Danfoss VLT Series Programming Manual page 64

Parameter Description
3.7.3 5-1* Digital Inputs continued
All = Terminals 18, 19, 27, 29, 32, 33, X30/2, X30/3, X30/4.
X30/ are the terminals on MCB 101.
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 frequency converter 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 and coasting stop Inverted input
reset inverse (NC).
Leaves motor in free mode and resets the
frequency converter. Logic '0' => coasting
stop and reset.
[5] DC-brake Inverted input for DC braking (NC).
inverse Stops motor by energizing it with a DC
current for a certain time period. See
2-01 DC Brake Current to 2-03 DC Brake Cut
In Speed [RPM]. The function is only active
when the value in 2-02 DC Braking Time is
different from 0. Logic '0' => DC braking.
This selection is not possible when
1-10 Motor Construction is set to [1] PM non
salient SPM.
[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 (3-42 Ramp 1 Ramp Down Time,
3-52 Ramp 2 Ramp Down Time, 3-62 Ramp 3
Ramp down Time, 3-72 Ramp 4 Ramp Down
Time).
NOTE
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
Torque limit & stop [27] and connect
this digital output to a digital input
that is configured as coast.
[7] External Same function as Coasting stop, inverse,
Interlock but External Interlock generates the alarm
message 'external 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
®
VLT HVAC Drive Programming Guide
[8]
[9]
[10] Reversing
[11] Start reversing Used for start/stop and for reversing on the
[14] Jog
[15] Preset
[16] Preset ref bit 0 Enables a choice between one of the eight
[17] Preset ref bit 1 Enables a choice between one of the eight
[18] Preset ref bit 2 Enables a choice between one of the eight
[19] Freeze ref
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
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 22-00 External Interlock
Delay, External Interlock Time. After
applying a signal to the input, the reaction
described above will be delayed with the
time set in 22-00 External Interlock Delay.
Start Select start for a start/stop command. Logic
'1' = start, logic '0' = stop.
(Default Digital input 18)
Latched start 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
4-10 Motor Speed Direction.
(Default Digital input 19).
same wire. Signals on start are not allowed
at the same time.
Used for activating jog speed. See 3-11 Jog
Speed [Hz].
(Default Digital input 29)
Used for shifting between external
reference on reference and preset reference. It is
assumed that External/preset [1] has been
selected in 3-04 Reference Function. Logic '0'
= external reference active; logic '1' = one
of the eight preset references is active.
preset references according to the table
below.
preset references according to the table
below.
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/
3
2 1 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
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