80 Program features
Earth fault detection (parameter 30.05)
The earth fault detection function is based on sum current measurement. Note that
• an earth fault in the supply cable does not activate the protection
• in a grounded supply, the protection activates in 200 milliseconds
• in an ungrounded supply, the supply capacitance should be 1 microfarad or more
• the capacitive currents caused by shielded motor cables up to 300 metres will not
activate the protection
• the protection is deactivated when the drive is stopped.
Supply phase loss detection (parameter 30.06)
The parameter selects how the drive reacts whenever a supply phase loss is
detected.
Safe torque off detection (parameter 30.07)
The drive monitors the status of the Safe torque off input. For more information on the
Safe torque off function, see the Hardware Manual of the drive, and Application guide
- Safe torque off function for ACSM1, ACS850 and ACQ810 drives (3AFE68929814
[English]).
Switched supply and motor cabling (parameter 30.08)
The drive can detect if the supply and motor cables have accidentally been switched
(for example, if the supply is connected to the motor connection of the drive). The
parameter selects if a fault is generated or not.
Stall protection (parameters 30.09…30.12)
The drive protects the motor in a stall situation. It is possible to adjust the supervision
limits (current, frequency and time) and choose how the drive reacts to a motor stall
condition.
Automatic fault reset
The drive can automatically reset itself after overcurrent, overvoltage, undervoltage,
external and “analog input below minimum” faults. By default, automatic resets are off
and must be separately activated by the user.
Settings
Parameter group 32 Automatic reset (page 202).
Diagnostics
Parameter 08.07 Alarm word3 (page 132).
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