Functions dedicated to only one digital input are stated in the associated parameter.
All digital inputs can be programmed to these functions:
[0]
No operation
No reaction to signals transmitted to terminal.
[1]
Reset
Resets adjustable frequency drive after a TRIP/ALARM. Not all alarms can be reset.
[2]
Coast inverse
Leaves motor in free mode. Logic ‘0’ => coasting stop.
(Default Digital input 27): Coasting stop, inverted input (NC).
[3]
Coast and reset inverse
Reset and coasting stop Inverted input (NC).
Leaves motor in free mode and resets the adjustable frequency drive. Logic ‘0’ => coasting stop
and reset.
[5]
DC brake inverse
Inverted input for DC braking (NC).
Stops motor by energizing it with a DC current for a certain time period. See par. 2-01 to par. 2-03.
The function is only active when the value in par. 2-02 is different from 0. Logic ’0’ => DC braking.
[6]
Stop inverse
Stop Inverted function. Generates a stop function when the selected terminal goes from logical level
‘1’ to ‘0’. The stop is performed according to the selected ramp time (par. 3-42 and par. 3-52).
NOTE!
When the adjustable frequency drive is at the torque limit and has received a
stop command, it may not stop by itself. To ensure that the adjustable frequency
drive stops, configure a digital output to
Torque limit & stop
[27] and connect
this digital output to a digital input that is configured as coast.
[7]
External Interlock
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.
[8]
Start
Select start for a start/stop command. Logic ‘1’ = start, logic ‘0’ = stop.
(Default Digital input 18)
[9]
Latched start
Motor starts, if a pulse is applied for min. 2 ms. Motor stops when Stop inverse is activated
[10]
Reversing
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).
[11]
Start reversing
Used for start/stop and for reversing on the same wire. Signals on start are not allowed at the same
time.
[14]
Jog
Used for activating jog speed. See par. 3-11.
(Default Digital input 29)
[15]
Preset reference on
Used for shifting between external reference and preset reference. It is assumed that
External/
preset
[1] has been selected in par. 3-04. Logic '0' = external reference active; logic '1' = one of
the eight preset references is active.
[16]
Preset ref bit 0
Enables a choice between one of the eight preset references according to the table below.
[17]
Preset ref bit 1
Enables a choice between one of the eight preset references according to the table below.
[18]
Preset ref bit 2
Enables a choice between one of the eight preset references according to the table below.
6 How to Program the Low Harmonic Drive
VLT AQUA Low Harmonic Drive Instruction
Manual
6-22
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
6
