Program features 129
Local control vs. external control
The drive has two main control locations: external and local. You can use the control
locations to control the drive, read status data, and adjust parameters.
The control location is selected with the LOC/REM key on the control panel or with
the PC tool (Take/Release button).
Local control
When the drive is in local control, the control commands are given from the control
panel keypad or from a PC equipped with the DriveStudio PC tool.
Local control is mainly used during commissioning and maintenance. The control
panel always overrides the external control signal sources when used in local control.
Changing the control location to local can be disabled with parameter 16.01 LOCAL
LOCK.
External control
When the drive is in external control, control commands (start/stop and reference) are
given through the I/O terminals (digital inputs), optional I/O extension modules (digital
inputs), or the fieldbus interface (through an optional fieldbus adapter module). For
information on the use of the fieldbus interface, contact your local ABB
representative.
External control is used for control signals (eg, start up/down and stop). The speed
reference is selected based on the combined status of the four configurable bit
pointer parameters 80.06 SPEED REF SEL1, 80.07 SPEED REF SEL2, 80.08
SPEED REF SEL3 and 80.09 SPEED REF SEL4.
Safe torque off
The ACL30 has an integrated Safe torque off (STO) function. The function disables
the control voltage of the power semiconductors of the drive output stage, thus
preventing the inverter from generating the voltage required to rotate the motor. By
using the Safe torque off function, both contactors interrupting the current to the
motor in the elevator machine may be left out.
For more information, see Safe torque off function for ACL30 drive application guide
(3AXD50000045959 [English]).
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