All digital inputs can be programmed to these functions:
[0] No
operation
No reaction to signals transmitted to the
terminal.
[1] Reset Resets frequency converter after a TRIP/
ALARM. Not all alarms can be reset.
[2] Coast
inverse
(Default Digital input 27): Coasting stop,
inverted input (NC). The frequency converter
leaves the motor in free mode. Logic ‘0’ ⇒
coasting stop.
[3] Coast and
reset inverse
Reset and coasting stop Inverted input (NC).
Leaves motor in free mode and resets drive.
Logic ‘0’ ⇒ coasting stop and reset.
[4] Quick stop
inverse
Inverted input (NC). Generates a stop in
accordance with quick-stop ramp time set in
3-81 Quick Stop Ramp Time. When motor
stops, the shaft is in free mode. Logic ‘0’ ⇒
Quick-stop.
[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 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.
[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 [27]
Torque limit & stop and connect this
digital output to a digital input that is
configured as coast.
[8] Start (Default Digital input 18): Select start for a
start/stop command. Logic ‘1’ = start, logic ‘0’
= stop.
[9] Latched
start
The motor starts, if a pulse is applied for min.
2 ms. The motor stops when Stop inverse is
activated.
[10] Reversing (Default Digital input 19). Change the
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. The
function is not active in process closed loop.
[11] Start
reversing
Used for start/stop and for reversing on the
same wire. Signals on start are not allowed at
the same time.
[12] Enable start
forward
Rotates motor shaft clockwise at start.
[13] Enable start
reverse
Rotates motor shaft counterclockwise at start.
[14] Jog (Default Digital input 29): Use to activate jog
speed. See 3-11 Jog Speed [Hz].
[15] Preset
reference on
Shifts between external reference and preset
reference. It is assumed that [1] External/preset
has been selected in 3-04 Reference Function.
Logic '0' = external reference active; logic '1'
= one of the eight preset references is active.
[16] Preset ref bit
0
Preset ref. bit 0,1, and 2 enables a choice
between one of the eight preset references
according to Table 6.5.
[17] Preset ref bit
1
Same as Preset ref bit 0 [16].
[18] Preset ref bit
2
Same as Preset ref bit 0 [16].
Preset ref. bit 2 1 0
Preset ref. 0 0 0 0
Preset ref. 1 0 0 1
Preset ref. 2 0 1 0
Preset ref. 3 0 1 1
Preset ref. 4 1 0 0
Preset ref. 5 1 0 1
Preset ref. 6 1 1 0
Preset ref. 7 1 1 1
Table 6.5
[19]
Freeze
ref
Freezes the actual reference, which 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 (3-51 Ramp 2
Ramp Up Time and 3-52 Ramp 2 Ramp Down Time)
in the range 0 - 3-03 Maximum Reference.
[20] Freeze
output
Freezes the actual motor frequency (Hz), which 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
(3-51 Ramp 2 Ramp Up Time and 3-52 Ramp 2
Ramp Down Time) in the range 0 to 1-23 Motor
Frequency.
NOTE
When Freeze output is active, the frequency
converter cannot be stopped via a low [8]
start signal. Stop the frequency converter via
a terminal programmed for [2] Coasting
inverse or [3] Coast and reset, inverse.
[21] Speed
up
Select Speed up and Speed down if digital control
of the up/down speed is desired (motor potenti-
ometer). Activate this function by selecting either
Freeze reference or Freeze output. When Speed
Parameter Descriptions
Operating Instructions VLT
®
CDS302 and CDS303
MG34M302 - VLT
®
is a registered Danfoss trademark/Commercial Compressor 61
6
6
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