ABB ACS250 Owner's manual

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.

3AUA0000156965 REV A EN 6.5.2015
2108 =“ Auto-0” (Auto-run, default)
Drive in terminal mode
1103=0
The enable signal input (digital input 1) is configured to be
automatically recognised and is not required to be reasserted
following a trip or a power up in order 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 start.
“Auto-0” is normally used where access to the enable input is
restricted and the drive needs to run as soon as mains power
is applied. It must only be used where this form of start up
presents no danger to personnel or equipment in the vicinity
of any moving or electrical parts.
Drive in keypad mode
1103=1 or 2
The enable signal input must always by 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.
2108=“Auto-1”, “Auto-2”, “Auto-3”, ”Auto-4”, “Auto-5”
In this mode, the operation is similar to “Auto-0“, except
that the user can define how many times the drive will
automatically attempt to clear a trip and restart before
permanently tripping and requiring a manual reset. The drive
will make between 1 (“Auto-1“) and 5 (“Auto-5“) automatic
attempts to clear the trip and restart.Note that parameter
1100 (keypad mode restart function) must be set to 2 or 3.
The delay between restart attempts is set at 20 seconds. 
The restart attempt counter (1-5) is reset by any of the
following operation.
– Powering the drive down and back up again.
– Pressing the reset (stop) button on the drive keypad when
the drive is tripped (displaying a trip message).
– Removing and reapplying the hardware enable signal.
1100 Keypad mode restart function
These values apply only when the drive is running in keypad
mode, 1103=1 or 2.
Minimum speed, keypad start
1100=0
The ACS250 will automatically run at the minimum
programmed frequency (value entered into parameter 2007)
when started from the keypad, regardless of the speed it was
previously running at prior to a stop or power off condition
being applied. With minimum speed (2007) set to 0 the drive
will always restart with a set point speed of 0.
Previous operating speed, keypad start
1100=1
The ACS250 will automatically run at the previous speed set
point, prior to the stop condition being applied, when started
from the keypad. This applies both to the drive being stopped
and to the mains input power being removed (previous set
point is retained on power off). E.g. with the drive powered
off while running at 20 Hz, the next start after power on will
cause the drive to run immediately up to 20 Hz.
Minimum speed, terminal start
1100=2
With this mode the ACS250 uses the enable input (digital
input 1) as the start/stop reference to the drive rather than the
buttons on the keypad. The behavior of the enable input in
defined by parameter 2108.
Once enabled the ACS250 will automatically run at the
minimum programmed frequency (value entered into
parameter 2007) when started from the keypad, regardless of
the speed it was previously running at prior to a stop or power
off condition being applied. With minimum speed (2007) set to
0 the drive will always restart with a set point speed of 0.
Previous operating speed, terminal start
1100=3
With this mode the ACS250 uses the enable input (digital
input 1) as the start/stop reference to the drive rather than the
buttons on the keypad. The behavior of the enable input in
defined by parameter 2108.
Once enabled the ACS250 will automatically run at the
previous speed set point, prior to the stop condition being
applied, when started from the keypad. This applies both
to the drive being stopped and to the mains input power
being removed (previous set point is retained on power off).
For example, with the drive powered off while running at 20
Hz, the next start after power on will cause the drive to run
immediately up to 20 Hz.
For more information please
contact your local ABB
representative or visit:
www.abb.com/drives
© Copyright 2014 ABB. All rights
reserved. Specifications subject to
change without notice.