ABB ACS850 series, Firmware Manual

Page: 43 / 260

Program features 43
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Motor phase loss detection (parameter 30.04 )
The parameter selects how the drive reacts whenever a motor phase loss is detected.
„
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 and . For more information
on the Safe Torque Off function, see the
Hardware Manual of the drive.
„
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 (torque, frequency and time) and choose how the drive reacts to a motor stall
condition.
Scalar motor control
It is possible to select scalar control as the motor control method instead of Direct
Torque Control (DTC). In scalar control mode, the drive is controlled with a frequency
reference. However, the outstanding performance of DTC is not achieved in scalar
control.
It is recommended to activate the scalar motor control mode in the following
situations:
• In multimotor drives: 1) if the load is not equally shared between the motors, 2) if
the motors are of different sizes, or 3) if the motors are going to be changed after
motor identification (ID run)