Main Menu - Digital In/Out - Group; Digital I/O Mode; Digital Inputs - Danfoss VLT HVAC Basic Drive Programming Manual

Parameters

3.6 Main Menu - Digital In/Out - Group 5

3.6.1 5-0* Digital I/O Mode

Parameters for configuring the input and output using NPN
and PNP.
These parameters cannot be adjusted while the motor is
running.
5-00 Digital Input Mode
Option: Function:
Set NPN or PNP mode for digital inputs 18,19 and 27.
Digital Input Mode
[0] PNP Action on positive directional pulses (0). PNP systems
*
are pulled down to GND.
[1] NPN Action on negative directional pulses (1). NPN systems
are pulled up to +24V, internally in the frequency
converter.
5-03 Digital Input 29 Mode
Option:
[0] PNP
*
[1] NPN

3.6.2 5-1* Digital Inputs

Parameters for configuring the input functions for the input
terminals.
The digital inputs are used for selecting various functions in
the frequency converter. All digital inputs can be set to the
following functions:
Digital input function Desciption
[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 Reset and coasting stop inverted input
inverse (NC). Leaves motor in free mode and resets
the frequency converter. Logic '0' =>
coasting stop and reset.
[4] Quick Stop inverse Inverted input (NC). Generates a stop in
accordance with the quick-stop ramp time
set in 3-81 Quick Stop Ramp Time. When
motor stops, shaft is in free mode.
VLT HVAC Basic Drive Programming Guide
Function:
®
MG.18.B1.02 - VLT is a registered Danfoss trademark
[5] DC-brake inverse Inverted input for DC braking (NC). Stops
motor by energising it with DC current for a
certain time period, see 2-01 DC Brake
Current. Function is only active when value
in 2-02 DC Braking Time is different from 0.
[6] Stop inverse Stop inverted function. Generates stop
function when selected terminal goes from
logical level "1" to "0" (not latched). Stop is
performed according to selected ramp
time.
[7] External Interlock Same function as Coasting stop, inverse,
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
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.
*[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.
2ms. Motor stops when Stop inverse is
activated.
[10] Reversing Change direction of motor shaft rotation.
Reversing signal only changes direction of
rotation; it does not activate start function.
Select Both directions [2] in 4-10 Motor
Speed Direction. 0 = normal, 1 = reversing.
[11] Start reversing Use for start/stop and for reversing at the
same time. Signals on start [8] are not
allowed at the same time. 0 = stop, 1 = start
reversing.
[14] Jog Used for activating jog speed. See 3-11 Jog
Speed [Hz]. (Default Digital input 29)
[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 Table 3.1.
[19] Freeze reference Freeze 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, speed
change always follows ramp 2 (3-51 Ramp 2
Ramp up Time and 3-52 Ramp 2 Ramp down
Time) in the range 3-02 Minimum Reference -
3-03 Maximum Reference.
3 3
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