Program features 89
Safety and protections
Fixed/Standard protections
Overcurrent
If the output current exceeds the internal overcurrent limit, the IGBTs are shut down
immediately to protect the drive.
DC overvoltage
See section Overvoltage control on page 85.
DC undervoltage
See section Undervoltage control (power loss ride-through) on page 85.
Drive temperature
If the temperature rises high enough, the drive first starts to limit the switching
frequency and then the current to protect itself. If it is still keeps heating up, for
example because of a fan failure, an overtemperature fault is generated.
Short circuit
In case of a short circuit, the IGBTs are shut down immediately to protect the drive.
Earth (Ground) fault detection
Note that
• an earth fault in the supply cable does not activate the protection
• in a grounded supply, the protection activates within 2 milliseconds
• in an ungrounded supply, the supply capacitance must be 1 microfarad or more
• the capacitive currents caused by shielded motor cables up to 300 meters will not
activate the protection
the protection is deactivated when the drive is stopped.
Emergency stop
The emergency stop signal is connected to the input selected by parameter 21.05
Emergency stop source. An emergency stop can also be generated through fieldbus
(parameter 06.01 Main control word, bits 0…2).
ACS180 FW.book Page 89 Tuesday, March 9, 2021 2:25 PM
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