5-00 Digital Input Mode
Set NPN or PNP mode for digital inputs 18, 19, 27 and 29. Digital
input mode.
Option: Function:
[1] NPN Action on negative directional
pulses (1). NPN systems are pulled
up to +24 V, internally in the
frequency converter.
3.6.2 5-1* Digital Inputs
Parameters for conguring 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
Description
[0] No operation No reaction to signals transmitted to
terminal.
[1] Reset Resets frequency converter after a TRIP/
ALARM. Trip lock alarms can be reset.
[2] Coast inverse Leaves compressor in free mode. Logic
0⇒coast stop.
[3] Coast and reset
inverse
Reset and coast stop inverted input (NC).
Leaves compressor in free mode and
resets the frequency converter. Logic
0⇒coast stop and reset.
[4] Quick Stop
inverse
Inverted input (NC). Generates a stop in
accordance with the quick stop ramp time
set in parameter 3-81 Quick Stop Ramp
Time. After ramping down, the shaft is in
free mode.
[5] DC-brake inverse Inverted input for DC braking (NC). Stops
compressor by energizing it with DC
current for a certain time period, see
parameter 2-01 DC Brake Current. The
function is only active when the value in
parameter 2-02 DC Braking Time is dierent
from 0. This selection is not possible when
parameter 1-10 Motor Construction is set to
[1] PM non-salient SPM.
[6] Stop inverse Stop inverted function. Generates stop
function when selected terminal goes
from logic 1 to 0 (not latched). Stop is
performed according to the selected ramp
time.
Digital input
function
Description
[7] External Interlock Same function as [2] Coasting stop, inverse,
but [7] External Interlock generates the
alarm message external fault on the
display when the terminal which is
programmed for [2] Coast inverse is logic
0. The alarm message is also active via
digital outputs and relay outputs, if
programmed for [7] External interlock. The
alarm can be reset using a digital input,
eldbus, 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 The compressor starts if a pulse is applied
for minimum 2 ms. The compressor stops
when [6] Stop inverse is activated.
[10] Reversing Change direction of compressor shaft
rotation. Reversing signal only changes
direction of rotation; it does not activate
the start function. Select [2] Both directions
in parameter 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 [8] start are not
allowed at the same time. 0=stop, 1=start
reversing.
[14] Jog Used for activating jog speed. See
parameter 3-11 Jog Speed [Hz]. (Default
digital input 29).
[16] Preset ref bit 0 Enables a selection between one of the 8
preset references according to Table 3.3.
[17] Preset ref bit 1 Enables a selection between one of the 8
preset references according to Table 3.3.
[18] Preset ref bit 2 Enables a selection between one of the 8
preset references according to Table 3.3.
[19] Freeze reference Freeze the actual reference. The frozen
reference is now the point of enable/
condition for [21] Speed up and [22] Speed
down to be used. If Speed up/down is
used, speed change always follows ramp 2
(parameter 3-51 Ramp 2 Ramp Up Time
and parameter 3-52 Ramp 2 Ramp Down
Time) in the range
parameter 3-02 Minimum Reference -
parameter 3-03 Maximum Reference.
[20] Freeze output Freezes actual reference. The frozen
reference is now the point of enable/
condition for [21] Speed up and [22] Speed
down to be used. If Speed up/down is
used, the speed change always follows
ramp 2.
Parameters
VLT
®
Compressor Drive CDS 803
28 Danfoss A/S © 06/2019 All rights reserved. MG18P202
33
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