AKD 2800
Programming
Function:
In these parameters 302-307
Digital inputs
it is possible
to choose between the different enabled functions
related to the digital inputs (terminals 18-33).
Description of choice:
No operation
is selected if the frequency converter is
not to react to signals transmitted to the terminal.
Reset
resets the frequency converter after an
alarm; however, a few alarms cannot be reset
(trip locked) without first disconnecting the mains
supply and reconnecting it. See table under
List
of warnings and alarms
. Reset is activated on
the leading edge of the signal.
Coasting stop inverse
is used for making the frequency
converter "let go" of the motor immediately (output
transistors are "turned off"), which means that the motor
runs freely to stop. Logic
’
0
’
leads to coasting to stop.
Reset and coasting inverse
are used to activate
motor coast simultaneously with reset. Logical
’
0
’
means motor coast stop and reset. Reset
is activated on the falling edge.
Quick stop inverse
is used for activating the quick-stop
ramp down set in parameter 212
Quick stop
ramp-down time.
Logic
’
0
’
leads to quick stop.
DC-braking inverse
is used for stopping the motor by
energizing it with a DC voltage for a given time, see
parameters 126, 127 and 132
DC brake
. Please note
that this function is only active if the value in parameter
126
DC braking time
and 132
DC brake voltage
is
different from 0. Logic
’
0
’
leads to DC braking.
Stop inverse
, a logic
’
0
’
means that the motor speed
is ramped down to stop via the selected ramp.
None of the stop commands mentioned
above are to be used as repair switches.
Note that the frequency converter has more
voltage inputs than L1, L2 and L3 when the DC bus
terminals are used. Check that all voltage inputs are
disconnected and that the prescribed time (4 mins.)
has passed before repair work is commenced.
Start
is selected if a start/stop command is required.
Logic
’
1
’
= start, logic
’
0
’
= stop.
Latched start
, if a pulse is applied for min. 14 ms,
the frequency converter will start the motor, provided
no stop command has been given. The motor can
be stopped by briefly activating
Stop inverse
.
Reversing
: Not used in AKD.
Reversing and start
: Not used in AKD.
Start clockwise
is used if you want the motor shaft only
to be able to rotate clockwise when started. Should
not be used for
Process regulation, closed loop
.
Start anticlockwise
: Not used in AKD.
Jog
: Not used in AKD.
Freeze reference
freezes the present reference. The
reference can now only be changed via
Speed up
and
Speed down
. If
freeze reference
is active, it will be saved
after a stop command and in the event of mains failure.
Freeze output
freezes the present output frequency
(in Hz). The output frequency can now only be
changed via
Speed up
and
Speed down
.
NB!:
If
Freeze output
is active the frequency converter
can only be stopped if you select
Motor coast
,
Quick stop
or
DC braking
via a digital input.
Speed up
and
Speed down
are selected if digital
control of the up/down speed is required. This
function is only active if
Freeze reference
or
Freeze
output frequency
has been selected.
If
Speed up
is active the reference or output
frequency will be increased, and if
Speed down
is active the reference or output frequency will be
reduced. The output frequency is changed via
the preset ramp times of 3 sec.
One pulse (logic
’
1
’
minimum high for 14 ms
and a minimum break time of 14 ms) will lead
to a speed change of 0.1 % (reference) or 0.1
Hz (output frequency). Example:
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.H2.02 -
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