 User’s Manual 281
Technical data
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.
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 parameter 3501
SENSOR TYPE), the function either monitors a calculated temperature value (based on
a motor thermal model, see parameters 3005
MOT THERM PROT … 3009 BREAK POINT
FREQ) or an actual temperature indication given by motor temperature sensors (see
Group 35: MOTOR TEMP MEAS). The user can tune the thermal model further by
feeding in additional motor and load data.
R3 frame size,
4kHz fsw,
Category C3,
300 m (980 ft) cable
Check operational limits for R3 and 4 kHz -> a 300 m (980 ft) cable
cannot be used even with a du/dt filter. A sine filter must be used and
the voltage drop of the cable must be taken into account in the
installation.
Check EMC limits -> EMC requirements for Category C3 are met
with a 300 m (980 ft) cable.
R5 frame size,
8kHz fsw,
Category C3,
150 m (490 ft) cable
Check operational limits for R5 and 8 kHz -> for a 150 m (490 ft)
cable the basic unit is sufficient.
Check EMC limits -> EMC requirements for Category C3 cannot be
met with a 300 m (980 ft) cable. The installation configuration is not
possible. An EMC plan is recommended to overcome the situation.
R6 frame size,
4kHz fsw,
EMC limits not
applicable,
150 m (490 ft) cable
Check operational limits for R6 and 4 kHz -> for a 150 m (490 ft)
cable the basic unit is sufficient.
EMC limits do not need to be checked as there are no EMC
requirements.
Maximum cable length for 600 V drives
Frame
size
Operational limits
1/4 kHz 8/12 kHz
m
ft m ft
R2 100 330 100 330
R3…R4 200
660 100 330
R6 300
980 150
2
490
2
2
12 kHz switching frequency is not available.
Requirements Checking and conclusions
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