Preset ref. bit
2
1
0
Preset ref. 0
0
0
0
Preset ref. 1
0
0
1
Preset ref. 2
0
1
0
Preset ref. 3
0
1
1
Preset ref. 4
1
0
0
Preset ref. 5
1
0
1
Preset ref. 6
1
1
0
Preset ref. 7
1
1
1
[19]
Freeze ref
Freezes actual reference. The frozen reference is now the point of enable/condition for Speed up
and Slow to be used. If Speed up/down is used, the speed change always follows ramp 2 (par. 3-51
and 3-52) in the range 0 - par. 3-03
Maximum Reference
.
[20]
Freeze output
Freezes actual motor frequency (Hz). The frozen motor frequency is now the point of enable/con-
dition for Speed up and Slow to be used. If Speed up/down is used, the speed change always follows
ramp 2 (par. 3-51 and 3-52) in the range 0 - par. 1-23
Motor Frequency
.
NOTE!
When Freeze output is active, the adjustable frequency drive cannot be stopped
via a low ‘start [13]’ signal. Stop the adjustable frequency drive via a terminal
programmed for Coasting inverse [2] or Coast and reset, inverse [3].
[21]
Speed up
For digital control of the up/down speed is desired (motor potentiometer). Activate this function by
selecting either Freeze reference or Freeze output. When Speed up is activated for less than 400
msec., the resulting reference will be increased by 0.1%. If Speed up is activated for more than 400
msec., the resulting reference will ramp according to Ramp 1 in par. 3-41.
[22]
Slow
Same as Speed up [21].
[23]
Set-up select bit 0
Selects one of the four set-ups. Set par. 0-10
Active Set-up
to Multi Set-up.
[24]
Set-up select bit 1
Same as Set-up select bit 0 [23].
(Default Digital input 32)
[32]
Pulse input
Select Pulse input when using a pulse sequence as either reference or feedback. Scaling is done in
par. group 5-5*.
[34]
Ramp bit 0
Select which ramp to use. Logic “0” will select ramp 1 while logic “1” will select ramp 2.
[36]
Line failure inverse
Activates par. 14-10
Line Failure
. Line failure inverse is active in the Logic “0” situation.
[52]
Run Permissive
The input terminal, for which the Run permissive has been programmed must be logic “1” before a
start command can be accepted. Run permissive has a logic ‘AND’ function related to the terminal
which is programmed for
START
[8],
Jog
[14] or
Freeze Output
[20], which means that in order to
start running the motor, both conditions must be fulfilled. If Run Permissive is programmed on
multiple terminals, Run permissive needs only be logic ‘1’ on one of the terminals for the function
to be carried out. The digital output signal for Run Request (
Start
[8],
Jog
[14] or
Freeze output
[20]) programmed in par. 5-3* Digital outputs, or par. 5-4* Relays, will not be affected by Run
Permissive.
[53]
Hand start
A signal applied will put the adjustable frequency drive into hand mode as if button
Hand On
on the
LCP has been pressed and a normal stop command will be overridden. If disconnecting the signal,
the motor will stop. To make any other start commands valid, another digital input must be assigned
to Auto-Start and a signal applied to this. The
Hand On
and
Auto On
buttons on the LCP has no
impact. The
Off
button on the LCP will override
Hand Start
and
Auto-Start
. Press either the
Hand
On
or
Auto On
button to make
Hand Start
and
Auto-Start
active again. If no signal on neither Hand
Start nor Auto-Start, the motor will stop regardless of any normal Start command applied. If signal
applied to both Hand Start and Auto-Start, the function will be Auto-Start. If pressing the
Off
button
on the LCP, the motor will stop regardless of signals on
Hand Start
and
Auto-Start
.
[54]
Auto-start
A signal applied will put the adjustable frequency drive into auto mode as if the LCP button
Auto
On
has been pressed. See also
Hand Start
[53]
VLT AQUA Low Harmonic Drive Instruction
Manual
6 How to Program the Low Harmonic Drive
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
6-23
6
