Program features 91
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 84.
DC undervoltage
See section Undervoltage control (power loss ride-through) on page 84.
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.
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).
The mode of the emergency stop is selected by parameter 21.04 Emergency stop
mode. The following modes are available:
• Off1: Stop along the standard deceleration ramp defined for the particular
reference type in use
• Off2: Stop by coasting
• Off3: Stop by the emergency stop ramp defined by parameter 23.23 Emergency
stop time.
• Stop torque.
With Off1 or Off3 emergency stop modes, the ramp-down of the motor speed can be
supervised by parameters 31.32 Emergency ramp supervision and 31.33 Emergency
ramp supervision delay.
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