Technical data 413
ACH550-01 User's Manual
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 (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.
The most common temperature sensors are:
• motor sizes IEC180…225: thermal switch (e.g. Klixon)
• motor sizes IEC200…250: and larger: PTC or PT100.
R5 frame size,
8 kHz fsw,
Category C3,
150 m cable
Check operational limits for R5 and 8 kHz ->
for a 150 m cable the basic unit is sufficient.
Check EMC limits -> EMC requirements for
Category C3 cannot be met with a 300 m
cable. The installation configuration is not
possible. An EMC plan is recommended to
overcome the situation.
R6 frame size,
4 kHz fsw,
EMC limits not
applicable,
150 m cable
Check operational limits for R6 and 4 kHz ->
for a 150 m cable the basic unit is sufficient.
EMC limits do not need to be checked as
there are no EMC requirements.
00577999.xls A
Requirements Checking and conclusions
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