Danfoss VLT AQUA High Power Operation Instructions Manual page 112

5 How to programme the frequency converter
[7] External Interlock
[8] Start
5
[9] Latched start
[10] Reversing
[11] Start reversing
[14] Jog
[15] Preset reference on
[16] Preset ref bit 0
[17] Preset ref bit 1
[18] Preset ref bit 2
[19] Freeze ref
[20] Freeze output
[21] Speed up
[22] Speed down
112
NB!
When the frequency converter is at the torque limit and has received a stop
command, it may not stop by itself. To ensure that the frequency converter stops,
configure a digital output to
output to a digital input that is configured as coast.
Same function as Coasting stop, inverse, but External Interlock generates the alarm message 'ex-
ternal fault' on the display when the terminal which is programmed for Coast Inverse is logic '0'.
The alarm message will also be active via digital outputs and relay outputs, if programmed for
External Interlock. The alarm can be reset using a digital input or the [RESET] key if the cause for
the External Interlock has been removed. A delay can be programmed in par. 22-00, External In-
terlock Time. After applying a signal to the input, the reaction described above will be delayed with
the time set in par. 22-00.
Select start for a start/stop command. Logic '1' = start, logic '0' = stop.
(Default Digital input 18)
Motor starts, if a pulse is applied for min. 2 ms. Motor stops when Stop inverse is activated
Changes direction of motor shaft rotation. Select Logic '1' to reverse. The reversing signal only
changes the direction of rotation. It does not activate the start function. Select both directions in
par. 4-10 Motor Speed Direction .
(Default Digital input 19).
Used for start/stop and for reversing on the same wire. Signals on start are not allowed at the same
time.
Used for activating jog speed. See par. 3-11.
(Default Digital input 29)
Used for shifting between external reference and preset reference. It is assumed that
preset [1] has been selected in par. 3-04. Logic '0' = external reference active; logic '1' = one of
the eight preset references is active.
Enables a choice between one of the eight preset references according to the table below.
Enables a choice between one of the eight preset references according to the table below.
Enables a choice between one of the eight preset references according to the table below.
Preset ref. bit
Preset ref. 0
Preset ref. 1
Preset ref. 2
Preset ref. 3
Preset ref. 4
Preset ref. 5
Preset ref. 6
Preset ref. 7
Freezes actual reference. The frozen reference is now the point of enable/condition for Speed up
and Speed down 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
Freezes actual motor frequency (Hz). The frozen motor frequency is now the point of enable/con-
dition for Speed up and Speed down 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
NB!
When Freeze output is active, the frequency converter cannot be stopped via a
low 'start [13]' signal. Stop the frequency converter via a terminal programmed
for Coasting inverse [2] or Coast and reset, inverse [3].
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 1in par. 3-41.
Same as Speed up [21].
®
MG.20.P3.02 - VLT is a registered Danfoss trademark
VLT AQUA High Power Operation Instructions
Torque limit & stop
[27] and connect this digital
2 1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
Maximum Reference
.
Motor Frequency
External/
0
0
1
0
1
0
1
0
1
.