7.7. Motor protection
Many monitoring functions integrated in the inverter can detect errors and thus protect
the device or motor from being destroyed or overloaded.
•
Motor overload monitoring (i²*t)
156
•
Current limits
160
•
Overcurrent monitoring
162
•
Motor phase failure detection
163
•
Motor speed monitoring
164
•
Motor torque monitoring
164
7.7.1. Motor overload monitoring (i²*t)
This function monitors the thermal utilisation of the motor, taking the motor currents
recorded and a mathematical model as a basis.
DANGER!
Fire hazard by overheating of the motor.
Possible consequences: Death or severe injuries
▶ To achieve full motor protection, an additional temperature monitoring function with a separate evaluation must be
installed.
Details
This function only serves to functionally protect the motor. It is not suitable for the safety-
relevant protection against energy-induced hazards, since the implementation is not fail-
safe.
• When the thermal motor utilisation calculated reaches the threshold set in 0x2D4B:001
(P308.01), the response set in 0x2D4B:003 (P308.03) is triggered.
• With the setting 0x2D4B:003 (P308.03) = "No response [0]", the monitoring function is
deactivated.
For a UL-compliant operation, leave 0x2D4B:002
(P308.02) and 0x2D4B:003 (P308.03) to the
default setting!
(speed compensation = "on [0]" and error
response = "Fault [3]")
In order to meet the UL requirements, the calculated motor load is internally
saved when the inverter is switched off and loaded again when the inverter is
switched on.
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