VLT
®
4000 VT
Programming
Pulses (logic "1" minimum high for 3 ms and a
mini-mum pause of 3 ms) will lead to a change of
speed of 0.1% (reference) or 0.1 Hz (output frequency).
Example:
Terminal
Terminal
Freeze ref./
(16)
(17)
Freeze output
No speed
change
0
0
1
Speed down
0
1
1
Speed up
1
0
1
Speed down
1
1
1
The speed reference frozen via the control
panel can be changed even if the VLT AFD has
stopped. In addition, the frozen reference will be
rememberd in case of a line failure.
Run permissive.
There must be an active start
signal via the terminal, where
Run permissive
has
been programmed, before a start command can be
accepted.
Run permissive
has a logic ‘AND
’
function
related to Start (terminal 18, parameter 302
Terminal
18, Digital input
), which means that in order to start
the motor, both conditions must be fulfilled. If
Run
permissive
is programmed on several terminals,
Run
permissive
must only be logic "1" on one of the
terminals for the function to be carried out.
Jog
is used to override the output frequency to the
frequency set in parameter 209
Jog frequency
and
issue a start command. If local reference is active, the
VLT AFD will always be in
Open loop
[0], regardless of
the selection made in parameter 100
Configuration
.
Jog is not active if a stop command has been
given via terminal 27.
Data change lock
is selected if data changes
to parameters are not to be made via the control
unit; however, it will still be possible to carry
out data changes via the bus.
Pulse reference
is selected if a pulse sequence
(frequency) is selected as a reference signal. 0 Hz
corresponds to Ref
MIN
, parameter 204
Minimum
reference, Ref
MIN
. The frequency set in parameter
327
Pulse reference, max. frequency
corresponds to
parameter 205
Maximum reference, Ref
MAX
.
Pulse feedback
is selected if a pulse sequence
(frequency) is selected as a feedback signal.
Parameter 328
Pulse feedback, max. frequency
is
where the maximum frequency for pulse feedback is set.
Hand start
is selected if the VLT AFD is to be controlled
by means of an external hand/off or H-O-A switch.
A logic ‘1
’
(Hand start active) will mean that the VLT
AFD starts the motor. A logic "0" means that the
connected motor stops. The VLT AFD will then be in
OFF/STOP mode, unless there is an active
Auto start
signal
. See also the description in
Local control
.
NOTE
An active Hand and Auto signal via the digital
inputs will have higher priority than the [HAND
START]-[AUTO START] control keys.
Auto start
is selected if the VLT AFD is to be controlled
via an external auto/off or H-O-A switch. A logic
’
1
’
will
place the VLT AFD in auto mode allowing a start signal
on the control terminals or the serial communication
port. If
Auto start
and
Hand start
are active at the
same time on the control terminals,
Auto start
will
have the highest priority. If
Auto start
and
Hand start
are not active, the connected motor will stop and
the VLT AFD will then be in OFF/STOP mode. See
also the description in
Local control
.
MG.40.A7.22 - VLT is a registered Danfoss trademark
85