ABB ACS250 Istruzione tecnica
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Technical instruction
ACS250 micro drives, 110-480 V
Selecting the start/restart mode
Overview
The ACS250 can be configured to interpret the drive enable
signal in different ways when the drive first powers up. The
ACS250 can be configured to automatically run following
power up if the enable signal to the drive is already present.
Alternatively the drive can be programmed to wait for a
transition state from off to on following power up to ensure
the drive does not automatically run.
The ACS250, when operating in keypad mode, can also
be configured to enable and run at different initial speeds,
depending on the preferences of the application. The drive
can also be configured for keypad speed control (speed set
point) with enable/disable controlled by the enable input.
Additionally the parameter to configure the start/restart mode
is also used to activate the auto trip reset function to define
what actions to take in the event of a trip condition occurring
on the drive.
All of the parameters and settings associated with these
functions are discussed within this technical instruction.
Note that parameters 2108 and 1103
are located in the long paremeter group
("Par L").
Parameters
2108 Start mode select/automatic restart
2108="Edge-r" (Edge run)
Drive in terminal mode
1103=0
The enable signal input (digital input 1) is configured to be
edge-triggered and requires the run signal to be reapplied
after a trip or a power up to start the drive. If the run input
is closed prior to the mains power being applied to the
ACS250, and remains closed while the drive is powered up,
the ACS250 will not start.
"Edge-r" may be used where, for safety reasons, the drive
should not start automatically on power up should the run
switch already be in a closed state. In this case, the run
switch must be opened and then reclosed before the drive
will start. The same rule applies after clearing/resetting a trip
condition.
Drive in keypad mode
1103=1 or 2
The enable signal input must always be present in order for
the drive to run. The drive will power up in a stop condition
and the start button on the keypad will control drive start.
Removal of the enable input will cause the drive to stop.
While the enable is present normal start/stop behavior is
controlled by the start and stop keys on the keypad.